Question about 1998 Audi A4

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No acceleration,audi 1.8t,runs like no boost

1998 audi a4 1.8t has lost take off acceleration,also does not seem to accelerate like it should at highway speeds. no warning lights, idles smooth. could this turbo problem?

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  • Anonymous Feb 10, 2009

    when i put my audi in drive it takes time to pick up speed and at times it would get stuck on first gear also while driving it has power loss what could this be i have no warnig lights on

  • Anonymous Mar 26, 2009

    ive got the same issue with mine too, hope somone knows what the heck is up, i even changed out my computer...knowing it really wasnt, but just to check and its still the same, when i get it fixed ill try to post back. I dont have an engine light either. I think it miiiight be a clogged cat. But ill see

  • timesend Apr 06, 2009

    hi i also have bad acceleration, lack of power, high fuel use, so far ive changed fuel fillter, coils, turbo, maf, o2 sensor, plugs, checked timeing, air filter, checked all by pass valves, hoses , vacum lines, fuel presure.

    drive the car at 55 mph reads 18 mpg, change into 4th reads 12mpg, this is not good, also cleand tbh and in take sensor, water temeture sender is fine, when replaced turbo cat also looks fine, also has good compression, thought about the ecu, but someone has also tried that and made no diffrence. i hope there is someone out there with an answer thankyou for any input anyone has.

  • yadayada
    yadayada May 11, 2010

    When did you last change the fuel filter, is the fuel pressure ok under a load like on hard acceleration?



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It's possible that the diverter valve (DV) has failed. The OEM valve has a plastic diaphragm inside and it can crack. If this happens, the car will leak boost air and will lose power as a result. Go to, click on Resources, then Tech, and then go to the engine article about replacing/upgrading the diverter valve - it'll show you where it is and how to do it.

Posted on Mar 27, 2009


I have not changed fuel filter, bought car used just afew months ago.

Posted on Nov 05, 2008


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Posted on Jan 02, 2017

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SOURCE: no acceleration,audi 1.8t,runs like no boost

have you tried cleaning out the throttle body as i had a similar problem and this worked

Posted on Nov 29, 2008

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