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1998 Audi A4 Engine Misfire Cylinder 1

Tiny
NEILMANZ
  • MEMBER
  • 1998 AUDI A4
Engine Performance problem
1998 Audi A4 4 cyl All Wheel Drive Automatic 200K miles

At wits end, hope you can help- Check engine light flashing. Dx gauge shows engine misfire cylinder 1, I think it was code P0301. Changed spark plugs, swapped 1 and 3 injector, ran compression tests, changed fuel pump, same code comes up, same cylinder misfiring. Any suggestions as to where to go next?
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Wednesday, July 8th, 2009 AT 9:01 PM

2 Replies

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

Check the injection pulse, check the firing voltage on an oscilloscope and check for any vacuum leaks around No1 cylinder linlet manifold, start here.

Mark (mhpautos)
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Wednesday, July 8th, 2009 AT 11:55 PM
Tiny
STEVEW84
  • MECHANIC
  • 673 POSTS
You never mentioned anything about swapping coils. Not sure what motor you have in this thing. This car might have a power stage for coil control. See if you have a pulse from it. HTH
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Wednesday, July 15th, 2009 AT 9:11 PM

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