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09-29-2020, 01:12 PM | #1 |
Senior Member
Join Date: May 2010
Location: maryland
Posts: 183
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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? |
09-29-2020, 01:25 PM | #2 |
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Join Date: May 2010
Location: Largo Florida
Posts: 7,225
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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. |
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09-29-2020, 01:29 PM | #3 |
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Join Date: May 2010
Location: maryland
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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. |
09-29-2020, 01:42 PM | #4 |
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Join Date: Feb 2013
Location: Coatesville, Pa
Posts: 719
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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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09-29-2020, 01:51 PM | #5 |
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Re: low & no spark on #3 cyl
Check your compression to rule that out.
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09-29-2020, 06:18 PM | #6 |
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Join Date: May 2010
Location: maryland
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Re: low & no spark on #3 cyl
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Many thanks. All other inputs sure welcomed. Jim G. |
09-29-2020, 09:20 PM | #7 |
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Join Date: Apr 2018
Location: Mebane NC
Posts: 2,354
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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 |
09-29-2020, 10:56 PM | #8 |
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Join Date: May 2010
Location: Between Seattle & Tacoma
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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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09-30-2020, 09:39 AM | #9 | |
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Join Date: Apr 2013
Location: Northwest CT
Posts: 1,092
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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. |
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09-30-2020, 11:11 AM | #10 | |
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Join Date: Apr 2018
Location: Mebane NC
Posts: 2,354
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Re: low & no spark on #3 cyl
Quote:
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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