Cutting out

[Screwy]

Hi guys I would really appreciate some help on this, I have a 99 Busa with a turbo,(the problem was there before the turbo was fitted) I have a brand new PCV (and I've tried another one too with no difference),the bike will run super smooth with AFR steady and fuel pressure steady,then without doing anything she will start to missfire Buck and cut in and out,the AFR goes wild from max rich to max lean fuel pressure is steady (just about) when this happens,then after a while she'll run sweet for a while? Are there any sensors that could be at fault? There's nothing on the F1 codes ether,I'm totally stumped! I really would be most grateful,thank you

 

[dillon]

have you got an alarm fitted

 

[Screwy]

Hi Dillon,no alarm

 

[dillon]

Hmmm then I would go with an earth fault. Sorry Im not much help with electrics. I was thinking alarm because some cut the fuel pump to immobilize the bike, that would explain your A/F going lean. Perhaps start looking at your fuel pump circuit. But first check the bikes earth the one that goes to the starter can cause probs.

 

[sixpack577]

Bump for POWERHOUSE.

 

[POWERHOUSE]

Hi guys I would really appreciate some help on this, I have a 99 Busa with a turbo,(the problem was there before the turbo was fitted) I have a brand new PCV (and I've tried another one too with no difference),the bike will run super smooth with AFR steady and fuel pressure steady,then without doing anything she will start to missfire Buck and cut in and out,the AFR goes wild from max rich to max lean fuel pressure is steady (just about) when this happens,then after a while she'll run sweet for a while? Are there any sensors that could be at fault? There's nothing on the F1 codes ether,I'm totally stumped! I really would be most grateful,thank you

Where are you located?

 

[Screwy]

Located in the UK

 

[POWERHOUSE]

Located in the UK

Can you provide more info about your fuel system setup? Does this bike run four injectors with an FMU, or is this a piggyback? Have you checked fuel pressure at idle and on boost? The more information you provide, the more recommendations and suggestions can be generated . . .