High Idle When Starting Car

On may 21, 2005 the car failed to start. 1000 is on the high side, and 1700 is certainly on the high side for cold start up. It's easy to tell when your car has a rough idle: When you start the engine, it won't run at a steady rate. I have no vacuum leakes anywhere. sub-zero) climate starting conditions. I doubt the timing chain (all the engines used in the '01 Grand Am were timing chain driven) would cause the high idle. This will also happen if the idle becomes stuck or the oxygen meter indicates it needs to adjust the oxygen-fuel mix. Many DIYers immediately replace the idle air control valve. I'm waiting until the end of the month to switch the insurance from one car to the other. comThe typical problem that the woman could experience when pregnant is really a miscarriage, especially if she is a first-time mother. Once a couple of litres have been burnt off, the space is too great for a vacuum to occur. A very small change in any one of the various engine components can have a big effect on the way the car idles and drives. The high idle isn't necessarily a product of the outside temp, but part of the programming of the car to warm the cats up to get them to operating temperature ASAP to reduce emissions. I used to hear people say it's cheaper to leave lights on when you leave a room if you are coming back soon because turning them on and off takes more energy. Still goes a bit high when i first put the clutch in but, up say 50 to 150 rpm but aparently thats normal. Cars have a "fast idle" mechanism: this idles the engine faster when cold. My car was idling high, around 1000/1100 rpm then after doing the relearn it has gone down to 800 (on the cluster not measuring with any plug in stuff). When it would idle it would pulse between around 900 and 1200 RPMs. the idle is supposed to be higher upon start-up, particularly on cold starts (and this time of year it is quite cold). I'm bothered with the rough idle when the engine is cold. Some causes are harmless, while others can indicate the need for a repair. Let the car idle for 5 minutes. When starting in the RFDS B200's we place the condition lever to low idle. Next attempt at starting I pumped the throttle. Once the test is finished, the engine rpm will drop, or just let it idle for 7-8 mins. thats when it went to +1 at idle and +6 on I turn headlights and I will try that high tech generator check thanks. After sitting overnight or a few days my 1999 Camry le 4 cylinder Automatic has trouble holding an idle. High Engine Idle So, What can cause abnormally high engine idle speeds. I might get more requests about idle issues than any other topic. i would check your fast idle valve and clean it. 4GHz Wireless Car Mouse Ultra Small Optical Mouse Mini Office Mice for PC Computer Laptop Gift (Red): Mice - Amazon. 2007 Ford focus 2. it seems to idle about 600 rpm and just runs normal and just once in a while it drops. 2 liter Envoy with 60,000 miles on it. All with no throttle twist. High Idle when starting car from COLD start. The Two front barrels opened up slightly and i was getting 14. The symptoms include stalling when coming to a stop, or very low idle after starting, or stalling if the throttle is "blipped" (opened and closed quickly). For 2014, the EX series will be renamed QX50, in line with Ininfiit's new naming conventions. Then setup scanner and from a cold start, idle the car from cold to about 200F ECT. When i first start the engine from cold everything seems fine when the car is at idle, nothing out of the ordinary happening. This is a general guide which will list symptoms for 944 starting and running problems and common causes of those problems. I reseated both my ECU connectors. Idle speed (or idle) is the rotational speed an engine runs at when the engine is idling, that is, when the engine is uncoupled from the drivetrain and the throttle pedal is not depressed. You can find no pills to take Guarantee Loans 800 or formulas to combine. rpm idle goes on between past 1 to high. After sitting overnight or a few days my 1999 Camry le 4 cylinder Automatic has trouble holding an idle. It is intended to help you map out a troubleshooting plan. I might get more requests about idle issues than any other topic. Whenever the car would idle up, the IAC was high. hope it helps. For 2014, the EX series will be renamed QX50, in line with Ininfiit's new naming conventions. Idle Rough and RPM High Causes. It will fluctuate slightly for 5 minutes after it settles while the ECU preforms a test. When cold, or sitting overnight only, vehicle starts up fine, however has rough idle, loud exhaust vibration sounds in interior, is worse in reverse backing out of driveway. It has been around low 30's in the morning going to work and upper 40's in the afternoon going home from work. Started to idle high at 2000 to 3000. other times it will occilate between 1300 and 2000. In other words, adjust the PWM current limit before taking the car out on the street where injector pulse widths become high. I'm just looking to get my high idle