low & no spark on #3 cyl Engine runs rough. While at fast idle I ground tested each cyl and #3 spark was intermittent/absent. All others had stead/regular spark to ground .I replaced the spark plugs with new W16, then the re-timed the engine with test lamp, then replaced the coil, still no improvement. I've ordered new upper dist body and rotor. Hopefully this will be the fix.
Any suggestions on what I'm missing? |
Re: low & no spark on #3 cyl Sounds like it could be a carbon tracked cap/housing. Take a good look at it and sometimes the tracking can be erased.
Also it could be cracked. |
Re: low & no spark on #3 cyl - update! New upper dist body and rotor. Not idles really good now but hesitates to take throttle, running kinda rough coming up in RPM to fast idle +. Hummm, is it time to address fuel demand problem?
All inputs surely welcomed. Jim G. |
Re: low & no spark on #3 cyl Try fattening up the idle mixture a bit. If that doesn't help clean all passages in the carb.
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Re: low & no spark on #3 cyl Check your compression to rule that out.
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Re: low & no spark on #3 cyl Idle mix and compression, good ideas. Two I'd not thought of. Was focused on electrical.
Many thanks. All other inputs sure welcomed. Jim G. |
Re: low & no spark on #3 cyl If a short occurs within the distributor body, it often affects cylinder 3. You'll find out when the new one arrives. If that doesn't help, here's a thread from '17 describing something similar with the #1 cylinder. The OP never circled back to report the fix, though.
https://www.fordbarn.com/forum/showthread.php?t=216127 |
Re: low & no spark on #3 cyl Are you saying you checked the actual spark from the spark plug to ground, or are you saying you just shorted it out and it made no difference on number three. If it’s the latter, then it could be a vacuum leak on the intake.
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Re: low & no spark on #3 cyl Quote:
Come to think of it, I'm pretty sure my original distributor body started arcing from the #3 contact. Interesting observation. |
Re: low & no spark on #3 cyl 1 Attachment(s)
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If replacing the distributor body solves the problem, I hope the OP will run some tests with a multimeter across the contacts on the bad distributor body to see whether the #3 wire has any measurable anomalies. |
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