cjromney

Decided to check that out yesterday. The lines were dry. Don't think that's it. I also found that it doesn't make a difference if I allow a vacuum leak to the manifold. The leak has to be upstream between the MAF and the Throttle Body. As a temporary fix I have rigged a crankcase breather filter to the intake duct to allow a leak with filtered air. The idle problem has gone away but the check engine light still comes on. I'm waiting for the Ross-Tech VAG-Com to read the codes.

Prospeeder

did you have the car running when you checked the regulator? fuel does evaporate quickly.

cjromney

Yeah

CRAZY_RUSSIAN

ive never hear of fuel pressure regulator going out on these cars.
have you cleaned the contacts on everything? also test your temp sensors (there are 2 of them)

upallnight

You must not read all the forums.

https://www.audiworld.com/forums/sho....php?t=2821343

CRAZY_RUSSIAN

your right, i dont read all of them and im not here all that much anymore

jbasilio95b4

so what happen with your car because my car pulled up the same codes and the light comes on only after i drive 10-12 miles and about 1 mile on the way back from work.

cjromney

I'm still not sure. I haven't figured it out yet. Mine is the same with the engine light not coming on till later in the mornings. I have found that it is worse with warmer temperatures. I will let you know if i figure anything new out. Please do the same if you figure it out.

jbasilio95b4

yea, I believe that it has something to do with the temperature because its been cool out and it hasn't come back in the last 2 days but i think the hose that goes into intake manifold from the brake booster causes a vacuum leak due to cracked rubber. I tight mine down with a clamp but I am going to replace soon. I havent had time to try this but it may help you if you do,

https://www.audiworld.com/tech/eng62.shtml

cjromney

After all this time of fiddling, searching, and much determined contemplation, I have the solution. All of the idling issues were caused by my car running very rich. It was running rich because of issues with the engine coolant temp sensor and the ground wire on the back of the intake manifold being loose. Thanks for the help and I hope this helps others. It has been very frustrating.