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Have you guys got a boost cut defender or aftermarket ecu? as the stock ecu will cut ignition at about 12psi.

Just a thought, it might be boost cut.

I am running NGK BCPR6ES (pre gapped at 0.8mm) with 200 odd rwkw and I can just keep winding the boost up (most I have used is 1 bar - its a stock turbo) but haven't had a problem.

Heres how i would go about it.

1 set boost to 11psi or lower if the problem exists at that boost

2 Have my new plugs gapped to .6 or so

3 Take kick panel off to expose the computer and check wiring for loose connections

4 Unclip Ignighter pack for a known good one and take the car for a run

5 Take 1 known good coil pack and give it a run each time swapping good coil pack to a different cylinder

6 Replace computer with known good one

Ive done this from easiest to hardest labour wise..

Ecept the computer as it is rare for it to happen plus availability of a spare is sometimes difficult.

Good luck mate

OK....Gave the car I run today....running at .8 BAR the car started misfiring at aroung 5000RPM...

I had a look at the S-AFC and noticed that all the settings were set to zero. I re-entered the correct settings but unfortunitly the misfiring still occured but now it starts to misfire at lower revs...

  • 1 year later...

i had this problem with my 33........turned out to be standard fuel regulator. i got a malpassi and everythings sweet........to test coils pull em out and take to auto electrician...they should have an ohms reader to test the resistance......

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