Got P1128/P1130 at idle.

[Jager]

Originally Posted by timqqt

My local said it is the problem of an intake hose. Do they scam me?

What does your local specialize in??

The diaphragm inside the AOS is cracked.

[timqqt]

Originally Posted by Jager

What does your local specialize in??

The diaphragm inside the AOS is cracked.

They specialize in volkswagen. Here's the pictures of the leaking hose they said. I am confused that these hoses are before the MAF. The air should be adjusted. Thanks for any help!

[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

[blue62]

Originally Posted by timqqt

They specialize in volkswagen. Here's the pictures of the leaking hose they said. I am confused that these hoses are before the MAF. The air should be adjusted. Thanks for any help!

There are no hoses that enter the intake before the MAF sensor.
If there is a vacuum leak in the hoses that you are pointing to, then that air is not adjusted.
The vacuum leak in those hoses is part of your problem.