Marty McCullough

Hello everyone newbie here

I have a problem in my 2005 Audi A8 3.0 v6 that I purchased. The car starts and idles perfectly although when I select drive or sport or use the flappy paddles and accelerate there is a hesitation a shudder from the engine. Its as if there is a misfire in the engine at certain points. The car will drive although continues to do this whilst you accelerate. If I place the car in neutral it will rev perfectly with no misfire symptoms. It leads me to believe there is a problem with the automatic gearbox..

Any help would be greatly appreciated.

Thanks

mishar

Welcome!

You need to scan it. VCDS or VAS. In the meantime pour some injector cleaner in your fuel and check how old are your spark plugs.

Marty McCullough

Thanks for your reply. I put it onto VCDS and it came back with cylinder 6 misfire and engine mount solenoid valve. I'm going to replace all spark plugs and see if this help and see if the engine mounting is leaking or done.

ltooz_a6_a8_q7

Acceleration vibration many times caused by the faulty engine mount.

Cheers and good luck,

Louis

MP4.2+6.0

Also scan the tranny if you haven't already, plus note/tell us if the shudder is always involving the same gear. There is a known issue around 4-5 that affects the ZF six speed if it turns out to be there consistently--also makes a "hooting" noise at the same time.

Spark plugs sound likely so far, but other possibles can be 02 sensor, MAF issues, cam/timing sensor issues, and the spark plug coil pack. You should usually see codes for those kinds of scenarios, and plugs sound likely/promising so far given the code. BTW, if plugs look good and/or if issue persists w/ the code, then expect it is the coil pack for that cylinder. Common modern Audi problem, and literally millions were recalled for new coil packs, my W12 (x12!) included.

Bangerla

Could be fuel filter, engine might not be getting enough gas flow under acceleration