back which is hilarious because most people on here are trying to get rid of their ridiculously high cold start idle!. Sometimes, it goes to 1km rpm and goes back to 2k rpm. To your question on letting the car warm up before taking off, I start the car, let it idle for 30 seconds or so, then pull away and drive at a modest pace for the first 1/2 mile or so. I am not sure why it restarts the high rpm process if the car has already been warmed up, just doesnt make any sense to me at all. This reduces the warm-up time, which is a time that the engine produces high emissions. Now the engine begins to die, because the engine idle memory is now gone. I fixed the irratic idle surge this way. The idle is always rough. It usually settles between 1. The engine's idle speed also changes, based on outside conditions. Comments: So I have this issue, the car is a 1987 325es, the car runs fine but it wahs high idle when the car's lights are off when I turn on all the lights and the fog lights the car becomes stable on the idle. I have no vacuum leakes anywhere. Not sure if related. I've never owned an Impala or a car with the 3800 Buick engine before so I don't have any experience to compare it with. The 2nd part is that it needs to maintain a high idle for a couple of minutes to warm the catalytic converter. High Idle At Start Up. (The location of the MAP sensor and its appearance depends on the vehicle; these instructions are for a LeBaron GTS. If it's not severely cold out and you're using high quality, clean 15W-40 engine oil or 10W-30 below 70 deg. The troubleshooting procedure for high and low idle conditions are similar, which are included in the following: Difficulty Scale: 4 of 10 Step 1 - If the check engine or service engine light soon has illuminated retrieving the diagnostic trouble codes could lead you in the right direction of what the problem is, or is related too. chevy 350 high idle hi i have a chevy 350 in my 72 chevelle engine has been overhauled but the idle is too high like around 2000 to 3000. A cold start is the first start of the day or after its sat for a while. Bought a new battery and replaced alternator. The high idle isn't necessarily a product of the outside temp, but part of the programming of the car to warm the cats up to get them to operating temperature ASAP to reduce emissions. IF there is contaminate in the fuel tank large enough to block the pick up screen, you have really problems with where you are buying your fuel. To start the car, the driver only has to step on. when the engine's hot there's no need to idle it as fast. Hoping to get some ideas here. I have a 2004 GMC 4. if your check engine light is on please scan and determine fault codes first). However my problem now is that the high idle will not cut back down to normal idle. If the car is moving while this happens, it can be quite dangerous because the hesitation can be inconsistent and unpredictable. The only way I could get the code off was to turn the idle screw down to lower RPM (I know you should not do this), this took care of the problem but my idle. It will then idle at 1,800 rpm for another whole minute or so, and then slowly start to drop off to 1,600 etc until it reaches about 1,300 rpm after about two full minutes. When i first start the engine from cold everything seems fine when the car is at idle, nothing out of the ordinary happening. High Idle 13 Answers. Once the test is finished, the engine rpm will drop, or just let it idle for 7-8 mins. i have not had a chance to get pressure readings yet. High revs when coasting A few months back my car kept cutting out whilst coasting. The fact that it happens on the first start up of the day makes sense (as it generally has sat for longer than any other period in a normal day @12+ hours). Is everyone seeing this or should I have it checked out? BTW, I live in Florida so it's not cold. As the idle fell, IAC would go down. Both of these complaints are generally caused by a problem with cold start enrichment. My car idles very high when i first start it up and after a few minutes it will idle down but not much intell i put it into gear. Some causes are harmless, while others can indicate the need for a repair. Anyway to clarify. If it hunts like that it could be a lot of things but most common would be. If its warm, it starts to idle (600 rpm's), cold it starts in a higher idle (1200 rpm's) and drops down gradually, when real cold it starts at a very high idle (2000 rpm's) and gradually goes down as the car warms up. If the car starts when cold but, idles rough or does not want to stay running, this can indicate a problem with the engine. On March 29, 2005 the brakes locked up. High idles are usually used in cold (i. Car surges,idle goes very low and almost stalls when coming to a stop. This reduces the warm-up time, which is a time that the engine produces high emissions. Runs great as mentioned. You sure the car usually idles at 900rpm cold? My mother's 98 Camry 4cyl idles in the mid 1k range after a cold start. High idle, then rough low idle, rpm jump and