Cold hard start, troubleshot with no change.

[jrv8984]

The truck takes forever to start now that its cold, I have gone through all the pinpoint AF8-16/17 tests, and have not found anything wrong. I swapped out the GPCM, and still no change. The FICM was rebuilt less than a year ago.
Getting codes P0670, and P0683.
I have pulled the connectors off of 2 of the glowplugs to test the resistance between the pins and the negative battery terminal, I get 0.0 for a reading from 4 pins on 2 of the glow plugs.
This truck is really pissing me off. I don't want to take it to a stealership for them to look at it.
Does anybody have any ideas?

Thanks

[kendallcschm]

what kind of oil are you running? maybe its too thick for where you are.. a video would be helpful... if you have a block warmer plug it in and see if she starts faster

[jrv8984]

I am running the Valvoline blue 5w40, yea plugging the block heater gets it to start up.

[kendallcschm]

Originally Posted by jrv8984

I am running the Valvoline blue 5w40, yea plugging the block heater gets it to start up.

then it seems she's fine.. my 6.0L takes a bit to start if you don't plug in the heater, you could try putting rev-x oil additive in and a winter fuel additive with anti-gel and cetane boost to see if that makes a difference

[Gettin Stroked]

How old are your batteries. Even if they test well they may be too old. 6.0s go through batteries like women through shoes... Make sure they are good and fairly new 'cause even if your FICM was recently rebuilt a bad set of batteries will kill it quick.

[jrv8984]

Batteries are less than a year old.
It takes probably close to a minute to get it started, when it has been sitting and I havn't been able to plug in the block heater.
I have codes p0670, and P0683.
maybe the gpcm that I swapped out was bad also.

[kendallcschm]

Originally Posted by jrv8984

Batteries are less than a year old.
It takes probably close to a minute to get it started, when it has been sitting and I havn't been able to plug in the block heater.
I have codes p0670, and P0683.
maybe the gpcm that I swapped out was bad also.

i thought you had said you FIXED that issue.. have you tried a module out of a truck you know works?

[jrv8984]

Yea I thought It was fixed, but its back. So I must have missed something, and it was just a fluke that it was working.

[southend]

Load test your batteries, perform ficm test procedure.

Sent from my phone that somebody didn't help me get.