1995 Audi A6

Engine Performance problem
1995 Audi A6 6 cyl Front Wheel Drive Automatic 172000 miles

1995 Audi A6; 2.8l, v6; 170,000 miles. Had fuel pump replaced about 3,000 miles ago. Has been running great. Today, while driving, the engine skipped, dropped RPM, acted like it wanted to stall. I nursed it about 1.5 miles home, while it kept dropping rpm and coming back. It would start and run smoothly at 3000 rpm. But exhaust is white and gassy smelling. I added fuel treatment to fuel. Replaced three of six spark plugs. It ran, died, and now doesn't want to start. Plenty of fuel pressure going into fuel filter. I have a new fuel filter but have not replaced. LOts of hissing noises in engine compartment. Vacuum tubes look old and frayed. QUESTION: How do I bleed fuel lines after replacing filter? Why is the engine not running? Oh, I should specify that the " CHECK ENGINE" light has been on and off for years, running fine; now, when it comes on, the engine wants to die.
May 17, 2010.

Hi there,

Thank you for the donation,

You do not have to bleed the fuel system, petrol systems self bleed, I would get any suspect engine vacuum hoses replaced and go get a diagnostic scan done to read these unresolved fault codes, there will be a problem with the engine management system somewhere, as when the engine runs poorly the check light is on, this is indicating that there is a system out of parameter and this is causing your problems.

Mark (mhpautos)

May 25, 2010.