then dies. Re: super high idle at startup on my quadrajet help « Reply #2 on: August 25, 2012, 12:38:44 PM » sounds like the secondaries are open, wait til the engine is cold (overnight) then set the choke from scratch, open the buterflies to see if the throttle plates are open or closed, then turn down the high idle screw under the choke pull off, set. It must be something further down the evap since I definitely isolated it there. Of course, all vehicles will idle high when cold. I'm always hitting high idle RPMs (1400-1500) when starting the car in the morning, then after about a minute it's down to typical 750-800. You can try cleaning it and see if that improves your idle speed. What are any typical trains of thought to debug whether it could be the battery, alternator or something else?. Or could be the chip has it programmed that way. A high idle when cold warms your engine more quickly, to get it into closed loop more quickly for fuel economy. When I start my car it will run at 1500 rpm and then idle at 1000 rpm. i can see the compressor spinning and it does not stop, so its not the compressor kicking on and off. Idle Speed is high coz when i put clutch to shift gears car sound high in acceleration and RPM 2. It is intended to help you map out a troubleshooting plan. By the time I get to work (30 min drive) and pull into the parking lot, it will idle at around 750 - 800 RPM. Idle Stop-start systems (also called "Idle Stop") that automatically shut the engine off when the vehicle stops moving to save fuel, and then automatically restarts the engine when the driver presses down on the accelerator pedal are becoming more and more common on late model vehicles. when I start my car it has a high idle. I'd guess about 1800-2000 RPM, but without a tach it is hard to tell. Even PROM TSB numbers does this. How to repair high idle speed issue in car engine. It'll also cause your start condition to be leaner than it is supposed to be. Bought a new battery and replaced alternator. 4 16v is revving high when idle. I've checked all the typical places where vacuum hoses would leak, and I replaced the IAC valve per my mechanics advice. but you say it goes to normal after awhile. Start monkeying with the controller circuit board. but when they do go, boy do. The only way I could get the code off was to turn the idle screw down to lower RPM (I know you should not do this), this took care of the problem but my idle. Thanks Steve, for that draft of the dissertation on how to fix idle/stumble. On previous occasions the car would all by itself rise the idle to 1. If you are too rich use lower number in the fuel idle cells. Shop our curated array of f idle and much more on sale today. Did your car used to idle significantly better than it is now? Do you start the car in the morning and the RPMs do a dance before the car finally settles down? The car might even stall if you don’t put your foot on the gas for a few seconds. Power loss at highway speeds. Nowadays it would be all on a single chip. you can hear the valve on the motor clicking Car Problem Resources. It would start, but I needed to keep the throttle partially down to get it to stay running. IF you take it out of gear, the idle will hold at 2500 until the car comes to a stop where it returns to 1300. i have a 2003 toyota corolla. High RPM when car start in morning. When its level goes lower than the acceptable level, you will face the issue of car air conditioner not blowing cold air when idling. High Idle At Start Up. Once I did, it dropped down to "close to normal idle". so we decide to start the car and wiggle the tps wires and sure enough the car would idle rough. I might have stumbled over a fix but I will continue to monitor it. However, as I view the RPM gauge, the RPMs begin to slowly decrease so that after about 5 minutes, its normal RPM at idle ( 750-1000 ). There's a reason why the car starts up with a high idle. You sure the car usually idles at 900rpm cold? My mother's 98 Camry 4cyl idles in the mid 1k range after a cold start. A parked car should neither idle high nor consistently rev up when it is running and parked. In other words, adjust the PWM current limit before taking the car out on the street where injector pulse widths become high. The abs actuator was replaced. Rough Idle When Starting Cold, Then Goes Away When Engine Is At Operating Temperature More Details Below I have an older, low mileage vehicle with a V8 engine. Turn off the AC and Fans (via VCM controls). when i restart my civic's engine when it's hot it idles high for 2-3 seconds (initialization) then drops like a rock under 1000 rpm. The idle is always rough. take some ether and start the engine spray the ether around the gasket joints and the rubber lines. Anyway to clarify. Yeah I just did that last night on my car as a matter of fact. Every vehicle I recall owning, when started in the winter, would idle a little high till it had ran for 30-60 seconds. sometimes it will go up to 2500rpm and idle, after a minute or so, it jumps down to 1000 and occilates between 1000 