Ecu controls the injection events and is easy to eliminate, could also be a pin not seating in the harness, it seems you have eliminated most everything else. Not sure how a bent pushrod or rod could be intermittent...
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- Thread starter quinton
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Well did compression test on the truck and cylinder 2 showed zero psi... Could a valve be stuck open or is it for sure a hole in piston?
I take that back, if a valve is open, put some air into the cylinder and see if it comes out the intake or exhaust, have to pull manifold IC tube off the bridge
Ya that's what I was talking to him about. It had zero blowby. Oil cap upside down on top of it doesn't move. That's why I was highly doubting hole in piston and wanted to ask you guys to make sure.
Ok so his mechanic put air to it and he said he couldn't here any air anywhere. Any ideas? I'm gonna be messing with the truck this weekend and will put air to it myself.
Valve lash could be adjusted way wrong. Double check that, and then put air into the cylinder. It will either come out the intake, exhaust or oil fill and that will tell you where the problem is.
He put air in it today and see he couldn't hear any leaks anywhere (idk how that's possible it has to go somewhere)
It's totally possible, mine leaks somewhere very slowly and I can't hear it to save my life. I'm not talking about a leak that would affect drivability or power. Is the air leaking out as quickly as he's putting it in?
He said when he did a compression test the gauge never moved off zero. He thought the gauge was messed up but wasn't. I'm not sure more than likely I'll have to do it all over when I get to the truck.
Sort of. You are measuring the % loss across rings, valves, etc. you will always have leakage past the piston rings and hear it out the crank case vent.
Someone else may be able to explain better
Yes but a leakdown tester has 2 gauges, one showing air psi in and the other showing psi held in the cylinder. A small difference between the gauges is ok but only a couple psi.
Yes I know what a leak down test is but that's what I was thinking he did, I figured it was just another way of saying it.