Just bought a 02 f-250 7.3 with 115k miles. Acouple days after I bought it I noticed a lot of white smoke on cold starts for about 20-30 sec at 50 degree temperature. So I tested the GPR which ended up being bad a replaced with the one that is double in size(name escapes me atm) and also did the 50 cent mod to keep the through-valve cover harness from lossing connection since both sides were lose.After that the temp warmed back up and it would only blow a "puff" of white smoke. The past two days it has gotten down to 30-32 and the truck has a rough time starting. Cranks fine but it's almost like it's getting choked or flooded then it will blow smoke for 3-4 minutes after it starts. The truck does have a FASS fuel system on it with stock injectors. Should I try to Ohm out the glow plugs again or where should I start trouble shooting? Thanks.

 

Start with the individual glow plugs - test them at the harness. Even 2-3 that are burned out will greatly affect cold starting. Switching to Rotella T6 synthetic oil will greatly help cold starting, too.

 

The truck has had Rotella synthetic in it since new every 3k miles. I'll try to ohm out the glow plugs when I get home from work and report back my readings.

 

So I messed with the connectors last night and ohmed out each plug. On the left front to back read
.5
.7
OL
OL
OL
OL
.4
.3
What does it mean if I'm getting Open-Loop on all my injectors?
And on the right side I couldn't get any readings due to the fact that the connector appears to be aftermarket (blue in color with much smaller openings, where as the the left side is black with bigger openings). Not sure if this is part of the issue or what.