Hi, I have a G16A MPI in my sierra and I have been trying to tuning it (haltech E6X). But recently I noticed cylinder 1 is also very rich (as in black on spark plug) while the other 3 are fine. I have swapped the injectors around with no luck. Just swapped the return line with the breather line from fuel tank and that didn’t help.
So I am at my wits end now, anyone have any idea on the problem.
Would a dodgy fuel pressure regulator cause it? Any help would be great.
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G16A MPI fueling problem
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