and 1500. Appslatestdownload. It also cranks a bit more than usual sometimes. The thing I do every morning is I get up, brush my teeth, go get dressed, get a cup of milk, go start the car, set the turbo timer for 9 minutes, then go do my hair and finish drinking my milk. it seems to idle about 600 rpm and just runs normal and just once in a while it drops. i could be literally crawling in traffic at 5mph and as soon as i put the clutch down it could stall. High rev and RPM idle after start hey guys, tell me what you think about this. When it stalls the Rev sweep does not happen Now I got the habit of giving. when the engine's hot there's no need to idle it as fast. My car was having problems with high idle and the speedometer would only work once in a while. By that time usually the stock gauge is fully warm, but I still wait until I get two lights down before I start going into any kind of boost. High engine idle is normal in the morning or anytime u start the car from cold start. Allow the car to slow to idle, and then repeat two more times. I'm always hitting high idle RPMs (1400-1500) when starting the car in the morning, then after about a minute it's down to typical 750-800. The fact that it happens on the first start up of the day makes sense (as it generally has sat for longer than any other period in a normal day @12+ hours). Once the test is finished, the engine rpm will drop, or just let it idle for 7-8 mins. [Response:] I've had a starting problem with my 89 744GL, and discovered that the 'neutral safety switch' was the culprit. if it is leaking the rpm will jump slightly. A high idle in your car can cause you to worry. Any time I start it up there is a high pitched whine, like a bearing going bad, coming from under the hood which lasts about 20 seconds then slows and stops like an electric motor with a bad bearing has been shut off. it seems to idle about 600 rpm and just runs normal and just once in a while it drops. Now the car is at the authorized service, also 60,000 km service is due. All Done! 9. What can cause of high RPM but car does not accelerate? when u first start the car it will idle high, around 1. 2000-3000 rpms when car is in park or neutral!!! Yea once I start'er up the rpm's go to somewhere between 2-3000 just sitting there in park and/or - if/when I shift into neutral. I doubt the timing chain (all the engines used in the '01 Grand Am were timing chain driven) would cause the high idle. A clogged catalytic converter may also cause stalling or lack of power when accelerating. It looks like it's due to the RPM dropping very low, and if I give it gas in the first second it is able to overcome that initial drop and go on to maintain 200-1000 idle RPM and doesn't turn off. If starting fluid makes it fire for a moment, or even start, a lean idle mixture is very likely. My 1995 Buick Century idles too high after I start the car. It has been around low 30's in the morning going to work and upper 40's in the afternoon going home from work. It is running around 1300RPM in neutral. edit: this is in Southern California so it isn't as if these are freezing. I have been reading that after a routine cleanup of this part, it may be necessary to make the CPU "re-learn" the correct RPM by clearing codes and engine on/off, accelerator pedal in-out routine. After that the car wouldn't idle. it has a 600 cfm edelbrock carb but when i adjust the idle screw down the engine shuts off. The starting problem would only occur when my daughter was driving the car -- and when she was at least 10 miles or more away from home. Browse F Idle available for purchase today on the internet. A high idle in your car can cause you to worry. For example you can have yours set at 20 even though you idle at 27 or so. Now the car idles at 2. ontop of the higher idle the start-up tune will also be pumping in more fuel than normal to prevent stalling as well as aiding the. Started the car and still had high idle and hanging rpm. You probably won't hurt it, either -- these are discrete linear components, pretty heavy-duty. Download Airplane Pilot Car Transporter Apps Latest Version for PC,Laptop,Windows. Ultimately, there is no reason to freak out when you see your car with a high RPM as soon as you start your vehicle in cold weather. When i start the engine both on CNG and Petrol, it takes longer to engine to stablize the RPM and come to Normal Idle Speed. rpm idle goes on between past 1 to high. Then setup scanner and from a cold start, idle the car from cold to about 200F ECT. The causes might vary, but most idle problems are caused by a mixture issue. Recently changed my battery and alternator. 