Need Help diagnosing smoke
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Mountain Pass
Joined: Nov 2014
Posts: 132
Likes: 4
Need Help diagnosing smoke
My truck is a blue white smoke mosquito fogger when cold. Smoke seems to lessen after one good acceleration and goes away completely once up to full operating temp.
Engine has about 175k on it even compression on all and very little blowby. Also can not notice any oil consumption.
In the last 2 months it has gotten baby swamps, glowplugs, gpr, cps and EBPV delete. I also rebuilt the turbo.
If the truck sits a few hours or is at a temp below 1/2 on the gauge faint blue smoke come back. Today it was 25F out and it started ok being unplugged. All glowplugs ohm out in spec and are getting 12V.
Any ideas? I'm wondering if I could have a seal not right in my turbo, or if there could be an issue with one of the injectors?
Engine has about 175k on it even compression on all and very little blowby. Also can not notice any oil consumption.
In the last 2 months it has gotten baby swamps, glowplugs, gpr, cps and EBPV delete. I also rebuilt the turbo.
If the truck sits a few hours or is at a temp below 1/2 on the gauge faint blue smoke come back. Today it was 25F out and it started ok being unplugged. All glowplugs ohm out in spec and are getting 12V.
Any ideas? I'm wondering if I could have a seal not right in my turbo, or if there could be an issue with one of the injectors?
Lead Driver
Joined: Apr 2016
Posts: 7,202
Likes: 1,340
From: Bahstun
diesels smoke when cold, worse when injector armature clearance is too tight as it retards the timing but with those new swamps it shouldn't be an issue but don't rule it out
could have a turbo seal going but I would think it would use some engine oil after a while
could have a turbo seal going but I would think it would use some engine oil after a while
Thread Starter
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Mountain Pass
Joined: Nov 2014
Posts: 132
Likes: 4
I've got two neighbors with the same vintage 7.3 and I never see their trucks smoking.
Thinking I will put the ebpv back on the next time I'm in the turbo. It will clear up in 6 miles if I drive it hard.
Thinking I will put the ebpv back on the next time I'm in the turbo. It will clear up in 6 miles if I drive it hard.
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Mountain Pass
Joined: Nov 2014
Posts: 132
Likes: 4
Neighbors probably are stock. Running baby swamps and swamps tunes. Also no cat. Tunes are stock, hi idle, std, mpg, hot, extreme. See no difference with smoke in any setting. It just seems kind of silly to smoke out the neighborhood or drive like a nut to clear it up. I love driving the truck otherwise. Would a leaky injector do this?
Cargo Master
Joined: Jul 2015
Posts: 3,076
Likes: 21
From: Aransas Pass, Tx
Is the truck running smoothly? I have swamps tunes for my stage 1 sticks and they haze until warm when I start below 30.
Does the smoke smell like diesel? Exhaust? Coolant?
Does the smoke smell like diesel? Exhaust? Coolant?
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Mountain Pass
Joined: Nov 2014
Posts: 132
Likes: 4
Mine puts out more than a haze and doesn't seem to matter much what the outside temp is, just if the engine is cold. It seems like a slight miss on one cylinder when cold, and it seems to smooth out after I get on it once to about 2500 rpm. Almost feels like something is burning out on that first acceleration.
It seems like I get less of a response when unplugging cylinders 5,7 compared to the others. But I haven't used any kind of tester.
Once it is warm in runs smooth and no smoke. I don't know if I'm crazy, but the smoke seems less if the truck was parked on an a different angle, like with the nose down on an incline, or leaning on the drivers side.
I am going to try new wiring to the valve cover gaskets as a couple have broken clips and it doesn't seem like it would hurt anything.
It seems like I get less of a response when unplugging cylinders 5,7 compared to the others. But I haven't used any kind of tester.
Once it is warm in runs smooth and no smoke. I don't know if I'm crazy, but the smoke seems less if the truck was parked on an a different angle, like with the nose down on an incline, or leaning on the drivers side.
I am going to try new wiring to the valve cover gaskets as a couple have broken clips and it doesn't seem like it would hurt anything.
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Postmaster
Joined: Sep 2007
Posts: 4,195
Likes: 6
From: Medford Oregon
Have you ohm'd out the glow plugs yet from the valve cover connections? Just one bad plug or connection will smoke out a small parking lot with a cold engine, ask me how I know?. I realize you indicated the GP's were replaced but I had to check and then recheck a third time as the GP on rear drivers side was not actually connected to the GP terminal. Hard to see in there and sure felt like it was .. lol. Third attempt the ohm meter indicated all was good, no more smoking out parking lots. It's amazing how much smoke will come out of one cold cylinder on a cold startup.
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Mountain Pass
Joined: Nov 2014
Posts: 132
Likes: 4
I checked the glow plugs at the valve cover connections, and they all were great. Gaskets and under cover connections are all new motorcraft too. I also put my voltmeter on the harness connectors and was getting 12V to all. But I'm kind of wondering about checking the resistance further back on the wiring closer to the GPR. When I was getting 12V that was with no load at all. The harness connectors definitely show their age.
I shot an IR thermometer at my exhaust manifolds and there were some cylinders definitely colder than others. I may not have been hitting them in a good spot though.
The smoke smells rich of diesel/diesel exhaust. It is blue white. I am not using any fluids at all.
What I mentioned was the amount of smoke on startup seemed like it lessened if I was parked facing down a hill vs up or leaning left vs right.
I shot an IR thermometer at my exhaust manifolds and there were some cylinders definitely colder than others. I may not have been hitting them in a good spot though.
The smoke smells rich of diesel/diesel exhaust. It is blue white. I am not using any fluids at all.
What I mentioned was the amount of smoke on startup seemed like it lessened if I was parked facing down a hill vs up or leaning left vs right.
Tuned
Joined: Nov 2016
Posts: 385
Likes: 116
From: Full time RVer
If you would like to know more, pm me?