Very smokey startups
Lead Driver
Joined: Apr 2016
Posts: 7,203
Likes: 1,340
From: Bahstun
cant measure GPs OHM when harness is connected since its a parrlell circut and the lowest one gives you a reading.
there should be about .1 ohms at the GPR between the two big posts, higher than .1 and you have a GP that is burnt out.
Measure the GPs OHMS at the UVCH unlugged to ground
there should be about .1 ohms at the GPR between the two big posts, higher than .1 and you have a GP that is burnt out.
Measure the GPs OHMS at the UVCH unlugged to ground
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Laughing Gas
Joined: Sep 2012
Posts: 1,239
Likes: 104
From: idaho
cant measure GPs OHM when harness is connected since its a parrlell circut and the lowest one gives you a reading.
there should be about .1 ohms at the GPR between the two big posts, higher than .1 and you have a GP that is burnt out.
Measure the GPs OHMS at the UVCH unlugged to ground
there should be about .1 ohms at the GPR between the two big posts, higher than .1 and you have a GP that is burnt out.
Measure the GPs OHMS at the UVCH unlugged to ground
Lead Driver
Joined: Sep 2002
Posts: 9,540
Likes: 2,031
From: North Texas
If starts at 55F not plugged in, most if not all GPs are working. Mine would not start under 60F with the GPR unplugged. 65F was about the threshold for mine.
Plugging in is a quick test. 3-4hr seems sufficient to me.
Plugging in is a quick test. 3-4hr seems sufficient to me.
Logistics Pro
Joined: Mar 2007
Posts: 4,580
Likes: 839
From: knoxville, tn
I am not in agreement with this. My GPR is currently disconnected and it seems to start fine so far down into the 50s without any help. I think compression has an impact on it.
sounds like you are testing the GPS correctly
sounds like you are testing the GPS correctly
Lead Driver
Joined: Apr 2016
Posts: 7,203
Likes: 1,340
From: Bahstun
OK that is good to do it that way.
Laughing Gas
Joined: Mar 2021
Posts: 1,118
Likes: 425
I'd recommend doing a running compression test vs just a standard cranking. You can get perfectly fine cranking numbers across all cylinders even if dusting/wear has occurred to the extent that it's causing problems. IIRC you want to see ~600-650 PSI.
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Laughing Gas
Joined: Sep 2012
Posts: 1,239
Likes: 104
From: idaho
How long does it take to stop smoking?
Plug it in then see how the morning start goes. If it changes it then you may have gp system issues still.
If the truck runs ok after a lil heat and does the job needed, how far do you really need to go? It may not be perfect but at almost 25 years of use...none of em are. Just playing devils advocate here.
Plug it in then see how the morning start goes. If it changes it then you may have gp system issues still.
If the truck runs ok after a lil heat and does the job needed, how far do you really need to go? It may not be perfect but at almost 25 years of use...none of em are. Just playing devils advocate here.
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Cargo Master
Joined: May 2018
Posts: 2,442
Likes: 993
My OBS smokes just like yours. Cold calm mornings it will be a plume that could cover over half a football field. It uses a little bit of oil but no more than my other 7.3s that don't smoke. It has a raw fuel smell that will burn your eyes but always goes away once warm. Oil cap blow-by is zero and won't push the cap off the filler neck even at 3000rpm. Good glowplugs and will start in sub 0 temps no problem. No lack of power or other symptoms. It has smoked like that for over 15 years. Always thought it was fuel timing. 
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Laughing Gas
Joined: Sep 2012
Posts: 1,239
Likes: 104
From: idaho
My OBS smokes just like yours. Cold calm mornings it will be a plume that could cover over half a football field. It uses a little bit of oil but no more than my other 7.3s that don't smoke. It has a raw fuel smell that will burn your eyes but always goes away once warm. Oil cap blow-by is zero and won't push the cap off the filler neck even at 3000rpm. Good glowplugs and will start in sub 0 temps no problem. No lack of power or other symptoms. It has smoked like that for over 15 years. Always thought it was fuel timing.
well. This is reassuring. 😆
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Laughing Gas
Joined: Sep 2012
Posts: 1,239
Likes: 104
From: idaho
Pulled the turbo yesterday. No major Leaks. Possibly on the compressor side. But I can’t tell whether it was the seal or CCV. I snapped 2 bolts pulling the turbine housing. Ordered a new one after failing to extract it. Broke 2 extractors. Turbine housing and housing was a B to separate.
I don’t see any obvious issues with it. But hopefully fresh seals helps the smoke. Also grabbed a RR diesel 4/4 compressor wheel and a western snow plow GPR. 360° thrust bearing rebuild from RR diesel
I don’t see any obvious issues with it. But hopefully fresh seals helps the smoke. Also grabbed a RR diesel 4/4 compressor wheel and a western snow plow GPR. 360° thrust bearing rebuild from RR diesel
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Laughing Gas
Joined: Sep 2012
Posts: 1,239
Likes: 104
From: idaho
Also, does anyone have any tips for getting the t4 bolts tight on the turbo when I re install? I pulled the turbo a few months back to do the up pipes. And the 2 lower bolts weren’t loose. But they also didn’t take much effort to break loose. The new bolts with the up pipes are 13mm. So I used a box end wrench to get in there this time