Smoke and rough idle! - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 5 (permalink) Old 10-21-2012, 07:30 PM Thread Starter
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Smoke and rough idle!

I have a 94 CC F-350 w/ Casserly Stage 1 Injectors, A Terminator Engineering HPOP T500, and 5 inch exhaust w/ a 3 in downpipe, everything is stock.
I replaced the glow plugs as well as the GPR, and I found the passenger UVCH had a bad pigtail, So I replaced it.
The truck now runs like a piece, no power and I blow blueish smoke all the time, it gets really bad when the turbo spools, the idle is a little rough, if I unplug any of the four connectors it gets worse. I have taken the time to remove both valve covers and reinspect everything, put it back together no change.
The engine was running like money before I replaced the pigtail and glow plug and relay.
Any ideas would be great, or even better if there is anybody in the New London area who could help would be greatly appreciated.
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post #2 of 5 (permalink) Old 10-21-2012, 09:25 PM
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Re: Smoke and rough idle!

To make sure I understood you correctly, it was running great then you replaced the pigtail, glowplugs and relay? Did it start running bad immediately after doing this work or was it running poorly before, causing you to do this work?

A bad pigtail install could cause a misfire/deadmiss. Any issues getting the glowplugs back out/in (no crossed threads, broken plugs, etc)? I sounds like maybe you need to check your work for something missed.

I want to make sure we're not missing anything... The only thing that I could see here as happening if you had an issue on the plug is a miss. IIRC there is a ground wire around the harness wires, but not sure if it needs to be reinstalled a certain way. Make sure that good power is going through the repaired plug.

2000 F250 CCSB-- GT4294R, 250/100s, Dahl/Fuelab, PHP, scan gauge, stock 17* pump

1994 F250 4x4 SC (sold)
1997 F250 CCSB 2wd (sold)
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post #3 of 5 (permalink) Old 10-21-2012, 10:39 PM Thread Starter
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Re: Smoke and rough idle!

I had a hard time starting in the recent cold weather, so I replaced the glow plugs, and relay. while doing this I found the bad pigtail. I have been over the pigtail about 5 times now, I even replaced the pigtail for a second time. There were no issues with the glow plugs besides Ohming out bad, came out easy.

The truck was running great except for the hard starts in cooler weather. If I unplug the replaced pigtail the engine wants to die the same as removing any of the four plugs. Is there a wiring schematic for the harness to insure I have the correct wires going to the perspective injectors, and I did not accidentally swap the two wires!

There is a ground wire wrapped around the wires and I reinstalled the tin foil, around the wires as they were before I started. I have good power running through the plug, same readings on all four plugs now.
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post #4 of 5 (permalink) Old 10-22-2012, 11:22 AM
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Re: Smoke and rough idle!

Here you go. This is exactly what you need to determine your wiring issues.
Attached Files
File Type: pdf GB_Tech_Bulletin_103_Ford IDM_Module_Replacement.pdf (710.5 KB, 10 views)

97 F-350 XLT CC DRW 4X4 PSD, 285/75-16 Custom bumpers, Gauges-boost/egt/trans, Swamps IDM, 3.5"dp- 4" exh., 3" Body lift, ES bushings/mounts, Built trans, billet conv, B&M pan, Hayden cooler, Adrenaline, stage 2's, IC, H2E, E-fuel
ARP's, 910's, Smith Bros. to come
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post #5 of 5 (permalink) Old 10-22-2012, 07:18 PM Thread Starter
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Re: Smoke and rough idle!

Thank you!!!!! That is exactly what I needed. Really appreciate it.
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