So a couple weeks ago i had a very rough start where it started very harsh and idled rough but was fine after a minute or two but it also through the cel. Well i was already scheduled to go to the shop the next day so i just had them clear the codes since it was running fine. i know a few of the codes had to do wiht a misfire. Well recently it has been still idling rough will fluctuate occasionaly between 800-950 rpm and sort of shake as well as when im coming to a stop. As well as at idle im only at about 18 inHg compard to usually at 22. i still reach about 20 lbs boost under WOT and off throttle at about 26 inHg and during shifts it seems a bit harsh right at the shift. Does any one have any ideas off hand what the issue could be? any help would be appreciate.

 

Sorry sooks. Not ignoring you...just no idea.

 

yeah.. i dont know..

I have 3 ideas.. as i havent got to look at it yet..
1. vac leak somewhere.. Seems to me it could be running lean.. and with a vac leak the turbos will work harder giving me full boost normally..but under idle getting less vaccuum.
2. bad/old spark plug or misgap.. if its just not firing correctly ..obviously
3. doubt it..but potential maf.

 

sorry sooks. i wish i could help, but i am drawing a complete blank.

 

idle control valve/sticking throttle flap or TP sensor

 

Avant.. That did come up with a discussion between me and my friend while we were thinking waht it could be with teh throttle position sensor...

Do you have any ideas what would be a good indication that that may be it.. Im still looking to get on a vag here soon.. do you knwo what codes will show for that if any.

 

have you done a throttle body adaptation?

you can rule out alot of those possible causes by logging with VAG

what DTC codes caused the CEL?

 

tryign to get on a vag by the end of the week...