Mazda MX-6 Forum - View Single Post - Spark issue in 5th gear only
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post #2 of (permalink) Old 11-9-18, 14:57
Mazda Carnage
 
Join Date: Mar 2004
Location: canada
Age: 45
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I can tell you that running 30psi on a T3 60trim using 2600cc's of fuel and 400cc's of water meth to maintain a 10.8 A/F ratio, ported everything, ngk v grooves gaped to .35 with NGK blue wires (mix and match), factory ignition and have no arching or blown spark to redline in 5th.

Are you running an MSD 6a or 7a ignition with the coil ?

If not try the factory coil and ignition, and add an engine ground or two from different spots than factory, to frame bolts or to the battery.

5th gear is the heaviest engine loading gear, it could also be a megasquirt reading or programing issue, but distributor output pickup signal only appears to be an issue at high rpm and would be constant in every gear.

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