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I need a bit of advice here from the ECU boffins. I have done a full rewire on the bike moving the ECU behind the headlight. I had the bike running sweet after the rewire.
Since then I have decompressed the engine and after putting the engine back together I wired up some gauges I have got to replace the stock dash unit. When doing this I accidentally earthed a wire from the dash plug. I think it was the battery power wire for the clock etc on to one of the other dash wires. It blew the fuel fuse and at the time I didnt think much of it.
After finishing wiring up the gauges I have gone to start the bike and it is backfiring and farting and not starting. I have pulled the cams out and put them back in and made sure about 50 times that the valve timing is all good. I have rechecked my wiring and all is good there. All I can think of now is that the ECU might have been damaged in some way when I earthed the wire out.
Has anyone seen an ECU damaged from a similar event? I am sure the valve timing is right so I am running out of options here. Any advice?
There is no strong performance without a little fanaticism in the performer
Sounds like you haven,t put an earth back on somewhere.They do that when something is not earthed.
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Maybe you could try your ECU in another bike, just to make sure it ticks.
I don't recommend you try another ECU in your bike until you are sure it is ok.
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Regards BUSGO
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BUSGO Wrote:Maybe you could try your ECU in another bike, just to make sure it ticks.
I don't recommend you try another ECU in your bike until you are sure it is ok.
yeh trying mine in another is the next cab of the rank.
I have been searching high and low for a missing earth but got nothing yet. I need to study the side stand/nuetral lockout some more. From what I have read, it kills the ignition so there may be something there.
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28-10-2008, 09:49pm
(This post was last modified: 28-10-2008, 09:52pm by Camel.)
If its backfiring then it's got some spark. Are all plugs firing when you turn the motor over. What do you mean by decompressed anyway? Did you put a decompression plate under the barrels?
Is the fuel pump working? Are all the injectors working (you'll feel them click when you turn the motor over).
Those ECUs are pretty tough. I doubt if a quick spark from the dash would have killed it. But then....
Camel
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Camel Wrote:If its backfiring then it's got some spark. Are all plugs firing when you turn the motor over. What do you mean by decompressed anyway? Did you put a decompression plate under the barrels?
Is the fuel pump working? Are all the injectors working (you'll feel them click when you turn the motor over).
Those ECUs are pretty tough. I doubt if a quick spark from the dash would have killed it. But then....
Camel
Yes spacer plate under the barrell.
It seems to be intermittently sparking which could lend itself to a bad earth but it is cranking over ok. Pumps working ok but I still need to check the injectors.
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Maj Wrote:Fried one (750)while wiring something with the ecu powered, electrical pliers bridged live power to the crank position sender, very light spark type click and i knew i let the smoke out....
4 &1/2 hours later i returned from vic wreckers with another ecu and finished the job... with the battery disconnected...
Symptoms were FI code for crank sensor, otherwise the bike cranked fine and gauges etc were fine..
if you upset the electronics they usually let you know with a code..ie fuel pump circuit would have a code if the relay or ecu circuit was a problem but may not recognise a fuel pump , wiring fault or fuel pressure problem after the relay as the ecu has no reference from this point..
I havent got the dash anymore so no codes available. On the bright side, I might get a standalone ECU sooner than expected
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28-10-2008, 10:28pm
(This post was last modified: 28-10-2008, 10:31pm by DAD.)
When you put the cams back in did you line up the marks on the cams and the mark on the crank? Also after you put the cam chain back on did you manually wind the engine over and then check that all marks line up? I know you said that you checked the valve timing but did you line up all markes.
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DAD Wrote:When you put the cams back in did you line up the marks on the cams and the mark on the crank? Also after you put the cam chain back on did you manually wind the engine over and then check that all marks line up? I know you said that you checked the valve timing but did you line up all markes.
Yeh checked it over and over, I was kind of hoping I got the cams mixed up because I am running two intakes but it was all good. Checked it against the manual.
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I have had a few electrical issues since putting in: Illumiglow dash, grip warmers, HID lights, high and low beams. Reckon we have just about sorted it however had a few sparks during looking for earths amongst other things.
The only side effect that I have is that my fuel map has changed. Consumption has increased and she's a bit lumpy when operating at high rev range in say 2nd gear in a sweeper, missing a little. Rweckon the sparking has upset the mapping.
Could that have happened with your map perhaps?
I need to get the shop to remap.
Just a thought. The f*&^ing things are so sensitive to electrical issues.
Max
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Was the 2 inlet cams done at the same time as the decompression.. what timing figures did you use and what method of checking those numbers
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Maj Wrote:Was the 2 inlet cams done at the same time as the decompression.. what timing figures did you use and what method of checking those numbers
No they were done last season and I dialled them in with a degree wheel and dial indicator. Gained about 4mph in the trap.
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Horndog, so I take it the fuel pump is working, as are the injectors and spark plugs? I think the quickest way out of it is to put your ecu on a bike of a trusted friend and check the fault code. I wouldn't put their ECU on your bike until I know what the problem is.
BTW is this a K8 or earlier model?
Camel
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Decompression plate will rotate the cams forward about 3.5 deg , usually probs show as a low rev limit ~7-7500 just stops pulling...so if there close i don't think this is your issue...
have you a factory dash to plug in and see if there is a fault
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