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Problem Starting Bike When Engine Is Cold
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Question Problem Starting Bike When Engine Is Cold - September 16, 2010, 02:44 PM

What's up Fellas i'v been having a problem with my bike every since i got the new full exhaust put on with the M4 GP Can and Power commander. What is happening is when i start the bike up when the engine is cold (only) it stalls on me. So what i have to do is rev the throttle and hold it to keep the bike from stalling about 3,000 rpm's. Once the engine is hot about 180 degrees it eventually it will idle on it's own. Never had any problems with my bike til the new system was installed. I thought having it dyno would fix the problem but it still stalls when engine is cold. Please help me find a solution to this problem.
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September 16, 2010, 02:50 PM

I say it all the time. The little Japanese guys who design our bikes know what they are doing. Don't fuck with it.
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September 16, 2010, 04:04 PM

Was the power commander tuned for your setup? You can't just throw it on there and figure that it will work itself out.


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September 16, 2010, 05:18 PM

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I say it all the time. The little Japanese guys who design our bikes know what they are doing. Don't fuck with it.
have it dyno tuned. your idle might be set to too low is a possibility.


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September 17, 2010, 08:21 AM

The mechanic put it on the exhaust system & power commander, i don't know if he did anything to the power commander when he put it on. I just got it dyno tuned 2 weeks ago and that did not correct the problem. I told them to check to see if the idle was too low. I'm going to have to call them up and take my bike back out there again. BIG INCONVIENCE running back and forth out there.
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September 17, 2010, 08:27 AM

two things, either your ICV (idle control valve) or your idle is set too low

also where did you take the bike, who tuned it


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chumchum: my front is stiff and my rear is lose

#452-LE: I feel like jelly....... cauz jam dont shake like this!!

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September 17, 2010, 08:41 AM

When it finally does idle, what does it idle at?


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September 17, 2010, 02:17 PM

I took the bike to MRP Motorsports in Pasedena Md. Ritchie HWY. to get it dyno tuned. When it does idle on it's own it's around 1000 rpm's.

Last edited by Bmore_gsx-r; September 17, 2010 at 03:00 PM..
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September 17, 2010, 02:20 PM

jesus, 2k at idle, most bikes idle around 1200 +/- 100rpm


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2002 RC51-Ask and i will tell
1977 Harley-Davidson FLH (gettin a face lift)
2006 cbr1000rr-(sold)
2000 929- (sold)
2002 R1- (sold)

chumchum: my front is stiff and my rear is lose

#452-LE: I feel like jelly....... cauz jam dont shake like this!!

----------Alexandria, Va----------
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September 17, 2010, 02:29 PM

yeah, that idle seems a little to high


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September 17, 2010, 03:01 PM

My bad it idles about 1000- 1200
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September 17, 2010, 03:36 PM

Okay that idle is normal, so your idle isn't set too low.

Just changing the exhaust, in my experience or those I've heard of, can't change an otherwise perfectly running bike's mixture so much that it won't idle when cold.

So, either;

-Your idle control went bad at the same time your Power Commander was installed
-Your Power Commander was installed improperly
-Or you've got a bad Power Commander software setup.

The first thing I would do is whip out my manual, find out where the idle control valve (ICV) is, and make sure it's actually connected. Sometimes it's called the Idle Speed Control (ISC). That device is most important for idling when it's cold outside or when the engine is cold.

I personally don't have any specific Power Commander experience so I can't speak on it's installation or configuration. If you've got any documentation on it, read through that and verify that the electrics are all actually connected correctly.

If all of those are correct, frankly I would remove the Power Commander completely and get the bike running reliably without it. Once you've got a solid foundation back, re-introduce the Power Commander.

Troubleshooting is all about isolate and verify. Internet guesses are rarely accurate.


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