It's not the FICM, what next? - Ford Powerstroke Diesel Forum
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Old 07-04-2013, 10:37 AM
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It's not the FICM, what next?

I've read so much about cold rough start issues that I'm getting confused!

I've been having the cold start being rough as some have here - and unless it's plugged in. I checked the FICM with a multimetre and at key on engine off it was reading 48v. At cranking it was about 46-47 and at cold idle was 45.6-45.7. This tells me the FICM is not my problem (I was surprised). I've read bits about the injectors possibly being the problem, but wonder if it might be the glowplug modulator? (I think that was what its called - found that online and read only one place that this could also be another issue)

thought? And thanks!
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Old 07-04-2013, 10:50 AM
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Cold idle at 45.6-45.7v isn't near normal, and though it doesn't violate that 45v threashold - its about to come due for you. I wouldn't discount it being a factor just yet. (this assumes you didn't go with a 53v or 58v FICM.)

What is your fuel pressure right now, or do you not have a method yet to determine that (the updated spring [blue spring mod] doesn't mean you don't need to monitor that).

Further than that, could be something in tuning? So what file are you running, and are you running an FICM tune.
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Old 07-04-2013, 10:57 AM
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are your glow plugs working? how cold is it actually getting?
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Old 07-04-2013, 10:58 AM
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The GPCM (glow plug control module) isn't very common to go out on our trucks. I looked into that when I had the same kind of issues you are having. I had to plug my truck in over night during the summer in order for it to start. It did indeed end up being my FICM that was bad, but my voltage dropped drastically during cranking so it was is to figure out.

Do you have access to a good scanner to pull codes and/or read somethings while you try to crank it?
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Old 07-04-2013, 11:01 AM
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Thanks for being a downer in a way lol A lot of what you mentioned I don't know about honestly. Since I bought the truck I've done egr delete/head gaskets with studs as my only real work. Coming out of winter it was noticeably rough starting without being plugged in. Not sure what the fuel pressure is, and the FICM is factory I believe...48v probably? You've mentioned things I haven't read about yet unfortunately :/
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Old 07-04-2013, 11:04 AM
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Quote:
Originally Posted by Rattlesnake18 View Post
The GPCM (glow plug control module) isn't very common to go out on our trucks. I looked into that when I had the same kind of issues you are having. I had to plug my truck in over night during the summer in order for it to start. It did indeed end up being my FICM that was bad, but my voltage dropped drastically during cranking so it was is to figure out.

Do you have access to a good scanner to pull codes and/or read somethings while you try to crank it?
I guess that's why there's not too much info regarding the glowplug mod. cool...Mine is exactly that; plug it in even in summer and it starts great, unplugged now it's just a bit rough, then rough driving until it warms up a bit. I don't have access to a scanner no, but I will try to get to my brother's (8 hour drive lol) he's a mechanic here...
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Old 07-04-2013, 11:06 AM
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Quote:
Originally Posted by powerstrokeshellback View Post
are your glow plugs working? how cold is it actually getting?
I'm not sure how to check the plugs but will find out for sure. I thought those wouldn't generally be an issue yet (195 000 kms)
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Old 07-04-2013, 11:07 AM
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Quote:
Originally Posted by oilfieldguypaul View Post
Thanks for being a downer in a way lol A lot of what you mentioned I don't know about honestly. Since I bought the truck I've done egr delete/head gaskets with studs as my only real work. Coming out of winter it was noticeably rough starting without being plugged in. Not sure what the fuel pressure is, and the FICM is factory I believe...48v probably? You've mentioned things I haven't read about yet unfortunately :/
Take some time to read through the monitoring and bullet proofing threads in my sig. I feel your FICM is due for replacement (or at least a new powersupply).
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Old 07-04-2013, 11:09 AM
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Originally Posted by colo_dually View Post
Take some time to read through the monitoring and bullet proofing threads in my sig. I feel your FICM is due for replacement (or at least a new powersupply).
wiil do, and thanks. I guess I expected anything 45ish was still a good read...youtube vids were deceiving showing 27-29 v lol
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Old 07-04-2013, 11:16 AM
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You start getting to that 45v area, and you start killing injectors.

I have watched a few of those 27v videos, and it scares me. No wonder the 6.0L has the reputation it has.
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