Very rough idle on startup in park not in nuetral??

miaduck · #1 (**permalink**) 02-27-2007, 10:13 AM

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.

**pipelayerjdh** · #2 (**permalink**) 02-27-2007, 04:02 PM

I don't know much about autos, but Welcome to the Forum!

***gbear*** · #3 (**permalink**) 02-28-2007, 08:13 AM

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

***gbear*** · #4 (**permalink**) 02-28-2007, 08:18 AM

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

Jim

miaduck · #5 (**permalink**) 02-28-2007, 08:21 AM

I really haven't had time to do any troubleshooting on it yet. No I have not checked for codes.

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