Misfire Eratic engine

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Oct 7, 2008 | 09:20 AM

caorig

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Intermediate

Joined: Aug 2007

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Misfire Eratic engine

Recently took a trip from the Oakland Ca Bay Area to Street vibrations. Upon arriving in Reno my 98 ultra classic with fuel injection and a power commander started running strange (idle would drop down to say 500 rpms and then I would turn it off and restart it and it would race at say 1700 rpm. Through all this it ran really good but idled strange. Upon returning home I put the bike away, and attempted to start it the next day and it had a hard time starting and once it started it was running on what seemed to be one cylinder at times then both cylinders very erratically. I tried new plug wires and checked battery connections as well as inspecting the spark plugs but still having the same problems. Any ideas what this could be?

Oct 7, 2008 | 09:24 AM

dougbk

Road Master

Joined: May 2006

Posts: 1,229

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From: Greater St Louis, MO

Remove the power commander and go directly to the stock ECM and see if it works right. If so you may have a bad PC III.

Oct 7, 2008 | 09:50 AM

PeteMII

Novice

Joined: Sep 2008

Posts: 18

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From: Ohio

Had that happen to my '00 and it was bad fuel. Seems my M-M EFI doesn't like the blend of BP gas around here.

Not saying that's it, just been my experience