Question about 1999 Audi A4
Car starts but runs rough,hesitation when accelerating,sometimes dies
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Posted on Jan 02, 2017
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 www.audiworld.com, 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
If it had points and carb i could diagnose it but with all this computer control stuff it could be anything from a faulty sensor to a dodgy fuel pump or evan a multiplug loose .i would suggest the dealer to diagnose it sorry i cant be of much help but evan the software is encrypted and the vehicle has to be connected via the internet to stuggart
Posted on Jun 06, 2009
It sounds more like you've got an intermittant vacuum leak. Try, with the engine running, spraying some WD-40 or any kind of penetrating lubricant spray,over the intake manifold area and any related vacuum lines. If you hear the engine strat to stumble, providing you're not shooting directly into the air box, concentrate the spray on that area until you're able to pinpoint a loose, cracked. or off, vacuum line or hose.
Posted on Aug 22, 2009
MOST TIME CAR STUMBLE OR HESITATION ON ACCELERATION YOU.HAVE A SLIGHT LEAN FUEL MIXTURE.CAUSED BY STOPPED UP FUEL INJECTORS OR FUEL FILTER SLIGHTLY PLUGGED.
Posted on Jun 07, 2010
Testimonial: "thank you!!"
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