2007 Ford focus 2. A rough idle/misfire usually starts out as being merely a nuisance, but if the causes are not identified and corrected, it may result in your engine not starting, or stopping altogether when you least expect it. soon as I start it it goes to normal idle. I'm bothered with the rough idle when the engine is cold. However, the high idle when the car is already warm sounds like a problem. Buy CHUYI Cool Sport Car Shaped Mouse 2. Power loss at highway speeds. I have to hold the gas down for a while until the car warms up and then its fine. Sometimes, it goes to 1km rpm and goes back to 2k rpm. When its started up in the morning its fine but as soon as I drive it the high revving starts. The thing I do every morning is I get up, brush my teeth, go get dressed, get a cup of milk, go start the car, set the turbo timer for 9 minutes, then go do my hair and finish drinking my milk. The high idle isn't necessarily a product of the outside temp, but part of the programming of the car to warm the cats up to get them to operating temperature ASAP to reduce emissions. To start the car, the driver only has to step on. Solving Holley Sniper High Idle Issues. Is this an appropriate cold idle speed for a manual trans 1. I am not sure why it restarts the high rpm process if the car has already been warmed up, just doesnt make any sense to me at all. My car does this. when the engine's hot there's no need to idle it as fast. The difference is, when cold, the idle will start at 1300 and, as soon as you start moving over 1mph, the idle speed goes to 2500. rpm idle goes on between past 1 to high. Pretty sure its normal. It'll rev around 1200 RPM, instead of the normal 800RPM idle if I start it after it had recently been turned off for a short period. Focus 2001: high idle on cold start? For the past few years, I've had a high idle on a cold start and so I always decide to wait a few minutes (it usually takes about 3 minutes) for it to "idle down" to what I think used to be the normal idle on a cold start. High rev on start once warms rough idle feels like it want to stall if I turn the a/c on idles fine. It connects to the car's electronic control unit, allowing it to make the necessary adjustments for a more efficient, safer, and smoother idle speed. My old car was a 1998 pontiac sunfire (also GM) and I had an idling problem as well. Tires are brand new. My 2005 Renault Megane 1. However when you remove that How To Get A Loan For A Business Start Up will, the depths of the mind says, "Ah, this individual desires to be rich. Start the engine and adjust the idle on the throttle bodies (if you can't get the idle down to normal you've REALLY got an air leak or the ISCV is totaly jammed) Reconnect the TPS and the ISCV one at a time, if either of these causes the idle to bounce up, there's your problem. sub-zero) climate starting conditions. Below are the top 5 symptoms of a bad idle air control valve which you will easily notice. 96 Ford Ranger 6cyl 3. Recently my car has started to idle roughly and stutter for the first 1-5 minutes depending on how cold it is and how cold it is outside. Dirty injectors Bad plugs / Coil / Leads / Coil pack Dirty fuel o2 Sensor Throttle position sensor If you are doing your own maintenance run the fuel down to 1/8 tank and. idle high - Husband replaced a rubber washer missing in the fuel injector. As the idle fell, IAC would go down. Once i start driving though, and get the engine upto temperature and stop at say traffic lights, junction etc, the revs seem to go mad, as if ive got my foot hard on the accelerator. In most cars the starter motor is employed to start the engine, just as it would when you turn the key. rpm idle goes on between past 1 to high. By disengaging, the engine is switched off immediately and the "Start Stop" appears on the display of the multifunction display. It will fluctuate slightly for 5 minutes after it settles while the ECU preforms a test. A car will boost to a higher revolution in park if the idle is set improperly or there is a leak. Anyway to clarify. So the (restated) problem is the following: If I start the engine when cold the engine starts and stays in failsafe mode (not just during the warm up period which is normal, but always) with rough idle. Car runs great after that but I will say that even after warmed up there is still a slight fluctuation in idle rpms when at a light etc If I go for a drive and then come home , shut car off and then an hour later start it back up the same thing happens. Ive read letting a new/rebuilt engine with flat tappet cam high idle too long on cold start is not good. I have a the newer 3. To make matters worse, the car wouldn't act up for me. i have not had a chance to get pressure readings yet. It usually settles between 1. idle high - Husband replaced a rubber washer missing in the fuel injector. When its level goes lower than the acceptable level, you will face the issue of car air conditioner not blowing cold air when idling. A new small battery was installed. The engine will idle up, and then settle around 1100 rpm. You sure the car usually idles at 900rpm cold? My mother's 98 Camry 4cyl idles in the mid 1k range after a cold start. In return if your idle is set too high, it will also lower your cold start idle obviously. I quizzed her about her starting technique. It revs at 2k rpm. The idle is always rough. If your car stalls at idle, one of the possible causes is a problem in the idle air control actuator. well - after having the plugs, wires, and intake cleaned it runs better but still has the erratic idle at startup - until you blip the throttle a couple of times. i have a 2001 dts 78,000 miles serviced regularly at dealership, noticed lately idle is low at start up sometimes, within a month car refused to start twice because idle was at about 400 to 500. A drop in fuel mileage is a sign of a clogging engine filter. This high rpm is seen before the A/C is turned on by the auto climate. This has got to be a computer problem I'm going to change the ecm one proble does not fix itself start another one and be three TPS's no DAMM way. about 5 starts ago, I noticed that the engine jumps up to 2K, then idles around 1100-1200. The fact that it happens on the first start up of the day makes sense (as it generally has sat for longer than any other period in a normal day @12+ hours). My 1995 Buick Century idles too high after I start the car. If you are too lean use higher number in the fuel idle cells. Tour Start here for a quick overview of the site Dell PowerEdge R220 fan speed high when idle, low under stress Is this car delivery via Ebay Motors on. Or could be the chip has it programmed that way. I fixed the irratic idle surge this way. I know when idle it should be about 100 so why is it going as high as this?. cant get to idle correctly. Discussion of Infiniti's amazing (and underrated) sport-luxury crossovers, the EX35 and EX37. OH the high idle went away When it runs it idles great like new. When I turn the car off and start it back up and don't turn the AC on at all, everything is 100%. " so does high idle mean that RPM is greater than 600-1000 RPM when foot is off the gas pedal. My Honda CRX had a cold idle of 3,000+ rpm; I almost took it back to the dealership, before I read the info on the emissions sticker under the hood - said 3k~3. A cold start just doesnt mean "When its cold outside". When it stalls the Rev sweep does not happen Now I got the habit of giving. sometimes rpm's come down on their own & sometimes not, so I turn the vehicle off. Ultimately, there is no reason to freak out when you see your car with a high RPM as soon as you start your vehicle in cold weather. There is no cold idle control from the ecu, so it doesn't start higher and drop as it warms up. Rough Idle. For 2014, the EX series will be renamed QX50, in line with Ininfiit's new naming conventions. Also cold idle and start up idle and many other factors vary with make, model and type of engine, smaller engines in most cases need a high start up idle. take some ether and start the engine spray the ether around the gasket joints and the rubber lines. The miss usually follows engine speed and may be more pronounced when the engine is under load. It would usually idle around 1200 to 1400 rpms and slow down after a brief time period. If your car stalls at idle, one of the possible causes is a problem in the idle air control actuator. Car model: Pontiac vibe 2004 Thank you. However, as I view the RPM gauge, the RPMs begin to slowly decrease so that after about 5 minutes, its normal RPM at idle ( 750-1000 ). I can get it to go back to near normal by un-rolling. Let the car idle for 5 minutes. I have a the newer 3. I used to hear people say it's cheaper to leave lights on when you leave a room if you are coming back soon because turning them on and off takes more energy. It's easy to tell when your car has a rough idle: When you start the engine, it won't run at a steady rate. Start the car and begin scanning. Cars have a "fast idle" mechanism: this idles the engine faster when cold. Noticed I could literary take my foot of the gas pedal when doing 40 or 50 and it would not slow down. Car surges,idle goes very low and almost stalls when coming to a stop. This is a general guide which will list symptoms for 944 starting and running problems and common causes of those problems. Ultimately, there is no reason to freak out when you see your car with a high RPM as soon as you start your vehicle in cold weather. my car idels fine usually but when stuck in traffic for a longer while and am constantly stoping n moving in this slow traffic the idle goes crazy and idles at about 1500-2000, but then when i drive it and gets some air it idles fine. Like previously stated before, High idle is very normal. Or could be the chip has it programmed that way. Of course, all vehicles will idle high when cold. sometimes rpm's come down on their own & sometimes not, so I turn the vehicle off. A cold start is the first start of the day or after its sat for a while. 4L Auto with close to 1700 miles on it nowbone stock. I have no vacuum leakes anywhere. Hello! 2007 civic coupe, automatic. Sometimes car starts w/high idle (1999 Isuzu Rodeo) When starting vehicle it starts w/high rpm. On a 1991 Nissan maxima Idle is good at starting car then the idle goes up high for a while then is up and down? A faulty camshaft can cause your 1991 Nissan Maxima to idle erratically. It would start, but I needed to keep the throttle partially down to get it to stay running.