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Miss at all RPMs with #1 spark frequency lower than other 3 cylinders 200 1986

posted by  1fatuheeva on  Sat Nov 10 06:37 CST 2007
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last visit: Wed Oct 21 15:55 CST 2009
[RELATED]

Hello Brickboard,

I have been trying to chase down a consistent miss at all RPMs for a while now. I've got new Bougicord wires, NGK copper-core plugs, and cap/rotor. I've thoroughly checked for vacuum leaks and replaced the intake manifold gasket. I've cleaned the flame-trap and the IAC. Made sure the FPR is not leaking, watched the injectors fire, replaced/adjusted the AMM, watched the O2 sensor output fluctuate correctly with DMM and forced the engine rich by disconnecting the FPR vacuum and nothing seems to make a difference.
Today I decided to hook up the timing light to each wire just to see if anything obvious showed up (and yes the timing is correct). Besides apparently seeing the stumble in the spark pulse on the coil wire the most surprising thing to me was the frequency rate of the pulse on cylinder 1 versus the others. Cylinder 1 seemed like it might be firing at half the rate of the other 3 cylinders though this seems unlikely. My point is that it was obviously slower and the other 3 looked to be about the same. I don't think this is proper functioning of the ignition system but then I'm no expert. Can any experts weigh in? Is this what the pulse should look like? If not what could be causing this?
Thanks for any and all help,

Mike





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