Car stall when releasing foot when putting gas

Asked by GuruYJBS8 Apr 07, 2018 at 09:26 PM about the 2008 Audi A4 2.0T Sedan FWD

Question type: Maintenance & Repair

Hi deathjam4 I hope u can help me I have Audi A4
1,8 Sline b7 2008 ,car had some noise coming
from engine ,my mechanic told me noise was from
crank case hose had a hole ,got it later he told me
the car don't have much power & cranks twice or
more before it can start ,I got a new fuel pump the
car after fitting pump a vacuum pipe had a leak car
was misfiring, got original from dealer after
replacing ,Air relief valve was also leaking ,got
original from dealer ,now when the is on park rpm
goes up to 1,200 rpm  & few months thermostat
housing got broken water leaks & I replaced after
the next day when I hit the brakes at stop when I
put gas the car rev goes down when I leave gas it
goes up , so when get to stop before I hit gas I
leave brake foot 2 seconds then hit gas it drives it's
really annoying me

5 Answers

45,825

It sounds to me like the car is having some serious vacuum issues. I found a link to a website that shows a bunch of trouble areas that might help properly diagnose this issue which i will post a bit after this. One video i found which is simalure to yours said he replaced the pcv valve and prv valve fixed the issue. how many miles do you have on this car? and when was the last proper tune up? such as plugs and wires and fuel filter and such? once you have the car fixed I would do a proper tuneup. Bringing a car out of the pits can be hard if the maintenance has been lackinging. When i had my old 1998 audi i was still doing repairs on it 7 years later to keep it running right and i still had not fully fixed it before i got rid of it. I would probably have the whole vacuum system torn down cleaned out and replace what looked to worn out I did that the second year after i bought my 1998 as the hosing was pretty cheap. still have spare hose for it today :P any who go over the link i am provideing and have the trouble area's fixed and try replacing those two valves i mentioned if you have not done so already. It would not be a bad thing either to break down the air system and remove the thortle body and have it cleaned and then reinstalled with a new gasket and clean all the sensors in the air way as well. should help. https://www.pelicanparts.com/techarticles/Audi_B6_A4/47-ENGINE- Fixing_Common_Vacuum_Leaks/47-ENGINE-Fixing_Common_Vacuum_Leaks.htm

1 people found this helpful.
Best Answer Mark helpful

Thanks Deathjam4 I've done oil service on two months ago ,New oil ,New petrol filter ,oil filter,Air filter & New plugs + diagnosis

45,825

get them vacum lines and crank case hoses checked out they make a huge differance in a stable running audi.

That vacuum steel pipe has a crack ,I've bought new second hand from Fourspring Audi spares ,will let u know when it's right & Thanks a million times Deathjam4 u are the master.

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