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Discussion Starter #1
I have a 1998 powder special with the 600 efi.  The problem is it feels like it is loading up when you are running around 6500 rpms and below but when you crack the throtle and run the heck out of it dosent seem to be missing and runs smooth.  infact the warmer it gets the worse it seems.  It starts great but the plugs look very wet.  It is like the efi is pumping to much fuel on the low end.  thanks any help would be great.
 

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Explain a little better.  What do you mean by "loading up"?

newf
 

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feels like it is missing or trying to foul the plugs.  One other thing I forgot to mention is the wire on the sending unit by the themstat fell off and I put it back on but it didnot seem to help much, but I was wondering if this could have  messed up the computer and some how it has to be reset.  I read some posts about checking codes but I am not sure where to get this info either.  One other way to explain my interpertation of my problem would be that it seems the same amount of fuel is being pumped no mater what the throttle position is this is why it seems to run much better wide open then at 1/4 to 1/2 throtle.
 

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Things I would check.

- Wiring.  Inspect the wiring coming out of the computer, check the ground wire that is located on the steering rod up by the hanble bars.  Check all of the connectors. Light bulbs too.

The EFI systems have a Limp-Home mode.  It is used if any of the sensors fail.  This creates a over-rich condition and will greatly reduce preformance.  However this system can also be activated if you have a loss in voltage.  For example, pulling out your headlight and tail light will make the efi go in to the limp-home mode.

Check the LED light on the bottom of the EFI computer.
Flashes
1. TPS
2. Water Temp
3. Air Intake
4. Not used in 98, barometer
5. injector failure.

Check sensors.  Air intake sensor.  Water temp sensor, Ignition Sensor. and the throttle postion sensor.  The TPS is a potentiometer (voltage divider) and needs a special tool to calibrate.  This ended up being my problem but I didn't have rich plugs, you do.

I doubt the problem is with the fuel pump.  If anything it may be the presure regulator.

You mentioned water sensor fell off.  The resistance should be 785ohms at .710 volts. (at operating temp 50c/122f).


cheers
newf    
 
 
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