chug/buck on decceleration - Diesel Forum -
Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

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post #1 of 3 (permalink) Old 08-03-2011, 07:58 PM Thread Starter
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chug/buck on decceleration

Dad has a 96 7.3, 5spd. Having a problem that I cant figure out (Im a chevy guy so the HEUI system is foreign to me).

Anyway, problem typically happens when hes deccelerating for a redlight. One place almost always does it because you are running 50-60 and this is the first redlight you come to. Come off the gas, and as you coast down with it in gear it will start chugging/bucking like its about to die. You have to push in the clutch and rev it up a bit and its fine. Some days it wont do it at all. Others once or twice, and some days its almost every redlight making you want to turn around and go home.

Also it seems to take forever to crank once its hot. I changed the oil (twice actually) so its rockin new rotella, has a new fuel filter, changed the cam position sensor, what now? Like I said, I am lost with the 7.3 injection system. Truck has <100k on it, so give me some ideas.

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post #2 of 3 (permalink) Old 08-04-2011, 02:10 PM
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If it's having problems starting when hot, I would replace the Injection Pressure Regulator (IPR) o-rings and see where that gets you (the other problem could very well be related). Here's the part number:

IPR O-Ring Kit (for when IPR valve replacement is not required)
(Ford) F6TZ-9C977-AA
(International) 1825806C92


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post #3 of 3 (permalink) Old 08-06-2011, 09:26 AM Thread Starter
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Actually replaced the IPR before (friend is a diesel mech and had a spare new one left over from a project), but it didnt fix the issue. Any other ideas?
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