fazi Posted November 1, 2021 Report Share Posted November 1, 2021 LINK MONSOON G4 ON A COSWORTH YB ENGINE WITH K20 HONDA PENCIL COILS. car is an escort with fresh engine, new BHP LINK kit with wiring harness, currently on rolling rd. Has a misfire at 5500rpm on ngk so tried different make s/plugs, makes no difference but when champion low resistance racing plugs fitted, fault goes and revs to 7000rpm. Tried new crank sensor and new different make coils no difference, but cold start becomes an issue with the racing plugs so cant use them for perment use but have been able to map system . Dont know if this is a frequency issue with harness or ecu itself any suggestions appreciated Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 1, 2021 Report Share Posted November 1, 2021 Would really need to see the log and tune to see if there are any clues, but spark plugs should make very little difference to the available ignition energy provided they are clean and have the same gap. Quote Link to comment Share on other sites More sharing options...
kaptainballistik Posted November 2, 2021 Report Share Posted November 2, 2021 Turbo or non-turbo? Quote Link to comment Share on other sites More sharing options...
fazi Posted November 2, 2021 Author Report Share Posted November 2, 2021 turbo with max boost at 1.2bar plug gap 0.028" if boost is upped at fault occurs sooner, i am thinking dwell time may be the issue Quote Link to comment Share on other sites More sharing options...
kaptainballistik Posted November 2, 2021 Report Share Posted November 2, 2021 Hmm.. I’m getting something similar and it’s driving me mad! Quote Link to comment Share on other sites More sharing options...
bsh Posted November 3, 2021 Report Share Posted November 3, 2021 Do you have any trigger errors? Does the trigger error counter increase when misfiring? If so, you should try to alter your trigger settings. I use regular, cheap NGK plugs in these engines running 0,60 mm gap. No problem with 500-600 whp running E100 as well. I use the genuine vw cop plugs with built in igniter. I use these on many, many engines with success. No misfires. Quote Link to comment Share on other sites More sharing options...
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