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2008 ford lobo f150 5.4 v8 low power

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8 months 5 days ago #62900 by Eduardo
2008 ford lobo f150 5.4 v8 low power was created by Eduardo
Hello, need help here please
2008 ford lobo f150 5.4 triton v8
Symptoms: low power at wot
When wot and looking at b1s1 and b2s1 voltages b1s1 is around 800mv wich is rich, but b2s1 is less than 200mv wich is lean, so I assume that's the reason of low power, I checked on scan tool fuel rail pressure actual vs desired and both are ok
I swapped injectors from bank 1 to bank 2 but still the same
I checked vvt commands and duty cycle and compare bank 1 vs bank 2 and both look the same
No catalytic converters and no rear O2 sensors on both banks (customer removed them)
What would be the possible causes to have just 1 bank lean?
Thanks

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8 months 5 days ago #62905 by Chad
Replied by Chad on topic 2008 ford lobo f150 5.4 v8 low power
Have you checked exhaust back pressure? If bank one has a restricted exhaust, that bank will be much richer than the other bank.
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
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