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Old 08-03-2012, 03:31 PM   #1
mccasksl OP
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Joined: Nov 2004
Location: St. Louis
Oddometer: 61
2004.5 950ADV front cylinder not firing????

My 950 has been down for a while I did the starter clutch upgrade, fixed a number of oil leaks, oil pressure sending unit, rebuilt the leaking carbs, checked valves, replaced plugs, flushed rad, new silicone hoses, host of good stuff on the not quite 20,000 mile 2004.5 bike. Before hand it ran good but often would hit on only one cylinder until cleared out / warmed up etc.


Got it running again but it does not fire on the front cylinder at all. It actually runs fairly strong on just the rear cylinder. It is getting gas as I can see the atomized gas coming out of the jet when running, of course the slide is not moving under throttle. Just no spark at all. I swapped the coil sticks, plugs, tore down the carbs one more time to make sure everything was in order, etc. Still no front cylinder.

Searching the advrider forums I think Ive narrowed it to the ECU or TPS. Although Im not sure how the TPS would impact the front cylinder only even when adjusted thru the range. When setting the TPS, I cannot get the 0.5 volts when closed and 3.5 volts (across yellow / black wires) when fully open per the manual. I measure the voltage in mV and it is linear between closed and fully open. When disconnected from the ECU I do not measure any voltage across the blue / black wires making me thing it is the ECU. It appears there have been a couple 950 folks who have had to buy new ECUs for what sounds to be a somewhat similar problem. Im a bit leary spending that much money for a new ECU w/o more trouble shooting.

Any ideads / recommendations?
TIA

Steve
St. Louis
'05 950ADV
other assorted red, blue, and orange bikes
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Old 08-03-2012, 03:48 PM   #2
Goss
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Sounds so simple but when you replaced the plugs did you feel the plug cap snap into place ?

I had this issue once after changing plugs and discovered the cap was not fully seated. Worked my hand in there and sure enough pushed down with all I had and "snap" it seated.

Worth checking being so simple.
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Old 08-03-2012, 06:06 PM   #3
Tangai
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"When setting the TPS, I cannot get the 0.5 volts when closed and 3.5 volts (across yellow / black wires) when fully open per the manual."

I just checked my TPS and it doesn't work like the manual says. You have to check the voltage between the yellow and ground, not the black wire. Still that would not keep the front cylinder from running. You said there is no fire on the front. Do you mean there is no spark from the front spark plug?
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Old 08-03-2012, 06:58 PM   #4
mccasksl OP
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I'm still trying a few things...

...but sure does look like the ECU. It does not put out 5 volts to the TPS like it is suppose to, no wonder the TPS does not show the 0.5 to 3.5 volts across the yellow / black wires when connected (yes I got the service manual correction TB0458, thanks)). Still trying to make sure the coil sticks are getting the voltage and then ground activates the coil / spark. Yes I'm anal about the connections / dielectric grease etc. and "snap" on coil stick. The manual repeatedly says the ECU cannot be tested with simple devices (i.e. a multimeter?) it must be tested on an ignition stand? ...don't have one of those. Still a few more ideas to try. I know some of the airheads and other bikes have had modern electronics ruined when tig welding the frame or something attached to the bike. The couple few times I've had welding done, yes a few crashes / broken bits here and there, I've disconnected the ECU from the harness so don't think that is it. $600 for an ECU to diagnose by remove and replace ouch?

Keep the ideas coming. TIA

Steve
St. Louis
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Old 08-03-2012, 07:00 PM   #5
mccasksl OP
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yep, no visible spark from the front plug...

...when holding the coil stick / spark plug close to a ground.
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