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Misfire could be Coil boots thought
Your vehicle may have one of two coil types. One has coil boots on the bottom of the coils. Think short plug wires. Their life is 80K max or 5 years. They are cheap. Purchase and replace them. Note: Different ones for BOSCH vs Bremi coils. Aftermarket only makes one version to fit either. Buy the Bosch or Bremi ones, you will be happier.
Pulling the coils out and pushing them back in, is usually the end of the road for the the boots. Now the resistance in the boot is greater than coil output, hence no spark at the plug gap inside the cylinder.
Yes, there is a gap setting on these multi-prong plugs, but it takes a fine wire gaping tool to determine the setting. 99% of the time you are good out of the box but most people view each plug to make sure they were not dropped in transit.
I think we discussed the pros and cons of these plugs in another posting.
Coil Images below: Old style w/ Boot on left, New style on right
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2005 X5 4.8IS
The Blue ones are always FASTER....
Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green
Last edited by StephenVA; 11-12-2015 at 11:00 AM.
Reason: Fat finger and bad spelling
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