Cranking it by hand usually catches it. It would always surprise me because I would have the marks lined up (I thought) and then hand crank it a few revs and it would show up a tooth off (happened once maybe twice). I guess one side had slack the other tension, but cranking it allowed me to verify.
Yeah that would be a pain. I'd prob triple check every other thing first! lol

 

If that is the problem I guess I am lucky to have a cam swap planned. I guess I will triple check next time. F**k sakes

 

Sorry guys I left for a bit. Can you feel it missing? If the compression is all within 10-15 psi then it is something else. Check for vacuum leaks. Intake gaskets for sure. Doubt timing because there will be a compression variation. Regular tests. Swap plugs and injectors of course. Easiest way to eliminate intake is run a little water over the gasket mating surface at 1 and 2 cylinder while running. Should notice a difference if it is. Fuel pressure possibly. 02 sensors may also cause it. Are you still running cats also? Could have damaged one when it blew.

 

I was thinking timing could still be an issue - if it was just a tooth off. Because you are checking compression of each cylinder independently - and observing the highest pressure on the guage (though not necessarily at exact TDC).

Also, the error codes are only on one bank. Is that the same bank that has the new head?

 

Could still possibly be. I've seen a tooth off show compression variations more often than not though. Wondering what the fuel trim is showing on both banks. Might help.

 

Is that a pressure test?

 

No. Long term fuel trim for both banks on the scan tool. If more positive or negative on either bank, could help to see if the PCM is compensating for a air/fuel problem. Just helps narrow things down.

 

K yes problem is on the new head. As far as a vacuum leak I took it to the car wash and soaked the motor hoping to feel a difference and getting it wet didn't change anything. Could a clogged fuel filter be my problem. I bought one anyway. I already did the cops and plug switch on cylinders that weren't coding.

 

You still may have ruined a cat also. If a piston blew then something probably hit it too. If you still have cats. Just another thought.

 

I still have the cats but they are punched out and the rear o2s are off. I blew out a plug. The piston and wall looked unscathed. I get no pull over 4000 rpm. How do you get the fuel filter

 

They tucked it in there for sure. Relieve the pressure first at the valve on the fuel rail. Then get some rags in hand. A lot of swearing is also helpful.

 

Oh. I found it right behind the tank. How do I get it off. I bought the dumb little tool from part source and broke it. Now what

 

Got to get another tool man. Any parts house should have them.

 

Duct tape FTW!!

 

Ha....yup

 

YO. Did you get the filter changed out?

 

Yup. Mud came out the end of it. No cel but still getting a random misfire code. And it's a turd past 4500 rpm. I am really thinking cam not degreed right and I am off a tooth. I need cam gears if you come across a pair. They van come off Romeo heads

 

How long will it take to tear it back down to check the chain? I guess it could be the problem. Just never ran into that one.

 

Well for a real mechanic prolly a few hours. For me a couple days. Hehehe. So I found a 2004 f250 with 160k miles. Turbo diesel for 8k. I think I can flip it and make a buck. Wadaya think. Do you know anything about these trucks

 

Nothing about them. My ford experience is more limited than on gm and Chrysler. I'm still not thinking that is what your problem is though. Do you have a scan tool. If so see what the LT fuel trim is showing after it has been running for a while. Should have a left and right bank reading.