Originally Posted by
scottt28
1. Popping in the exhaust. I talked to him about spark - plugs, wires, firing order. Plugs are new. He says he didn't crack the insulators putting them in... It seems that everything got put back in places correctly after the rebuild. I looked at it myself. We will look again. excessive fuel can cause this because it blows the spark out. your VE table is asking for a mountain of fuel through the 80-120KPA map then drastically reduces after 120KPA. that's not right. first things first but I would do a comp test, check plugs, check leads, check harness earths on back of heads and confirm fuel pressure is stable. then you need some wideband data to move forward.
2. I thought I heard a rod knock at idle, and I mentioned it. We wrote it off as an exhaust leak or something. Truck is loud. We have to look at that again. check over everything mechanically BEFORE you start making radical changes with a laptop
3. We talked about disabling cylinders by killing injectors or pulling plugs wires to see if Idle would change. I also mentioned a hand held pyrometer might help show a dead cylinder. Harbor Freight has em cheap. hand help IR temp gun is great for picking misfires.
4. FORGOT TO MENTION! I LOGGED THIS THING AND IT NEVER SEEMED TO GO INTO CLOSED LOOP. DOESN'T SEEM CORRECT. IT'S MY UNDERSTANDING THAT THE COMPUTER WILL MANAGE AFRS WHEN IT GOES INTO CLOSED LOOP AND IS USING INPUT FROM FACTORY O2 SENSORS WHICH ARE STILL IN PLACE. I CHECKED IT AT VARIOUS RUN TIMES AND ECTS. FANS WERE ON AND ECT GOT TO 203 DEGREES F. NO CLOSED LOOP. I FULLY EXPECTED CLOSED LOOP AT IDLE AND CRUISE TYPE SITUATIONS AFTER IT WARMED UP. IT WAS 100 DEGREES F IN TEXAS THAT DAY. I EXPECTED IT TO BE IN OPEN LOOP BRIEFLY AT START UP AND WHEN IN PE MODE OR WOT.
IS THAT CORRECT??