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The O2/Vacuum sensor socket (the long one with a slit in the side for the wire) is an irreplaceable tool in a job like that. I never thought they existed, but when I needed to take it off, my dad enlightened me about it. I think you could even take out the upper O2 sensor with the heat shield still in (I could be wrong though)...
Well, the new O2 sensor went in last night. Didn't help. So, still thinking about whats giving me this error.
I also got the new airbox from serega installed. Its nice to have one that actually seals up to the filter.
How many miles were on the Aveo when you bought it?
108k
As an update to this thread, I haven't really done anything. 8-[ Still have to fix the front suspension and check engine light.
P0300 can be tricky. Or can simply be the crankshaft position sensor. You may have a bad one on there. The wiring for the sensor may be messed up or damaged. The 04 and 07 sensors might be different and incompatible.
Hard to know since you never saw either engine you have there actually running in a vehicle.
A problem with a specific cylinder would be a p0301-0304.
A fuel pressure problem may cause something similar. Harbor Freight sells a good, cheap gauge set that will work on about anything.
P0300 can also pop up while driving down a rough road- which is not your case because I understand the light comes on without driving?
Yes this is my first post. I just bought an Aveo today and read this thread front to back and wanted to chime in based on my own experience. Thanks.
Thanks for the tips Abe.
I have thought about swapping the crankshaft sensors. Its kind of burried so I haven't resorted to that yet.
Fuel pressure I don't think is a problem. I've run the engine to fuel cut a few times and it pulls fine all the way.
Why might rough roads create misfires? I've never had a problem with any other car I've ever driven around here...
The rough road sensor prevents the ECM from triggering a misfire code when the road is rough. It would not cause a misfire if it was bad. I doubt it would prevent the engine from operating in closed loop too.Quote:
Originally Posted by Daox
Rough roads don't cause mis fires per se. Rough roads can jostle things around and cause minor fluctuations in crankshaft speed which can make the ecu think the engine is misfiring and cause a code.
A bad crank position sensor can also make the ecru think the engine is misfiring, even though it may not be misfiring.
Is it actually misfiring? A vacuum gauge may tell you what is going on.
If somehow you had an off balance flywheel or clutch it may have a similar effect.
Good luck. I'm anxious to hear how the story ends!
I swapped the crankshaft sensor last night It didn't help. I cleared the code and it came right back.
Damn