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The mkiv Supra Owners Club

Diagnoses please


Yarco

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11.6 on BPU is unusual, and may explain the det, normally you would be seeing 10AFR or less, I would check fuel pressure, it could be a tired fuel pump, or fuel pressure regulator faulty, as for the no power I would also suspect the boost pipe of, or a split in one of the smaller pipes to the VSVs etc, or even the MAP sensor.

 

Darren at Whifbitz said mid 11's is ok. To be fair the AFR's hardly changed from stock boost to 1.2 bar. It's got to be a fueling issue, pump, injectors, pressure regulator, it was just an instant failure. It's off to Whifbitz soon for a rebuild, I'll confirm what the issue was once Darren has the engine open. Not looking forward to the bills coming my way :(

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Darren at Whifbitz said mid 11's is ok. To be fair the AFR's hardly changed from stock boost to 1.2 bar. It's got to be a fueling issue, pump, injectors, pressure regulator, it was just an instant failure. It's off to Whifbitz soon for a rebuild, I'll confirm what the issue was once Darren has the engine open. Not looking forward to the bills coming my way :(

 

Not saying mid 11AFR is not OK, just that its more often around 10AFR at WOT with BPU, if the AFRs have not changed then its not a fuelling issue.

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