TwinTurbo.NET: Nissan 300ZX forum - Plug gap. What are higher HP members running for a gap?
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Subject Plug gap. What are higher HP members running for a gap?
     
Posted by PiotrC70 on April 20, 2013 at 2:11 PM
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Message Per Ash's 6 P's: "Conversely, if you make the gap too small, you will notice misfiring at low load/cruising conditions as the spark is simply too small..."

I'm running the NGK Iridium 8's gapped to .028 and verified with feeler style gauge. Interestingly enough, IPP shows to run at .030 while SZ shows they're gapped to .028-.032.

PTU, Injectors, Coils all ohm w/in spec. Compression is great. New CAS installed and TPS set at .44. Datascan shows everything else as normal(from what I can tell).

My issue is just as Ash describes and have an occasional, random miss at idle and cruising speeds. I've only put about 2k on the new build since last June and can't recall when the "problem" started. Spark plugs were replaced with a 2nd set today and the "problem" is still there but less apparent since I haven't driven on these yet or put any load on them.

Thanks!

1993 TT. R.I.P. 09.15.2010

     
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