Hey all you engine gurus out there.
I've been chasing down sever smoking at startup issue on my 1HDFT. Truck smokes heavily at startup, with thick grey/white smoke that reeks of unburnt fuel. It is especially bad in cool weather and at elevation, and as the truck warms up it subsides to "normal" levels. I must add the truck runs great besides that, no other ill symptoms.
I started with injectors, which checked out to be fine and moved on the to a compression test, where I received some potentially troubling results.
FSM calls for a 498psi, with a low of 350. Mine came in at 410/420 consistently across all cylinders.
Now I did have the head rebuilt not too long ago, I did not follow the FSM procedures to determining the exact head gasket thickness according to the piston protrusion, etc. instead just used the thickest #5 gasket, which was recommended at the time. So it could be that I used too thick of gasket therefore lower the compression on the engine?
What do you all think of those results? Its within the allowable range, but a little concerning that its not closer to optimum.
Could the lower compression be causing the smoking issues I am having? Further exaggerated with cold air causing incomplete combustion until the air warms up?
Also note, I do not have the glow screen hooked up and ACSD deleted, but with comparisons to others who have done that as well on the same engine, with no smoke. Makes me think those should not have much effect on my situation.
My timing was advanced towards the top of the range, I am going to retard it, see if that helps.
I've been chasing down sever smoking at startup issue on my 1HDFT. Truck smokes heavily at startup, with thick grey/white smoke that reeks of unburnt fuel. It is especially bad in cool weather and at elevation, and as the truck warms up it subsides to "normal" levels. I must add the truck runs great besides that, no other ill symptoms.
I started with injectors, which checked out to be fine and moved on the to a compression test, where I received some potentially troubling results.
FSM calls for a 498psi, with a low of 350. Mine came in at 410/420 consistently across all cylinders.
Now I did have the head rebuilt not too long ago, I did not follow the FSM procedures to determining the exact head gasket thickness according to the piston protrusion, etc. instead just used the thickest #5 gasket, which was recommended at the time. So it could be that I used too thick of gasket therefore lower the compression on the engine?
What do you all think of those results? Its within the allowable range, but a little concerning that its not closer to optimum.
Could the lower compression be causing the smoking issues I am having? Further exaggerated with cold air causing incomplete combustion until the air warms up?
Also note, I do not have the glow screen hooked up and ACSD deleted, but with comparisons to others who have done that as well on the same engine, with no smoke. Makes me think those should not have much effect on my situation.
My timing was advanced towards the top of the range, I am going to retard it, see if that helps.