First off my car, 1999 Audi A4 1.8t Q AEB Tiptronic Automatic.

My car has about 153,000 miles on it. I have replaced alot of parts in the last month/year. Just the past month, I replaced all four coils because I was getting two codes for coils. I also replaced the ICM oem hugo. As well as the Up stream o2 and Down stream o2. I have had a 3" test pipe in but never had these symptoms before so I can't say I think it's that. I also purchased NGK Double Platinum Plugs. Also I replaced the Fuel Filter, Breather hose, Coolant Temp sensor, Coolant Flange and all Orings, As well as exhaust manifold and exhaust gasket. Followed by a transmission fluid change as well as filter and gasket.

I have Vag Com as well as a Chilton and Bentley manual and im stumped. To get to the symptoms.. I can drive the car and be light on it and really no issue for the most part. Now when I give it full throttle or a good amount it will go up to about 3500 or so and then start to almost cut out or just start bogging/jerking. During the first week this happened, I was two miles from work and went to accelerate from 45 to 55 and it started to chug and jerk so bad that I had to let off the gas because it felt like it was going to stall. I tried to disconnect the MAF, then start my car and that only seemed worse and I could barley keep the car running yet alone drive to test it. I did buy replacement coils off ebay but im showing no codes for bad coils or misfires.


Any help or suggestions would be greatly appreciated, I have been throwing money at this problem and scratching my head on solutions or if it is some how the transmission for weeks. I need my car for a new job, and have time to check anything or diagnose with Vag Com or my Bentley. I also saw that I had a vacuum hose off on the fuel pressure regulator for a long time. I put a new hose on but could this have messed the regulator up for the time it was off?

njohnson88@student.cvtc.edu if you can help me or have any sort or tips or advice on where to start or how to narrow something down.


Thanks alot, Nate.

 

What is your plug gap? Any mods to the car? Try capping the plugs down a little. Stock gap is .032" and if you have a chip you should be at .028". Try that tighter gap anyhow, just to see if the car clears up somewhat and let us know.

 

Only mod I really have is a Test Pipe. I still have the NGK Double Platinum's at the stock .32" gap.