Ic0nic

I had the same issue in with my 09' G6ET a few months ago. Engine light on, really rough idle, scan indicated (using flash tuner) cam timing over advanced. Off to the mechanic it went, closer inspection to the timing showed the chain had jumped three teeth on the lower cog due to one of the teeth being slightly chipped. Also, the chain had stretched by about 4mm. Solution was new chain, new tensioner and bracket (bracket was broken, plastic) and new lower cog. Massive pain in the ass. I had about 95000 on the clock when it happened.

Just heard from the mechanic. The car has indeed jumped a tooth (spot on ratter) and needs to be adjusted. The mechanic has recommended replacing the chain and the tensioner to reduce the risk of the problem reoccurring any time soon. Is that the usual fix?

I dropped my car to the mechanic yesterday afternoon to get looked at. They said it was possible that the cam had jumped a tooth, hopefully I'll have a full diagnosis by this afternoon. They mentioned that they had seen jumped teeth on the B series cars, not too many on the FG's though. Does your car consistently idle roughly after this happens or does the issue disappear after a restart?

Thanks for the advice. I was unable to locate the thread you mentioned using the search function ratter, would you happen to have a link? Is this the kind of thing a home mechanic could do or would you suggest I take the car to a professional? Thanks!

Thanks for your response. What would cause something like this? How could I check if this is the problem?

Hi guys, does anybody know how to fix rough idle resulting in a P0021 and P0011? The car is an 09' G6ET with 90K on the clock. I've owned it for about 6000 KM's without any issues. The car was tuned about a week before the idle issue started but I don't think the two are related. The engine code indicates that camshaft timing is over advanced. When I cold start the car it sounds like the cam is ticking over too quickly for the idle to keep up, then it drops to regular idle speed (~500RPM) and the shakes rythimacly, approximately 1.5 times per second. I noticed adding revs using the accelerator the problem goes away, but after adding 100RPM to the tune and driving it for only a few minutes the problem returns just as bad as before. The code can be cleared but will always return, generally after a cold start. So far I have cleaned out the throttle body (no change) and I am considering changing the oil for the possibility of incorrect viscosity oil clogging the VCT sensor, which can apparently cause this issue. I remember a similar issue occurring in my previous car (AUIII), caused by a large chunk of the intake manifold gasket breaking off. Is this also an issue for the FG's worth exploring further for my problem? Can anyone provide anymore advice to solve this? Thanks in advance