Problem with my 99

Who knows what goes on inside the mind of a power commander--how does it fake out the ECU, what does it do with sensor inputs, does it inhibit FI codes, etc? It seems that the best you can do is verify all the OEM stuff until you find the culprit or rule everything out until it points to the PC.

 

Not sure what goes on in the Power Commander either... I do know it makes no difference whether it is connected or not. I've tried disconneting it/ reconnecting it twice. No difference.. If anything, it's better with the PC connected.

 

$30 shipped, PM me if you want. But, if the ECU is the problem and you don't have a CA spec bike it's not going to run too well. It should run but power is going to be off. I bought my 49 state ECU for $100 on eBay.

 

Well, I tried VFRCapn's CA spec ECU to no avail. (Thanks, Mike) Everything is the same. It will start immediately if you spray fuel or starting fluid in the airbox. The next thing I am checking is for voltage pulse at the injectors. I know I have fuel pressure and spark. I'm thinking the fuel injectors aren't getting the proper signal to open at startup ( and all the time, for that matter).

 

I have not checked the orange ground buss connection. Where would I find it? And you're so right, It has drug on all summer. Killing me. Thanks for hanging in there with this.

 

Wow. I do know my bike has the upgraded R&R with heavy duty wiring harness.. but.... Maybe there was some damage done before it was replaced. Last night I got intense with the Honda shop manual & meter and I may have tracked the problem down to a bad wire from ECU to TPS. Maybe that wire is damaged at the buss? As soon as I get home from work today I will find out if that's the problem. I cant' tell you guys how much I appreciate all the input.

 

I give up. All three wires from the ECU have continuity from the connector side of ecu and TPS. Anyone wanna buy a used, F'd up VFR?

 

what about the TPOS sensor it's self--i've had lots of trouble tracking down issues with tps because it can be intermittent, working at times and flaky at others, never failing completely. Is anyone around with a known-to-be-good sensor that he can use to troubleshoot this thang?

 

I have swapped out the TPS with one that came on a throttle body setup I got off of eBay. Before installing it, I tested them on the bench. They tested exactly the same and seem to be just fine. I have tried everything I know and all of the stuff recomended here. Including different TPS, MAP sensor, Fuel pressure regulator, a different ECU. I am getting 8 flashes from the FI light ( which the Honda manual diagnoses as TPS. ) One wire is getting the correct voltage one is getting less than spec. but the wires are checking good continuity all the way through the harness... so......?

 

Not sure is the same fault but a few years back mine lost fuel economy mid range and high end power, mine was caused by a front bank pair valve stuck open, ( mine was also backfiring intermittently ) I first fixed it following below Link finding one Pair valve was visibly stuck open then later blocked them all for good.

See below Link to UK VFR site explaining symptoms and fix:
http://www.bikersoracle.com/vfr/forum/showthread.php?t=76563

 

I did check the orange ground buss yesterday. Just didn't mention it.

 

I did try another TPS from a throttle body setup I got off of ebay. I checked the one from my bike and the "new" one on the bench before installation. they checked exactly the same from idle position to wide open throttle. The "new one" did not change anything. Newest development.... I have FI fault light. 8 blinks. TPS fault according to Honda Shop manual. Wires from TPS check good. I get 0.1 volt on the Green wire with orange stripe ( should be 5 volts). This tells me that the ECU isn't sending 5 volts to the TPS on that wire.

 

And... I did check out the orange ground buss and it looks fine.. no scorching or hot spots.

 

there should be an adj to set it up at key on/engine off voltage

 

I'm not sure where an adjustment could be made?

 

are mounting holes not slotted?

 

Mounting holes on tps are slotted. I don't believe tps is the problem.