11.5AFR on idle and cruise

[ollieglanza]

Fitted a walboro fuel pump and still on the standard FPR.It seems since fitting the pump, On idle the car runs rich(11.5-12), however when i give some throttle it leans out to 15. On boost it drops back down again. But crusing at 11.6. What could cause this? Possible the standard fpr cant control the flow from the pump?

 

[Jay]

I'd be looking at the fault codes first to see if there's any clues in there mate. Also worth looking for vacuum leaks as that could cause a rich idle condition.

I saw a Glanza not so long ago doing the same sort of thing, looked like the waxstat in the throttle control unit had failed. He hasn't come back to get it sorted just yet so can't confirm 100%.

Jay

 

[ramses974]

Fitted a walboro fuel pump and still on the standard FPR.It seems since fitting the pump, On idle the car runs rich(11.5-12), however when i give some throttle it leans out to 15. On boost it drops back down again. But crusing at 11.6. What could cause this? Possible the standard fpr cant control the flow from the pump?

the stock fpr can control the walbro fuel pump.I have a stock fpr with a few years with this kind of pump,replaced by a supra pump now, more reliable ... as they said ,take a look at your hose or try to fit again th old fuel pump to see if it all is ok... if all is ok it is the fuel pump that gives too much fuel for your fpr (i think the fpr is failed),if all is always the same problem sure you have a problem with hose,or injector leak

 

[ramses974]

Fitted a walboro fuel pump and still on the standard FPR.It seems since fitting the pump, On idle the car runs rich(11.5-12), however when i give some throttle it leans out to 15. On boost it drops back down again. But crusing at 11.6. What could cause this? Possible the standard fpr cant control the flow from the pump?

try to find another ecu ...

 

[ollieglanza]

cool, cheers for the ideas guys!