colder exhaust at idle
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Stage II
Joined: Jul 2018
Posts: 2
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From: Tacoma, WA
colder exhaust at idle
Hi Everyone. I have a rather strange issue. I have a 1998 FXDWG with an Evolution engine. It ran fine for years, but lately has developed a perplexing problem. At idle, the front cylinder exhaust pipe it only lukewarm. I mean, you can grab onto it without an issue. The rear cylinder is hot, and would melt your hand if you grabbed it. When I really give it throttle, it seems like the engine responds normally, and there is plenty of power. I did a compression check, and both cylinders have the same readings. I swapped the coil wires to the spark plugs, and nothing changed. It has a single carburetor, so both cylinders must be getting the same fuel. So, we have spark, compression, and fuel, but the front cylinder still seems like it is not working at idle, since the exhaust pipe is only warm to the touch. What am I missing? Any suggestions?
Road Captain
Joined: Sep 2012
Posts: 675
Likes: 32
From: Massachusetts
dualfire coil?
im assuming you've tried swapping plugs, but did you swap the leads @ the coil? (if its dual-fire, it doesnt matter which one plugs in to which socket)...might have a coil going bad
im assuming you've tried swapping plugs, but did you swap the leads @ the coil? (if its dual-fire, it doesnt matter which one plugs in to which socket)...might have a coil going bad
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Stage II
Joined: Jul 2018
Posts: 2
Likes: 0
From: Tacoma, WA
Update
I did swap coil wires and even the plugs. As I said, I have spark as indicated by a spark checking tool. I just do not understand why that front exhaust pipe is only warm to the touch. It has spark, compression and fuel.
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Cruiser
Joined: Aug 2008
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From: Rotterdam, Netherlands
Yeah, this. Mine ran on one cylinder when my rear pistons rings went south, and eventually it wouldn't idle at all. It revved down, stumbled for a couple of seconds and die.
Last edited by Daedalus; Jul 22, 2018 at 02:28 PM.
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