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1999 Audi A6 Why is my car still missing on multiple cylind

Tiny
JEN1234958
  • MEMBER
  • 1999 AUDI A6
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 212,000 MILES
I recently bought my audi a6 wagon and did a motor swape b/c the other enginge blew. So I put one in with 68,000 miles. Before I bought the car it sat for 3 months. I put new gas in and it ran better. But now I drive it has random missfires.I changed. Spark plugs & wires, o rings, coil pack, intake gasket, cleaned out the intake completly And know it missfires when you go up a hill and coast down the other side and start to give it gas again it starts to miss. Please help!
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Friday, June 4th, 2010 AT 7:33 AM

2 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

You need to get a run on a chassis dyno, this will be able to be loaded up to simulate actual road driving loads, and the ignition & fuel system can be viewed electronically to check for any faults, I would get this done.

Mark (mhpautos)
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Friday, June 4th, 2010 AT 8:12 AM
Tiny
MINHNGUY
  • MEMBER
  • 3 POSTS
One of the power transistors ( located on the air filter box ) does't work.
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Sunday, September 11th, 2011 AT 5:10 AM

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