Another cracked piston

78f100 · Dec 5, 2013

Both will show up as a contribution fault. It will get you pointed to the correct cylinder to start testing on

Rmartin-97 · Dec 5, 2013

Were doin the compression test tonight. So I'll have some answers.

blk350on20s · Dec 5, 2013

Good luck! I'm sending injector vibes your way lol

Rmartin-97 · Dec 5, 2013

blk350on20s said:
Good luck! I'm sending injector vibes your way lol

I hope so.

powerstroked08 · Dec 5, 2013

May the injectors be failed my son

riest:

LOL

78f100 · Dec 5, 2013

Any results?

Csilva187 · Dec 5, 2013

Hope it works out for ya!

Rmartin-97 · Dec 6, 2013

Cyl 8 is 6% down.

webb06 · Dec 6, 2013

Rmartin-97 said:
Cyl 8 is 6% down.

based on a relative compression from IDS? i would pull the glowplug and check it manually compared to say #2 and see what you get there.

Rmartin-97 · Dec 6, 2013

webb06 said:
based on a relative compression from IDS? i would pull the glowplug and check it manually compared to say #2 and see what you get there.

Ok. But yea that was off ids.

webb06 · Dec 6, 2013

honestly 6% isnt too awful much... cracked piston would show much worse i think

Rmartin-97 · Dec 6, 2013

webb06 said:
honestly 6% isnt too awful much... cracked piston would show much worse i think

I'm wondering If maybe I didn't get one the injectors torqued down and it's blowing diesel back up around the injector.

Dzchey21 · Dec 7, 2013

yeah a piston should show way more than that. Check it manually dont even have to pull the valve cover

Rmartin-97 · Dec 7, 2013

Which ones the number 8 cyl?

forcefed6.4ford · Dec 7, 2013

Iirc rear driverside.

08BIGRIG · Dec 7, 2013

Rear drivers side nearest the firewall.

Rmartin-97 · Dec 8, 2013

Ok u pulled the valve cover to see if maybe I had a loose inj line. There are none leaking. So pulled the injector and the orings look good. Where else could I be gettin fuel in oil. Also I drained the oil and put new in and the miss is gone. I still need to manually check compression. I'll do that tomorrow. Can I have the the washer on the bottom of the injector on wrong?

78f100 · Dec 8, 2013

Rmartin-97 said:
Ok u pulled the valve cover to see if maybe I had a loose inj line. There are none leaking. So pulled the injector and the orings look good. Where else could I be gettin fuel in oil. Also I drained the oil and put new in and the miss is gone. I still need to manually check compression. I'll do that tomorrow. Can I have the the washer on the bottom of the injector on wrong?

You can have the washer up side down, but I doubt that's causing a issue. My truck did the same thing when a injector went, I had white smoke along with a skip. It had about 1.5 gallons of fuel in the oil also. I would change that injector if the manual compression test comes out ok.

Rmartin-97 · Dec 8, 2013

78f100 said:
You can have the washer up side down, but I doubt that's causing a issue. My truck did the same thing when a injector went, I had white smoke along with a skip. It had about 1.5 gallons of fuel in the oil also. I would change that injector if the manual compression test comes out ok.

A injector wouldn't cause my compression to be down a bit would it. If the injector is bad I have another issue causing my compression to be down correct?

78f100 · Dec 8, 2013

I wouldn't put a lot of faith in a compression test like you did. You need to use a actual compression tester on all cylinders. I'm not sure as I don't have the same scanner as you but I can't figure out how it can do a compression test. It must be some sort of a contribution test and a bad injector would cause it to read wrong.
Harbor freight has a decent diesel compression tester.