so heres the problem, i know my truck runs rich and i have white smoke when im barely on th throttle(less than 2800 rpm) and if im at high rpms(more then 3200) rpms the smoke seems to go away, do yall think that its just unburnt fuel or what cud it be i have a 98 5.9gas with 175k and i havent done the plenum repair but im gonna do it just as soon as i can get ahold of stuff to do the kegger mod and oh yea i only seem to notice the smoke when im on the highway

 

id say its the oil leaking from the plenum to the exhaust, and its burning off....

 

Smoke, or steam? Smell it... Smell sweet?

 

i only see the smoke when im drivein on the highway and it gets worse when its colder and at night, but when im parked and runnin the exhaust smell is really strong and has a little bit of a gas smell, and my exhaust is chopped off right behind the cat if that helps any

 

oh yea and when it does it at night sometime its so bad that cars behind me cant see, but it dont always smoke that bad

 

Could be plenum gasket but more than likely its gonna be an oil leak. I would try and get the compression of the cylinders checked. might have a couple that are lower than others.

Josh (users other half...lmao)

 

if its an oil leak my first thought would be rear main seal

 

Rear main wouldn't cause the smoke. Does your truck smoke at start up? Does the smoke go away after you drive for a bit? have you checked the plenum?

I just did the plenum repair a week or two ago. Sometimes my truck smokes, and sometimes it doesn't. I suspect I still have an oil consumption problem as well..... The smoke I am seeing though, is accompanied by a fair bit of moisture blowing out the exhaust. (Not coolant though, I tasted it it to be sure....)

 

well hea said he has the exhaust chopped, so if some of the oil is hitting the exhaust, , then it will smoke around the same area where its chopped.

 

What color?