Fixed Missfire Problem

For the RWD SR20DET cars! Sponsored by Wiring Specialties.
ItzGenX
Posts: 1204
Joined: Wed Sep 04, 2002 7:46 pm
Car: Smoke Purple 95' S14.5. Powered by the "Iron Man".
Location: Gulfport, MS
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If anyone has ever followed some of my post, one of my problems was that my car would miss when cold started or even warmed up but not driven around under mid boost. Before, I would have to drive the car around for a good 10+ mins until I can hit good throttle/boost. Today I checked my spark plugs with a different spark plug gapping tool (5 bucks). This one is way more accurate then the one I used from autozone (89 cents). First I checked my gaps with my old gapper, and it read out to be around .028 inches. I then checked the same spark plug with my new gapper and it showed to be at .036! I quickly then gapped all my plugs with the new gapper down to .028 and gave it a cold test run (warmed engine but not driven after cold start). I felt a slight miss at 7k RPM. I then checked my coil pack harness and put some electric grease into the connectors and ran it again, NO MISS!! The ultimate test (not recommended) was when I left work today, I started her up and let it idle for 3 mins (not warmed, barely), then ran off. STILL NO MISS! It also pulls slightly harder then it did before.

Turns out that my heat range 7 iridiums can't fire over a .036 gap when under a certain temp, which was why I needed to drive it around for a period of time before pushing it.

Lesson Learned:Do not buy those cheap disc shaped gappers and make sure electrical connectors are sitting good.


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