Rough Rolling Idle + Code P0021 And P0011

[Ic0nic]

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

[ratter]

sounds like your cam timing has possibly jumped

[Ic0nic]

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

[ratter]

it's a common issue we see on these motors, I don't mean it happens to every second car but we have seen it over possibly 15 or more times.

Rocker cover needs to be taken off to confirm though, do not just take my word for it as it's just a guess based on what we have seen in the past.

you might want to read a thread titled "FG Dropped a Valve"

[towsw001]

I had almost the exact same issue of which my mechanic had to replace the cam timing solenoid and phaser.

Mine would be fine for first minute or two when the engine is cold and then kick in exactly as you said.

As Mick said it could also relate to the timing jumping a tooth.

[Ic0nic]

you might want to read a thread titled "FG Dropped a Valve"

As Mick said it could also relate to the timing jumping a tooth.

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!

[ratter]

for some reason I can not post links at the moment, as far as the repair it depends on how mechanical you are, there are some people that may be able to do it at home while there are some that would end up destroying their engine

[Ralph Wiggum]

Mick,

Are you seeing any pattern around the failures?

Ie Particular models/Power levels/Common mods?

[ratter]

no pattern, seen stock cars and modded cars

[Ralph Wiggum]

well thats comforting........