Got P1128/P1130 at idle.

[Jager]

Tim, You might have other vacuum leaks besides the AOS. If your mechanic did a smoke test he might have found a cracked hose(s). BUT, if you have major suction at the oil fill tube the AOS is bad.

[timqqt]

Originally Posted by Jager

Tim, You might have other vacuum leaks besides the AOS. If your mechanic did a smoke test he might have found a cracked hose(s). BUT, if you have major suction at the oil fill tube the AOS is bad.

Yeah. I did see a lot of signs of AOS failure. Like, the car runs rough at idle only when it starts from cold.

I am just curious that does the fault code relates to the failed AOS or the leaking hose.

[Jager]

Originally Posted by timqqt

Yeah. I did see a lot of signs of AOS failure. Like, the car runs rough at idle only when it starts from cold.

I am just curious that does the fault code relates to the failed AOS or the leaking hose.

Yes, a bad AOS will trigger those fault codes. I have seen it a few times.

[timqqt]

Originally Posted by Jager

Yes, a bad AOS will trigger those fault codes. I have seen it a few times.

Thanks. I am gonna work on those. I just replaced the engine air filter. Some oil residual on it. Another sign of failed AOS?

[Jager]

Originally Posted by timqqt

Thanks. I am gonna work on those. I just replaced the engine air filter. Some oil residual on it. Another sign of failed AOS?

You shouldn't be seeing oil on the air filter unless it was a K&N reusable filter, Tacky Oil is used on those. I can't imagine someone spraying tacky oil on a paper filter... but???

A bad AOS will cause oil in the intake cross-over tubes. One of the signs of a bad AOS is smoke at start-up... Have you experienced that?

[maytag]

Originally Posted by timqqt

Thanks. I am gonna work on those. I just replaced the engine air filter. Some oil residual on it. Another sign of failed AOS?

Tim, you're getting good help here from Jager, so I hesitate to interrupt.
However:
I have seen oil (in small amounts) get to the air filter due to a bad aos, when combined with a poorly running engine.

Under normal conditions air only moves in one direction through the intake tube. However: if your engine "backfires", even just a slight stutter or a cough, then yes, you can see air moving the other direction, though only momentarily. I wouldn't worry about it at all, for the moment, as you could end up chasing squirrels that aren't there. I would focus first on your AOS, then on your vacuum leaks.

Then let us know how it goes.

Sent from my SM-G970U using Tapatalk

[Jager]

Originally Posted by maytag

Tim, you're getting good help here from Jager, so I hesitate to interrupt.
However:
I have seen oil (in small amounts) get to the air filter due to a bad aos, when combined with a poorly running engine.

Under normal conditions air only moves in one direction through the intake tube. However: if your engine "backfires", even just a slight stutter or a cough, then yes, you can see air moving the other direction, though only momentarily. I wouldn't worry about it at all, for the moment, as you could end up chasing squirrels that aren't there. I would focus first on your AOS, then on your vacuum leaks.

Then let us know how it goes.

Sent from my SM-G970U using Tapatalk

No doubt backfires would throw oil onto the air filter if you had oil in the intake/throttle body. I have not seen that since I have never had a Porsche motor backfire.

So Tim, has your motor backfired??

[timqqt]

Originally Posted by Jager

No doubt backfires would throw oil onto the air filter if you had oil in the intake/throttle body. I have not seen that since I have never had a Porsche motor backfire.

So Tim, has your motor backfired??

I think I never experienced that. But you are right, I used K&N air filter!