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Re: Lean Bank1 and Bank 2
I will have my tuner look into which fuel system the ECU is programed to.
I did remove the ECU from my 78 which is the same year 5.3 and swapped them.
The 78 does not show any codes and the ECU in the 46 now is still showing codes Lean 1 & 2
I am leaning towards the FPR OR the intake gaskets.
I will do some more troubleshooting next week when we change parts and spray the intake with carb cleaner and look for RPM increase
Thanks folks for your help, we will get to the cause!
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78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42
2000 S-Type 3.0 (wife cruiser)
2003 GMC SCSB 5.3 4L60E 3:42
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