badly-running 954 - Honda Motorcycles - FireBlades.org
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post #1 of 14 Old 01-16-2005, 9:17 PM Thread Starter
 
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badly-running 954

Last week, I managed to foul the 954's plugs while idling it without an airbox or muffler. Or so I thought.

I put new plugs in it today, but it doesn't run any better. No idle. Reduced power. I pulled the plugs after riding about 10 miles, and saw black electrodes. Makes me think it is running rich.

Because the MIL doesn't come on, I want to believe that the ECM is behaving. The shop manual refers to a "fail-safe" mode of fuel injection operation. Could that explain the rich running? BTW, I live at 8400 feet. A default FI map would not assume this elevation.

If the 954 is in fail-safe mode, how do I get it back to normal?

Thanks.

Bob

Last edited by OldBob; 01-16-2005 at 9:19 PM. Reason: two signatures
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post #2 of 14 Old 01-16-2005, 9:57 PM
 
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Re: badly-running 954

Have all the vacuum hoses on? Are all the sensor leads connected. You mentioned having the airbox off. There are sensors on the airbox. Were they off then? Did you connect them when you put it back?

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post #3 of 14 Old 01-16-2005, 10:34 PM Thread Starter
 
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Re: badly-running 954

Quote:
Originally Posted by CBRBob
Have all the vacuum hoses on? Are all the sensor leads connected. You mentioned having the airbox off. There are sensors on the airbox. Were they off then? Did you connect them when you put it back?

Good questions, but I think I have them all covered. Just to be on the safe side, I checked the fault memory. Nothing there.

Bob
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post #4 of 14 Old 01-16-2005, 11:51 PM
 
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Re: badly-running 954

Disconnect the battery for 15mins, Reconnect and try it.

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post #5 of 14 Old 01-17-2005, 1:48 PM Thread Starter
 
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Re: badly-running 954

Quote:
Originally Posted by CBRBob
Disconnect the battery for 15mins, Reconnect and try it.
Tried that. No change.

I'm starting to suspect the ECM. Unfortunately, the shop manual doesn't give any information on ECM diagnostics; just "try a different ECM". That could be a $500 experiment.

Bob
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post #6 of 14 Old 01-17-2005, 1:52 PM
 
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Re: badly-running 954

You only idled it?



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post #7 of 14 Old 01-17-2005, 2:13 PM Thread Starter
 
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Re: badly-running 954

Quote:
Originally Posted by luvtolean
You only idled it?
Yes, but here's the entire story.

I adjusted the valves, and reinstalled the cams. Before buttoning up the motor, I rechecked valve clearances after cranking (with the starter) the motor through a few revolutions.

Everything checked, so I closed the top-end, and attached the wiring. Before installing the air box and muffler, I started the motor just to make sure I had connected everything. It started right up and idled for a few minutes before dying.

When I pulled the plugs, they were wet. I then spayed contact cleaner on them, and wiped them dry.

After reinstalling the plugs, muffler, airbox, hoses and sensors, I started the bike, and rode it (about 5 miles) almost immediately. It ran poorly, and would not idle.

I then replaced the plugs because I thought the old ones were beyond salvaging. Same symptoms. The bike still ran poorly.

Because I had idled the bike without the airbox and its sensors, the IAT and MAP codes (9 blinks and 1 blink, respectively) were stored. I cleared the memory, reconnected both sensors and the MAP's vacuum hose. Same symptoms.

I checked the fault memory, but nothing had stored since I cleared it.

I disconnected the battery for an hour or so. Same symptoms.

Bob
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post #8 of 14 Old 01-17-2005, 3:57 PM
 
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Re: badly-running 954

cams indexed wrong?

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post #9 of 14 Old 01-17-2005, 4:32 PM Thread Starter
 
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Re: badly-running 954

Quote:
Originally Posted by CBRBob
cams indexed wrong?
No, I was pretty careful with that. This was not my first time to pull the cams.

Any idea what I can expect to pay for an ECM?

Bob
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post #10 of 14 Old 01-17-2005, 6:53 PM Thread Starter
 
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Re: badly-running 954

Quote:
Originally Posted by happybob
No, I was pretty careful with that. This was not my first time to pull the cams.
Open mouth. Insert foot.

The inlet cam was retarded by one tooth. Now I'll re-index the cams, and see if it runs better.

CBRBob: Thanks for your help.

Bob
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post #11 of 14 Old 01-17-2005, 8:13 PM
 
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Re: badly-running 954

No problem, your bike was retarded, not you. You asked for help.

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post #12 of 14 Old 01-17-2005, 8:15 PM
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Re: badly-running 954

Quote:
Originally Posted by CBRBob
No problem, your bike was retarded, not you. You asked for help.

Life always looks better through bugs on a face shield.
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post #13 of 14 Old 01-17-2005, 9:25 PM
 
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Re: badly-running 954

Quote:
Originally Posted by CBRBob
No problem, your bike was retarded, not you. You asked for help.
Damn, this guy is pretty good!!

Look, lean, believe!!
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post #14 of 14 Old 01-17-2005, 10:34 PM Thread Starter
 
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Re: badly-running 954

Success!!

After I advanced its inlet cam one tooth, the 954 runs like a new bike. I had no idea the motor was that sensitive to cam timing.

I think there's a "knowledge base" entry buried somewhere in this thread.

Bob
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