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Old September 1st, 2016   #171
Wjbertrand
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Quote:
Originally Posted by OTRA View Post
Talked to Ivan about your ECU possibly being fooled to think it should trigger a Fuel Cut event.



Ivan said he doubted it would be the case as the ECU doesn't think about Fuel Cut until dropping about 1000 RPM below your problem RPM.



He sees the cause to be more likely on the side of the switches and grounds rather then ECU inputs from sensors as it is very likely that a disruption on the sensors side would be flagged by a FI fault if they were to happen.



Along the same line, he didn't think it could be a disruption of the TPS signal either (was wondering about it due to your cut off happening repeatedly at low throttle) but offered it would be easy enough to check if the TPS was delivering a smooth linear signal to the ECU, even without having the $1200 worth of ECU troubleshooting harness on hand, but no details on how to do it.....



He said to make sure, he would also look at the Bank Angle switch, which is not listed on the troubleshooting record.



He also mentioned that he has had several instances over the years with electrical issues on different bikes that would magically disappear when replacing the battery, although the battery appeared to be perfectly healthy, under charge or not. As a matter of fact, he now always starts on intricate electrical troubleshooting with installing a new battery, regardless of state or age of the current battery.



No smoking gun but still thought I'd pass that along.


Thanks for the additional information. I forgot to add that I checked the BAS by disconnecting and temporarily by-passing it. Same problem. I have a fuel cut eliminator but have not installed it.

TPS was one of the first things I suspected. The old one put out a smooth voltage ramp as does the new one. But that obviously didn't fix it.

Switches and grounds have been inspected, cleaned or replaced (including the main harness) to no avail.


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Old October 26th, 2016   #172
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Default Re: Ignition problem?

After months of sitting in pieces in the garage, I finally put STat back together. No extra or missing fasteners either - yes I'm that good! The new voltage regulator seems have a bit lower set point than before 13.9 vs. 14.2 V. No big deal. It's amazing how you can rip the electrical heart out of this thing, throw it back together, and it runs as if nothing happened. That's both good and bad I suppose as the glitch is still there. Took it into work today to see if Chris over at Santa Barbara Motorsports is still curious to ride it.

The shame is that other than this glitch, the bike runs really, really well. I synced the starter valves and changed the oil before taking her back out again and I think she appreciates it.

Guess I'll try fitting that Ivan's FCE I have knocking around at some point. Winter is a not a great time to sell a bike so unless I get some kind of offer before then, I'll sell her in the spring. CHEAP.
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Old October 26th, 2016   #173
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Default Re: Ignition problem?

I wish you had better results.


Quote:
Originally Posted by Wjbertrand View Post
After months of sitting in pieces in the garage, I finally put STat back together. No extra or missing fasteners either - yes I'm that good! The new voltage regulator seems have a bit lower set point than before 13.9 vs. 14.2 V. No big deal. It's amazing how you can rip the electrical heart out of this thing, throw it back together, and it runs as if nothing happened. That's both good and bad I suppose as the glitch is still there. Took it into work today to see if Chris over at Santa Barbara Motorsports is still curious to ride it.

The shame is that other than this glitch, the bike runs really, really well. I synced the starter valves and changed the oil before taking her back out again and I think she appreciates it.

Guess I'll try fitting that Ivan's FCE I have knocking around at some point. Winter is a not a great time to sell a bike so unless I get some kind of offer before then, I'll sell her in the spring. CHEAP.
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Old October 28th, 2016   #174
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Default Re: Ignition problem?

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I wish you had better results.
I think we all do. With no final result, this is just a bad problem that will plague this bike forever. If I remember correctly, he's changed/swapped every part but the motor itself. It just doesn't make sense. For something as easily repeatable as this problem is, there should have been a solution. Normally, intermittent problems are frustrating. This one breaks that mold.
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