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So I have a 2004 Aveo LS and recently it has started to randomly idle higher than normal at around 1900-2200 rpm. I am not sure what would cause this. The first time it happened I cut it off and back on and it stopped but when I tried doing that the other day it kept idling high. Any help would be greatly appreciated!!
Your engine will increase rpm for A/C use and heavy power steering use. Its not happening during that time is it?
Do you have a check engine light?
If not I'd try spraying some carb cleaner in the throttle body to clean up the IAC valve to see if its sticking.
I don't use the AC because I am stingy with my fuel, and I don't think its heavy power steering use so I will try some carb cleaner and see if it helps. I will keep you posted.
you might also need a temp sensor, it could be kicking it into high idle thinking its cold (warm up).
So on the way home from work yesterday I saw it idling at 3000 rpm at one point so I swung through Advance Auto Parts and picked up some carb cleaner. While I was spraying the cleaner and shortly after it didn't seem to have done anything. Later that evening my idle returned back to normal and stayed normal on my way into work today. So it appears as though the carb cleaner fixed it!
Thanks
Great to hear. :)
So I don't know if I am just imagining things but I feel as though my tachometer is laggy, has anyone else noticed that?
Problem Solved!!! -Aveo 2008 BIG Automatic-
First of all I'm Happy that you solved the issue with some carb. cleaner through the air valve. I had the same issue but carb. cleaner didn't do the job. Also I tried removing and cleaning the whole throttle body (completely) but that didn't work either. turning open the Idle Stop Screw helped the issue temporarily.
My high rev symptoms were:
1. High revs in neutral (1500 - 2100).
2. Higher rev. when changing gears than usual (about 1000 to 1500 higher than usual).
3. Engine check light went on occasionally (Fault P0122 - Throttle pedal position sensor / Switch "A" Circuit low input).
4. High revs were absolutely random; engine could work fine for a week and then go "crazy" for a few days.
And finally the solution... while the car was high reving (1500 to 2000 in neutral instead of 670rpm) I pulled out the TPS (Throttle Position Sensor) plug out and found that it solved the problem; the revs dropped down to normal ~670rpm while the engines computer used default signal values (the engine check light went on as well - checked it with an app and a bluetooth obdII device and it said P0122).
What I did next was buy a new OEM TPS sensor; replaced the old one and it solved the problem (and the engine check light went off as well).
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Glad to hear you got it figured out. Thanks for telling us what the fix was!
i have had same problem runs fine when you first start driving it 5 or 6 miles its fine then if you leave it set and idle it revs up to about 2000 rpm and it will shut off sometimes wont shift in forth new tps sensor new map sensor new air idol control valve
code came up on scan tool po700 transmission control system malfunction put a new transmission control module on it ran fine about 30 miles back to square one any body ever have this happen to there car
hi, i do have a similar problem with high RPM & check engine light on. What would you suggest.
I also have similar problem.
I own Aveo LS 1.4,Limited version 2008 model. I am facing high rpm problem for last 5 months. The dealer has been trying to resolve but unsuccessfully. Initially the engine sized due to overheat due to crack in coolant bottle. He attended the same. He did the engine work. Replaced all the sleeves and valves. Since then this problem making my life miserable. The rpm increases to 1500 to 2000 whenever engine goes to idle mode during drive. He now says ECM is defective.
Why this should happen? Is the dealer correct? Is the dealer responsible for this problem?
Would any body on forum help?
Thanks
Hemant
Hi, Hemant. Welcome to the forum.
You never experienced the high idle problem before the engine was repaired?
The problem was there before engine repair, but not to this severity. In the mean while the dealer has erased the ECU programme and reloaded it.( As per the dealer). Since then at least for couple of days now it seems problem has disappeared. Earlier the dealer used to reset the programme but problem reappeared repeatedly. I have lost the confidence in the dealership but i have no option now as the engine repair warranty is involved. I am thinking to sell the car (even after spending about Rs 100000 ($ 1600). I am so much frustrated. I will never buy Chevy in future. Car is good but spares are costly and dealer service in Surat,India is very very poor. I suspect dealers are fooling customer to extract money in labour charges and spares.
I became aware to my utter surprise of one more thing, that none of the car of none of the manufacturer in this segment, has an audible alarm on high temp, coolant loss or oil loss which is fundamental protection for any rotating machine. The problems can arise due to many reasons but single most probable reason is poor workmanship or defective parts. I am a maintenance engineer in instrumentation so I can tell the cost for adding the audible alarm is insignificant especially when they already provided beeper for safety belt and door lock. Its a matter of programming or at the most some wiring changes. But it seems company has apathy towards this need of customer support. Instead car manufacturers have clandestine motive to make money out of failure of oil,coolant,over temp, fan failure etc. resulting in costly damage to car. Provision of the audible alarms will alert the user of the impending damage and will save from costly repair. It is obvious that user will not be vigilant enough to look at silent indicator for the over temp/oil loss etc while driving on a busy highway. I think the provision should be made mandatory as it is also a user safety aspect because unexpected seized/stalled car on a highway has severe consequences.
An alarm would be a good idea. My 35 year old 2-cylinder boat engine has one for high temperature, but none of my cars has ever had one. (Almost every one in this segment... no fancy cars.)
Then again, an alarm still relies on the driver to know what to do if/when it sounds. My dad once saw the oil light come on in an old Fiat while driving on the highway and didn't know how serious it was. He thought he could continue driving it to his mechanic. Of course he didn't quite get there before the engine siezed.
PS: glad to hear the ECU reset solved your problem.
Hi Daox. i have a problem with my aveo 2008 salon Manual gear in idle mode if turn on A/C the engine will not increase the rpm i have change the throttle body and change the sparks also change the fuel pump also check there is no leak of air also when check it by the OBD there is not code and still same problem!! could you please advise for fix it? is this problem with the ECU unit? is there relationship between the ECU and increase the RPM? also i would like explain that when drive the car in cold everything is ok but when driving for 1 hour and put the gear to N the RPM will come to 200 then back to 800 sometimes make the A/C off.
thanks you in advance.