Thread: general programming question
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Old Tue, March 9th, 2010, 07:04 PM
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Originally Posted by cody994x4 View Post
my question is does power programming increase compression?

im wanting to get my order in soon, i got a tune up done last week and within 150-200miles i had a plug go out. new plug/coil pack on cyl. #7...luckily threads were intact and im up and running good agn. just dont want it to happen agn.

also, can a bad coil cause a plug to go out?
No - power programming has no effect on compression. That is governed by the difference between the cylinder's volume at the bottom of the piston stroke and the volume at the top of the stroke. Poor ring seal or valves that don't quite close properly will, of course, reduce the compression you actually achieve.

I wouldn't think a bad coil could cause plug failure. I suppose a coil that generated a "weak" spark might allow the plug to foul, since you might not get a good ignition source. A more likely cause of plug failure is some hamfist mechanic putting force on it that cracks the porcelain during installation. Some kind of manufacturing defect in the plug could contribute to failure too.

- Jack
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