1999 7.3 Rough Idle and Check Engine Light Problem - Ford Powerstroke Diesel Forum
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Old 11-01-2006, 04:00 PM
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1999 7.3 Rough Idle and Check Engine Light Problem

i have a 1999 F350 7.3L powerstroke and it is giving me a rough idling problem. When I go to start it up it seems to struggle a bit getting started then it will idle rough and slow. The check engine light comes on but sometimes when I get up to highway speeds it seems to run a little smoother and the light will sometimes go off for a few seconds but never stays off. I've changed the oil, fuel filter, and air filter recently and even checked the intercooler pipes to see if any of them were loose but they all seem to be fine. What do I need to get to check the codes for the check engine light? If anyone has any idea whats goin on i'd appreciate the info, thanks.
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Old 11-01-2006, 05:01 PM
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I would pull your valve covers and see if the connector on the inside of the vavle cover is coming disconnected...i would say there is an 80% chance that this is your problem
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Old 11-01-2006, 08:04 PM
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thanks marc, i'll check it out tomorrow.
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Old 03-09-2009, 06:05 PM
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Quote:
Originally Posted by nimmo View Post
i have a 1999 F350 7.3L powerstroke and it is giving me a rough idling problem. When I go to start it up it seems to struggle a bit getting started then it will idle rough and slow. The check engine light comes on but sometimes when I get up to highway speeds it seems to run a little smoother and the light will sometimes go off for a few seconds but never stays off. I've changed the oil, fuel filter, and air filter recently and even checked the intercooler pipes to see if any of them were loose but they all seem to be fine. What do I need to get to check the codes for the check engine light? If anyone has any idea whats goin on i'd appreciate the info, thanks.
can anyone help me? I have the same problem.
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Old 03-09-2009, 06:11 PM
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Mine was about a 1/4 spoon worth of sand got in my system
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Old 03-09-2009, 06:13 PM
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i had a similar problem with my 7.3L, ended up being the IDM was dying.
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Old 03-09-2009, 07:34 PM
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Originally Posted by sldghamr View Post
i had a similar problem with my 7.3L, ended up being the IDM was dying.

Stupid question... Whats the IDM?
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Old 03-09-2009, 07:36 PM
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Mine was about a 1/4 spoon worth of sand got in my system

SAND? GOT IN WHERE. I SUPPOSE I GOT DIRT......
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Old 03-09-2009, 07:36 PM
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hah i asked that last week its the injector driver module it is in the drivers side fender well behind the plastic towards the cab and up
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Old 03-09-2009, 07:37 PM
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yeah evidently a cab n chassis with the FILLER HOSE OFF and an idiot guy i bought it from with no FILTER IN IT
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