Rough starts, little white smoke

[Blitanicle99]

2003 6.0, 125k, stock minus straight pipped exhaust...

Seems like when I start the truck, it runs a more rough than usual when I drive it... just shaking and the turbo has trouble spooling (which is normal I understand when cold) but just more than usual.

Also, my truck puffs white smoke when cold just a little bit.

Oh oh oh and is it normal to be able to puff a little black smoke if I just bark the throttle while rolling, almost bogging it for a half second?

[VeeDubTDI]

I don't know about the rough start (injector issue, probably), but the other things point to a bad MAP sensor. When mine doesn't read boost, the truck will soot when I stab the throttle quickly (in gear or in neutral). It doesn't smoke at all when the MAP sensor is sensing boost correctly. I believe that the PCM reverts to a default map when it gets bad readings from certain sensors (resulting in overfueling at low loads).

Might want to poke around a bit, scan for codes, observe sensor readings, etc.

[Blitanicle99]

Originally Posted by VeeDubTDI

I don't know about the rough start (injector issue, probably), but the other things point to a bad MAP sensor. When mine doesn't read boost, the truck will soot when I stab the throttle quickly (in gear or in neutral). It doesn't smoke at all when the MAP sensor is sensing boost correctly. I believe that the PCM reverts to a default map when it gets bad readings from certain sensors (resulting in overfueling at low loads).

Might want to poke around a bit, scan for codes, observe sensor readings, etc.

I think I'll play with the map sensor, when I pulled my edge off I ght have not connected it or could be dirty as he'll