engine smoking white smoke
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Joined: Oct 2017
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From: Oklahoma City
I received the adapter for the compression tester hose. I checked compression on all 8 cylinders. It was 320 or 340 psi on all 8 cylinders. This would tell me the head gasket and rings are OK. Maybe not new but wearing evenly. I then replaced all 8 injectors with another set I had from a donor truck. I still did not see any kind of change in the behavior. I know that does not necessarily rule out the injectors but I would have expected to see at least a change in the behavior if it was a bad injector. I am now going to replace the turbo with the one off the donor truck and see if it stops the smoke. After reading the post about the turbo leaking into the exhaust I suppose that could be the problem since I am about out of ideas. Won't hurt to try since I do have a donor turbo also.
Anyone got any other ideas? Would low turbo boost cause this issue? It doesn't seem to have much boost pressure although I haven't taken it out on the road because of all the smoking.
Anyone got any other ideas? Would low turbo boost cause this issue? It doesn't seem to have much boost pressure although I haven't taken it out on the road because of all the smoking.
Got Data?
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From: Lake Stevens, WA
Were you able to measure your fuel pressure under load? I saw you checked it at 2K RPM, but not sure if that was under load. A couple of WOT runs would be good to know.
What does the smoke smell like? If oil, your plan to check the turbo outlet for oil is a good one. If fuel or coolant, that's pointing a different direction I think.
What does the smoke smell like? If oil, your plan to check the turbo outlet for oil is a good one. If fuel or coolant, that's pointing a different direction I think.
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From: Henderson, NV
320 to 340 psi is pretty borderline for a cranking compression test. You may just be on the verge of not getting not enough compression for ignition.
Try doing a running compression test:
Try doing a running compression test:
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Junior User
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From: Oklahoma City
Were you able to measure your fuel pressure under load? I saw you checked it at 2K RPM, but not sure if that was under load. A couple of WOT runs would be good to know.
What does the smoke smell like? If oil, your plan to check the turbo outlet for oil is a good one. If fuel or coolant, that's pointing a different direction I think.
What does the smoke smell like? If oil, your plan to check the turbo outlet for oil is a good one. If fuel or coolant, that's pointing a different direction I think.
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Junior User
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From: Oklahoma City
I went out and ran a compression test with the engine running. The compression drops to around 200psi on each cylinder while the engine is running. Is this normal? I wouldn't think so. What would cause that?
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From: Henderson, NV
Originally Posted by chasteen1156
I went out and ran a compression test with the engine running. The compression drops to around 200psi on each cylinder while the engine is running. Is this normal? I wouldn't think so. What would cause that?
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Junior User
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From: Oklahoma City
Running compression should be quite a bit higher. That means your engine is not sucking air in as efficiently as it should. How clean is your air filter? Repeat the running compression test with the air filter removed and see if pressures improve. Do this in as clean an environment as you can manage. You don't want to inadvertently dust your engine.
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From: Henderson, NV
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From: Oklahoma City
I wanted to follow up on this thread. I removed the intake tubes all the way down to the plenums. There was no restrictions. I was doing a google search on what would cause the compression to decrease while running and came across someone who suggested checking the exhaust side. I then disconnected the exhaust and started the truck up and there was no more smoke. It turns out the catalytic converter was clogged up and causing so much back pressure the engine could not get enough air to burn all the fuel. What an adventure. I had never thought that could be an issue but it makes sense when I think about it. I am just glad to have found the issue. The truck was not making boost because of the restriction in the exhaust.
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From: Lake Stevens, WA
That is unexpected - thanks for the followup. It's too bad a code was not set for EBP to help guide us. But a live scan with Torque Pro or Forscan might have given us a clue. I've been wondering how to check for back pressure on my gassers with cats, without pulling a pipe off.
Could you take a look at exhaust back pressure with the clogged cat and see what it reads?
Also, does anybody reading this have data from trucks with exhaust restrictions due to a catalytic converter?
Edit: do you need a converter in Oklahoma?
Could you take a look at exhaust back pressure with the clogged cat and see what it reads?
Also, does anybody reading this have data from trucks with exhaust restrictions due to a catalytic converter?
Edit: do you need a converter in Oklahoma?
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Junior User
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From: Oklahoma City
That is unexpected - thanks for the followup. It's too bad a code was not set for EBP to help guide us. But a live scan with Torque Pro or Forscan might have given us a clue. I've been wondering how to check for back pressure on my gassers with cats, without pulling a pipe off.
Could you take a look at exhaust back pressure with the clogged cat and see what it reads?
Also, does anybody reading this have data from trucks with exhaust restrictions due to a catalytic converter?
Edit: do you need a converter in Oklahoma?
Could you take a look at exhaust back pressure with the clogged cat and see what it reads?
Also, does anybody reading this have data from trucks with exhaust restrictions due to a catalytic converter?
Edit: do you need a converter in Oklahoma?
I am not sure if we need a converter here in Oklahoma but I had another truck for parts anyway. I did not buy a new one.
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From: Muskogee, Ok
And no, we do not need a cat in Oklahoma. No more yearly inspections here for about 20 years now, even then it was just wipers, lights, horn. Ya know, the basic stuff they should only be checking anyways
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