Misfire detected

2004 AUDI QUATTRO
157,230 MILES • 1.8L • 4 CYL • 4WD • AUTOMATIC
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EEVEGAS
  • MEMBER
  • 1 POST
Already I already put some new spark plugs.
Code :
Random/Multiple Cylindre Misfire Detected
P0300 - 008 - Implausible Signal - Intermittent
p0302 - 008

It is not dripping coolant by the spark plugs, I mean they are dry (as it should be).

Jun 1, 2017 at 7:37 PM
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JIS001
  • ✓ASE Certified Mechanic
  • 3,412 POSTS
  • ASE Certified Mechanic
If it is a random misfire then order a fuel additive from Audi and pour into fuel tank with a full tank of premium fuel. Drive vehicle on freeway for 20 minutes and after that normal driving. Most of the time works to clean off the carbon off the injectors since they are direct injected.

If the misfire is only P0302 then swap #2 and #4 coil and reset codes. Road test and see if misfire follows coil and sets a P0304. If it does then replace the coil.
Jun 4, 2017 at 9:11 PM
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