Very rough idle on startup in park not in nuetral?? - Ford Powerstroke Diesel Forum
 
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post #1 of 5 Old 02-27-2007, 10:13 AM Thread Starter
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Very rough idle on startup in park not in nuetral??

I have a '96 F250 7.3L Powerstroke that starts easily but idles very rough(loping) in "park" but when I put it in "neutral" clears up immediately. Doesn't matter if it is cold or hot. I am in coastal area of Texas with no cold weather to speak of (rarely freezing) If I start it in "neutral" the problem doesn't occur at all. Any ideas? Does this almost every time so I've gotten into the habit of starting it in neutral.
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post #2 of 5 Old 02-27-2007, 04:02 PM
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post #3 of 5 Old 02-28-2007, 08:13 AM
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Just a wild guess

I would research and check the "MLPS" Manual Lever Position Sensor. These sensors feed a signal to the PCM about the gear shift position. I do know there are problems with transmission operation related to this sensor, but I am not real sure that the engine tuning could also be effected. The gas motors change idle speeds with this sensors position. but I just don't not the control stratagy with reguard to diesels.

Jim

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post #4 of 5 Old 02-28-2007, 08:18 AM
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one other thing

Have you checked for codes? If you haven't that would be a real good place to start.

Jim

95 F-250 Extended Cab with 3 Gage Piller Pod and BTS Transmission Super Duty Transmission cooler
74 Jeep CJ-5 304 V8
67 Mustang Coupe 289 V8
2002 Explorer
54 F100 Project Truck
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post #5 of 5 Old 02-28-2007, 08:21 AM Thread Starter
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I really haven't had time to do any troubleshooting on it yet. No I have not checked for codes.
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