Need help diagnosing

Bob · #1 Mon, February 7th, 2011, 11:43 PM

I have a problem that seems to be random. I am leaning toward injector, but not sure.

Here are the symptoms. Below 0 weather...Truck started great, warms up great, drives fine in town...get out on the highway about 5 miles and it acts like it is trying to gel. Mind you I am running treated fuel. WOT and loosing speed cuts out and missing. I pull over and it idles fine. Get back out on the road and it does it again. I get it back to town have the filters changed and a new EGR installed. Truck runs good for about a week. Then it acts up at a stop light. Warmer weather similar symptom, but on the low end...go to take off and it bogs down, cuts out, misses, blows white smoke and then pulls out of it and clears up. Seems to idle a bit funny. It might do it at the next light and it might not. It then runs great for a couple of days. I drove to work and all was good. Stop to get fuel and when I start it up it idles rough again. Does the same thing leaving the station and the next stop light as it did before. Then no problem for a day or so. It seems to have the trouble on the low end during city driving. It is warmed up shut down then started and run again. Gryphon showing no codes.

History: About 3 weeks ago Bill and I went through FICM and ECM/TCM roll back. It ran great for a week then all this came about. I am currently running stage 3(tow mode) on the Gryphon canned tunes, while Bill works on custom tunes. Injectors are fairly new, 20k or less and the truck has a total of 135K mostly highway and towing miles.

I am going to turn it back to stock for a few days and see how it goes. Any input would be appreciated.

***88Racing*** · #2 Tue, February 8th, 2011, 12:53 AM

Left a note for Cody....

***cleatus12r*** · #3 Tue, February 8th, 2011, 10:56 AM

No clue.

Bob · #4 Tue, February 8th, 2011, 12:41 PM

Thanks guys, Ha Ha Well started great warmed up and drove 30 miles no problems. Shut it off and let it sit for about 1/2 hour. Started, warmed up and drove 30 miles again no problems. It was -15 this morning. So I don't think it is a cold weather issue. I will keep the updates comming until we figure it out. Oh, I have not changed back to stock yet.

eabrust · #5 Tue, February 8th, 2011, 08:21 PM

Did you do remote FICM update, or pull it out/send in/reinstall it? If you removed/reinstalled, are the FICM connectors tight and clicked in?

And if it isn't a new FICM, perhaps check it for 48V, maybe it decided to poop out just after updating (that's how my luck typically is).

Just thinking...

good luck

Eric

Bob · #6 Tue, February 8th, 2011, 09:03 PM

Good point, I did the remote programming so a connection should not be a problem, but the chance that is going out is a good chance. If there was no bad luck I would have no luck at all.

Weent out later today and it did not bog down, but acted like it had a miss, real suttle. I just dont know why it is so random.