Steve C.

Hi all,<p>Im still having tons of problems with my '98 A4 1.8TQM jerking or bucking when I lift my foot off the accelerator at around 3000 rpm... has anyone successfully figured out a solution on this one? I noticed lots of discussion in the past on this type of problem but would love to find out a solution since my dealer doesnt acknowledge it is a problem. <p>Thanks!<br>Steve

Loreon

Recall reading something about the diff not matching the engine/transmission, i.e. 1.8T vs 2.8 ... have you looked into this?

DaveN

I had a problem with jerking coming off throttle after I chipped mine. Doing the throttle adaptation cured it though. I also never had the problem with the ECU that came with the car, so if you have a poor transition off throttle I would be inclinded to say it wasn't normal.

Steve C

Thanks... btw whats the throttle adaptation you mention?

Klidge

I experience the same problem. This engine belongs in a $15,000 car.

MattS

Same thing happens to my 96 2.8, but the dealer also says "nothing is wrong when they drive it!" It doesn't happen all the time, but they are aware of the stink I put up so I don't think I'll have any problems in the future if something bad happens.

Andy Hedin

In bumper to bumper type traffic I've noticed that the car can be kind of jerky, especially if I wind it over 3,000 in 1st and take my foot off the gas (like if the guy in front of me slows a bit).<p>My biggest complaint with my A4 1.8T is the slow-speed drivability of the car...pretty "jerky". I think this will be my last 4-cylinder engine....V6 or V8 for me from now on.<p>Andy Hedin

ChuckH

...just in first gear. Parking lots and heavy traffic used to be embarrassing. I have learned to modulate the throttle and the clutch pedal in order to eliminate this tendency, and I think it has calmed down over the miles. Although I'm sure there is something in the engine controls that is working to stabilize the idle and what not, and likely getting somewhat confused on occasion, I think the main cause is driveline lash and the TorSen differential catching and releasing. I'm sure if you spend enough time in those situations, you will eventually learn how to control it like I have. Good luck! :-)<p>Charles<br>

Tim Long

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DaveN

If you put a different computer (ECU) in it needs to figure out the position of the throttle (it's calibrating the throttle posistion sensor I believe). To run the adaptation just turn the car on, but do not start it. Let it sit on for 3 minuites, then turn it back off. You're now done.