Very enlightening for my own issue with a 4.3 V6 Vortec in a Chevy Express 1500. Same codes. Doesn't run rough at idle or part throttle at all but if I get on the freeway and give it a lot of throttle to get up to speed it seems to have no power at all. Can barely get to 55 mph. I've checked all the simple stuff I could think of. Air filter, vac hoses etc.
@deathwishproject4700
2 жыл бұрын
I was fighting excessive fuel trimming on mine for a while, one of my o2s went dead and it was fouling my plugs like crazy. I tried cleaning them but it eventually completely went out
@BurninGas8.1
2 жыл бұрын
Yea small air leak was my culprit
@mhotrodscooter
2 жыл бұрын
@@BurninGas8.1 my header flanges alway get loose and make truck run stupid and foul plugs
@BurninGas8.1
2 жыл бұрын
@@mhotrodscooter yup for sure
@BurninGas8.1
2 жыл бұрын
My leak was barely noticeable I mean super tiny but only 2 inches from sensor caused major headache she is workin so good now and 175 kms on first quarter tank so a new fuel mileage video will probably be coming because 175 km befor would be half a tank lol
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