View Full Version : Rough Idle, Bogging/ Stuttering undering throttle

10-05-2010, 04:05 PM
A few days ago my 1998 Audi A4 1.8T 165,000 miles started randomly, while driving, idling very heavy and then stuttering and bogging out when i accelerate. It is complete random sometimes not a consistent problem but a problem enough that I am currently not driving it. I am thinking that there is problem with the fuel/fuel filter or maybe something involving the turbo. I was wondering if anybody had any input into what might be the problem because if its a simple fix ie fuel filter I can do it myself but it is really hard to narrow it down to what might be causing the problem.

10-05-2010, 05:11 PM
I'd think Ignition Control Module first, but a fuel problem is also possible.

I'd check for codes, look at fuel trims, and log the MAF to start.

10-05-2010, 05:55 PM
Ok I should mention also that It hasn't thrown a check engine light which seems weird

10-05-2010, 05:56 PM
Possible Vacuum leak, bad MAF, Bad 02 sensor was having the same problem and changed out the fuel filter and the 02 sensor problem went away