White Smoke at idle when cold / rough run at idle when warm - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 04-03-2008, 11:04 AM   #1 (permalink)
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White Smoke at idle when cold / rough run at idle when warm

Does anyone have experience with this?
Starting the engine (PSD 7.3L, year 1999 (05/98) in the morning a lot of white smoke comes out of the pipe. At higher rpm (more than idle) white smoke stops. Coming back to idle white smoke is again there until the engine gets really warm.
Waiting at stoplights (at idle) engine runs rough even if engine is warm! White smoke with warm engine has disappeared.
Many thanks in advance for any hint about what we could do.
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Old 04-03-2008, 12:46 PM   #2 (permalink)
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couple bad injectors? loose injectors? bad tunning? fill out your sig to tell us what truck you have and whats done to it.
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Old 04-03-2008, 12:52 PM   #3 (permalink)
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We have 209000 Miles on that engine. Changed the injectors with 180000 Miles. Changed Glowplugs and GPR recently. Fuel Filter changed. Regular service always done.
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Old 04-03-2008, 12:59 PM   #4 (permalink)
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what about glow plugs? that could be a problem for the morning starts. alright sounds like you might have a air leak in your fuel lines.
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Old 04-03-2008, 01:06 PM   #5 (permalink)
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Glow Plugs changed two days ago!
If it were airleak in fuel lines - wouldn't it always smoke?
We recently had also a vacuum on the tank - we cleaned the tap (with key) - and we had the impression there was less vacuum - need to monitor longer for that.
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Old 04-03-2008, 01:21 PM   #6 (permalink)
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did you notice this right after you did something or just all the sudden truck running like crap?
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Old 04-03-2008, 01:30 PM   #7 (permalink)
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It smoked always little, but we have the impression that it becomes stronger, especially waiting (idling) at redlights. Two days ago, when GP were changed, the mechanics had to remove one cap of the injectors (only of one) because they had to remove the old glowplug. Could this have any influence?
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Old 04-03-2008, 02:42 PM   #8 (permalink)
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sounds more like injectors. does the truck ever feel like it is skipping on you
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Old 04-04-2008, 02:29 PM   #9 (permalink)
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What do you mean with "skipping on you"?
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1999 (05/98) Ford F350 Super Duty crew cab, long, 4x4, 6 speed manual transmission, manual hubs, double rear wheels, 239000 miles, 30000 miles on new 7.3 L DIT engine, heavy duty usage in the Andes of South America (Argentina & Chile) = many gravel roads, a lot of dust and many very bumpy paved roads
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Old 04-04-2008, 07:28 PM   #10 (permalink)
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You can check the IPR o ring ,,,the small one on the end ,,may have a cut in it ,,,a cheap test , you can tell by looking at it ,,,

you can also ,unplug the ICP ,,see if the Idle smoothes out ....

You may need a new IPR altogether ...
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