I apologize if this is long, been dealing with this for a long time lol.
I have an ongoing idle issue I need assistance with, I should probably say that idle issues seem to be a problem with these cars, but so far all the tips I’ve tried have failed 🙁 my dad was a GM mechanic so I learned a lot growing up but I am completely stumped here. Unfortunately I do not have a live data tool.
2012 cruze, 1.4l turbo engine. Automatic transmission. 86k miles is that helps 🙂 I do not have a check engine light, never gave one either 🙁
It has an issue where it idles rough when cold, then when the engine is warm it has a dropping idle. It will idle fine around 700 RPM then randomly drop to 500 and it gets rough, then catches itself and idles fine. It’s interesting to note that it’s like that if the AC is on or off, it thought it was the compressor at first. Zero change. It also doesn’t have a problem starting at all.
Things I’ve done:
New spark plugs and spark plug boots
Vaccuum leak test
New o2 sensors
A common problem with these cars are missing check valves, I noticed one of mine was missing and unfortunately it is non serviceable so I bought a brand new intake manifold. It came with new MAP sensors,
Fuel rail and fuel injectors, throttle body, check valves, gaskets, purge valve, IAC and brake booster. (Yup it cost $600)
Another common issue was a failing pcv burst disk in the valve cover so I bought a brand new valve cover. (Yup, $180 for that sucker) I bought it because the car had the infamous burning oil smell and this fixed it.
I refuse to believe this is normal for this car. It’s idling rough and then dropping like it wants to stall. I don’t know what else to do…
The car has 2 temperature sensors but I feel like if those were an issue it would have an engine light? It has a coolant temp screen and it hasn’t given an indication that there’s a problem.
Thank you in advance!
You must be logged in to reply to this topic.