'97 Powerstroke stumbles in the morning.

[Gone Huntin']

I just bought this truck about a month ago. It has been fine except for two cool mornings at about 60*about two weeks apart. I got in the truck, pulled out of the driveway and went about 100 feet and it stumbled about 3-4 quick times with no cel. After it does it, it runs fine after that. The oil, filter, and fuel filters were changed this weekend and the last time it did it was this morning. It doesn't do it above 70*.

 

[94f450sd]

most likely the exhaust back pressure valve closing.does it sound like the exhuast it plugged up,hissing?

 

[Gone Huntin']

Not that I can tell, it happens so quick that I didn't even see if the tach fluctuated. It's just like you cycled te key off/on very fast three or four times.

 

[94f450sd]

on the turbo under the intake boot there is a black plug.you can unplug and see if it happens again.sounds like the ebpv wich is normal for it to do that.you can also leave it unplugged,wont hurt anything or set the check engine light.its supposed to force the engine to warm up quicker in the cold weather by closing the exhaust.

 

[Gone Huntin']

If that's normal I don't like it, it'll get you run over trying to leave a driveway on a busy highway. It was cool here again this am, but I let it run for a few minutes before I left and it didn't do it today.

 

[94f450sd]

unplug the black plug on the bottom of the turbo on the drivers side under the intake tube.

 

[Gone Huntin']

It was the cps.

 

[94f450sd]

Strange but not surprising.keep the old one in the glove box.very common problem on the psd