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A8 Will not Start, turns over shows cyclinder misfire

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Old 06-26-2007, 08:30 AM
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Default A8 Will not Start, turns over shows cyclinder misfire

Dealership had car for 2 weeks. They couldn't find the problem. They thought it might be a head or heads.

They wanted $8500 to $12,000 to fix !

HELP
Old 06-26-2007, 08:45 AM
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Default crank position sensor...it probably grounded out on the exhaust.

its in the back of the motor behind bank 2. follow the wire down and i bet the plastic sheath is melted and the wires are touching.
Old 06-26-2007, 08:48 AM
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Default They are clueless

What year, what codes, if it's a facelift car, could it be the immobilizer?

Follow KYNZ's advice also.
Old 06-26-2007, 09:01 AM
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Default Re: A8 Will not Start, turns over shows cyclinder misfire

If that is really the problem I am going to flip.
They had the car 2 weeks. Charged me $440.00 dollars, left pieces out of the motor and now
it drips gas when I start it.

I then paid $300.00 to have it towed many miles home Any colors on wires?
Old 06-26-2007, 09:18 AM
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Default Re: They are clueless

At the risk of asking, facelift?

The car is all stock,,, imobilizer?

I am clueless as well. The car will start
and sputter , basically barely running at all.
If i put the pedal to the floor it will rev up.
then stall.
Old 06-26-2007, 09:44 AM
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Default Sounds like a pre facelift car - 97 to 99 if in the US

Now it drips gas, that's because they put pressure on the high pressure fuel line or it's not tight enough.

You need to pull the codes with vag-com and report them here.<ul><li><a href="http://www.audipages.com/Tech_Articles/enginemechanical/fuelleakrepari.html">Read this</a></li></ul>
Old 06-26-2007, 10:46 AM
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Default facelift is a 00-03 A8 (they changed the front end, ie. "facelift")...

and based on the symptoms, it definitely sounds like a crankshaft position sensor. it the clip attaches to the firewall on the driver side behind the engine and the wire runs down the back of the engine to the sensor on the camshaft. if the clip has broken loose from the mount it can dangle freely, causing the wire to touch the hot exhaust and subsequently shorting out the sensor. There are 3 wires on the cable, each should be seperately shielded (taped) and, if not broken, all taped together and then wiretied back away from the motor and exhaust. the sensor is about $120 from the stealer. Personally i would get them to check that out, FREE, and have them put BACK the "extra pieces" free as well. Then kick them in the nuts and find an indie mechanic to do your work from now on. good luck. Oh, and POST THE CODES from your check engine like reading.
Old 06-26-2007, 10:58 AM
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Default Re: facelift is a 00-03 A8 (they changed the front end, ie. "facelift")...

I need to go home, charge the battery and try that. I miss this car bigtime, PS you guys seriously ROCK !
Old 06-26-2007, 11:05 AM
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Default Very similar leak on the AAN (urS4/6) motors no? Audi had a recall to...

keep gas from leaking down on the turbo. The crimp in your photo PW is exactly as on the AAN that failed is it not PK, Bruce, Keith, et.al?

Mark
Old 06-26-2007, 12:11 PM
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Default I believe it's exactly the same as the A6/S6

The fuel lines on the pre facelift cars start in the front and run to the gas tank. the facelift cars have connections where the flexible lines are. A set of fuel lines is about $900 from the stealer for pre facelift cars.


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