? Mefi 3

2001 , 4.3 , tbi, mercooler fuel pump, mefi 3.
2 reman, motors, first motor detonated # 3 piston (dime size hole) 40-60 hrs. 2nd motor , scoured #2, in 30 some hrs. Only thing I found was a lifter tick, and no oil to top of rocker arms. On number 2 cylinder on starboard side These are reman. motors.
Q if regulator on return side of cool pump goes bad, is it possible that tbi can over fuel, I'm setting timing with CDI software, in base mode.
I have recorded print out of what info I can get. Any info would be appreciated. THANKS

I'm at a not understand point, doesnt mefi control , tbi injection pulses? Or am I missing timing advance?

the MEFI-3 controls injector pulse width....and can control the timing....and retard the timing as well - all driven by the sensor inputs and the code embedded within....has anybody verified the knock sensor is functioning?

Where are you buying your long blocks from?

Jasper.

Offfffffffhhhhh

Question if fuel regulator on return side of cool pump goes bad . Would tbi over fuel ?
And if regulator is bad , it should be a issue before say 30 hrs. correct. Both reman motors were bored .040. Both motors overheat plugs were green. Reman company says possible , air pocket in water jacket , it's not a closed coolant system. Then said lean condition ( intake crack) new intake. 1st motor #3 , 2nd motor#2 opposite sides. Then they said pcv valve bad.
I said so your reman has bad rings? To creating so much blow by. I told them if motors had that kind of blow by I would have seen. I was tired of talking to the guy. Because he was reading from computer. Fact is we're not paying and I have customers break in history.
Is there a possibility that crank is not splashing enough oil under pistons? Any advice would be appreciated. But probably want because I said there name. Thanks

What drive?

Alpha 1 gen 2