Blue smoke while engine is cold, no smoke going down the road.
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Diesel Fan
Joined: Sep 2009
Posts: 59
Likes: 1
Blue smoke while engine is cold, no smoke going down the road.
I have a Ford with a 96 Cummins, and 260,000 miles. The truck has blue smoke when it is cold under acceleration. It does not smoke blue when the engine is fully up to operating temperatures, when it is idling, or under very light throttle pressure.
I know there is an internal fuel leak, as the oil dip stick does not go down (may go up a hair, and I do mean a hair), but there is fuel dilution that necessitates changing the oil at 4,000 miles.
I just rebuilt the turbo( needed it anyway), but it did not solve the problem.
Where could the oil be coming from with these symptoms, where there is no blue smoke at idle, and when the engine is fully warmed up? Is it related to the pump leak?
Would one of those top end rebuild kits that Diesel Care sells take care of the problem with the fuel leak? Link to rebuild kit Rebuild kit P7100 Dodge Cummins 6B 5.9 5.9L diesel pump:eBay Motors (item 330350928692 end time Nov-06-09 17:00:10 PST)
Thank you in advance
I know there is an internal fuel leak, as the oil dip stick does not go down (may go up a hair, and I do mean a hair), but there is fuel dilution that necessitates changing the oil at 4,000 miles.
I just rebuilt the turbo( needed it anyway), but it did not solve the problem.
Where could the oil be coming from with these symptoms, where there is no blue smoke at idle, and when the engine is fully warmed up? Is it related to the pump leak?
Would one of those top end rebuild kits that Diesel Care sells take care of the problem with the fuel leak? Link to rebuild kit Rebuild kit P7100 Dodge Cummins 6B 5.9 5.9L diesel pump:eBay Motors (item 330350928692 end time Nov-06-09 17:00:10 PST)
Thank you in advance
Thread Starter
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Diesel Fan
Joined: Sep 2009
Posts: 59
Likes: 1
I replaced the injectors soon after installing the engine. They are stage 1 Pensacola injectors. What made you think the injectors are the culprit? Were you thinking wash down?
I thought Blue smoke meant oil burning oil, white or gray meant burning lean, white meant water, and black meant burning rich. Am I right?
If it is the injection pump, could someone explain how oil gets into the fuel? I would think the pressure in the DV would be too high to allow oil into the chamber.
I seem to have more questions then answers.
I thought Blue smoke meant oil burning oil, white or gray meant burning lean, white meant water, and black meant burning rich. Am I right?
If it is the injection pump, could someone explain how oil gets into the fuel? I would think the pressure in the DV would be too high to allow oil into the chamber.
I seem to have more questions then answers.
BOMBARDIER
Joined: Mar 2007
Posts: 23,293
Likes: 1,322
From: North of You
a number of people have had problems with Pensacola Diesel injectors. I would try getting them tested or better yet, getting some stock injectors and running them for 4-5k to see if that makes a difference.
Thread Starter
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Diesel Fan
Joined: Sep 2009
Posts: 59
Likes: 1
Dad bought a temp gun, and checked the temperature at the head of each cylinder and cylinder manifold port. Here is what he found.
cylinder Temp manifold
1 ----------173------150
2-----------190------150
3-----------204------185
4-----------202------204
5-----------202------205
6-----------202------204
I read somewhere that if there is greater then a 10% variance in temperature, the injector at that port is not acting properly and should be replaced.
Any thoughts?
cylinder Temp manifold
1 ----------173------150
2-----------190------150
3-----------204------185
4-----------202------204
5-----------202------205
6-----------202------204
I read somewhere that if there is greater then a 10% variance in temperature, the injector at that port is not acting properly and should be replaced.
Any thoughts?
Last edited by BioHMMWV; Oct 23, 2009 at 01:28 PM.
