Spark plug wire unplug test ? on my ford?

  • Thread starter Thread starter elvis w
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elvis w

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Hello

My probleme is my engine run eraticaly, i did a unpluged the sparplugs wires one by one, and sudenly i notice the that my engine run better on 7 cylynder versus 8 cylinder,

I mean my RPM went down on all cylinder, like it should do, but except on one the RPM goes up ??

Any idea of my probleme??

Thanks
i forgot to say it is a Ford 351M carburator, ignition is right, and compression to, and i recently change the intake manifold, .

thnaks
 
What kind of motor what kind of ignition these are things People need to know about if you want a good answer. How new are the plug wires What wire did u take off and it ran better .


My guess with this limited info is that its the 6-5 cylinder fire sequence and the wires are old and jumping from wire to wire and making a miss fire but when you take the plug wire off it stops the misfire by crappy wires being to close to another.
 
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