Simple enough:
My 2004 Hatchback has it's engine revving randomly up and down between idle and 2500 RPMs. it happens when it's at still, in park or in neutral.
It's only been happening recently, the mileage is 50700 ish and I have no idea what's causing it and I'm afraid of taking it to a dealer because they'll just charge me all sorts of stuff, but it might be my only option at this point, unless one of you guys has had the issue and got it fixed.
Kthx
"If I parked a T-72 tank in my back yard, aimed the cannon towards Mexico, and muttered something
about protecting my village from an invasion, the police would show up and probably haul me away."
http://www.cardomain.com/ride/2619314
I know this is an old post but, I need to revive it. My 04 also jumps up to 2500 at idle. So far I have replaced both vacuum lines that cross the intake, replaced the idle air control valve, removed throttle body and cleaned, replaced throttle position sensor, did the ecu idle relearn. Their are no coolant issues at all. Im stuck at this point, I am open to any suggestions someone may have. I do have the full AEM cai but, Ive had the idle issue roughly 6 months longer than Ive had the cai. Other than the cai, the engine is completely stock
you guys also have the sticky throttle body issue.
[QUOTE=petrified.rabbit;150403]you guys also have the sticky throttle body issue.[/QUOTE
On the repairs list, I forgot to mention a new cat and new a/f ratio sensor (heated O2). I can monitor the O2, but at this point, I wouldnt be able to get a comparison reading unless you (rabbit) have reading or someone else on here, anytime im at idle its anywhere from 2000 to 2700 unless i hold the break and ride the clutch with it in gear to load the engine. With the engine under load, their is no idle issue. If im cruising at 60 and coast to a stop, as soon as it goes into neutral, or the clutch is fully pressed, idle jumps instantly. Here in a little while when I go to lunch, Ill hook my scantool up and see what I can get from the O2.
Their is no surge. When I start the car in neutral it jumps to 2500 and stays there until engine has a load. And it is not sparatic. first thing in the morning while engine is cold its high idle, an hour drive when engine is at operating temp, its still a high idle. Any time im at idle, its high.
Last edited by paulsaveo; 05-13-2011 at 03:46 PM.
check the o2 reading to see if the surge in idle is more fuel or more are (surge cause lean, or rich). Take that info to do an engine load comparison. And that should point you toward something. You seemed to address an air issue, which at idle would stall more likely unless the car started to add fuel to compensate (running lean when not surging). Or if you have too much fuel the car would be cutting fuel to bring the idle back down.. (running rich when not surging). You seemed to address all the air related possibilities exact the two intake sensors, check those. On the gas delivery side, it could be simply the warm up circuit, an injector, even bad o2. But check what your getting with the scan tool.
I know this is an old thread, but, would like to share what I had on my 09 (E-Tech II engine, cable throttle). When brand new I had this issue, engine revving up to 2,000 and 2,500 and staying there while idle. Took to the dealer and they replaced the TPS sensor, it seemed to be fixed, but in a couple of days the issue was back, they now replaced the TPS connector, issue solved, until yesterday (4 and a half years after) the issue resurfaced, but with a slight difference, sometimes it feels that the engine is providing reduced power (less than usual) so, taking it to the mechanic tonight or tomorrow morning, will share the outcome.
Carlos
Last edited by vcarlos40; 02-16-2014 at 04:48 PM.
Just heard back from the mechanic, he checked the wiring and the connector, they were fine, he replaced the connector anyway, the issue was the actual TPS sensor this time.
Hi Carlos,
I’m sorry to hear that you were experiencing some concerns with your engine in your Aveo. I understand that you took your vehicle to the dealership for this concern and the problem returned. I also understand that you have taken your vehicle to a mechanic and now your concern is resolved. If you are to have any other concerns regarding your engine, please don’t hesitate to let us know and we will take an extra look into it. Also, if you have any questions or need any assistance with your vehicle, please feel free to let us know. Thanks for keeping us all updated!
Kristen A.
Chevrolet Customer Care
Don't forget to check out my.chevrolet.com link and take advantage of a wealth of vehicle information!
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Thank You Kristem
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