Help me
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Joined: Apr 2011
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Help me
I have a 1995 ram with a 5.9. i can start my truck but it blows out blue smoke and it smells like straight fuel. I do not have a check engine light. I put my truck into gear and it wants to die. Any ideas on what the problem is? Someone please help me?
Captain
Joined: Nov 2010
Posts: 632
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From: SE Tx
Blue smoke is oil burning. Burning oil fouls the front o2 sensor (which regulates the a/f ratio) which may be why you have the "straight fuel" smell.
Check the plenum: https://dodgeforum.com/forum/2nd-gen...um-thread.html
Next on the list is pcv valve, though I've never heard of one failing that bad.
If that checks out, possibly your valve seals or piston rings... which aren't easy.
Check the plenum: https://dodgeforum.com/forum/2nd-gen...um-thread.html
Next on the list is pcv valve, though I've never heard of one failing that bad.
If that checks out, possibly your valve seals or piston rings... which aren't easy.
Captain
Joined: Nov 2010
Posts: 632
Likes: 4
From: SE Tx
No, white smoke is usually coolant (water) or very high levels of oil. Blue smoke is generally accepted to be a moderate amount of oil.
If blue smoke was gas, you'd see it every time you drastically changed throttle position (floored it). Which doesnt happen.
If blue smoke was gas, you'd see it every time you drastically changed throttle position (floored it). Which doesnt happen.
Record Breaker
Joined: May 2010
Posts: 1,322
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anyways....... i too have always come to think that blue smoke was a fuel problem... which means ur dumpin to much fuel in that its cant get it all burned off so it just gets pushed out. and the reason it dont do that when you floor the gas, is cuz the engine ge tthe higher air/fuel ratio also so it is able to burn that extra fuel, otherwise it wont and would give you blue smoke.
as to what is causing your prob. i hostestly have no clue off the top of my head, did you recently do anything to it? sounds like the fuel is not being regulated to me. the injectors are just pouring like a mother.
as to what is causing your prob. i hostestly have no clue off the top of my head, did you recently do anything to it? sounds like the fuel is not being regulated to me. the injectors are just pouring like a mother.
Administrator
Joined: Apr 2010
Posts: 87,388
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From: Clayton MI
Black smoke is fuel.
White smoke is coolant/moisture. (some when you first start it is normal, also when it is cold out, as it is a product of combustion/cat converter)
Blue smoke is oil.
Disconnect the vacuum line from the pcv valve, and plug it. Start the engine. Let it run for a few minutes, still getting blue smoke? Take off the oil cap. Is the breeze blowing out? Or is it sucking in? A bit of pressure is normal. A lot of pressure is bad news. Sucking in more than likely means you plenum is blown. Blown plenum will lead to excessive oil consumption....... and blue smoke.
White smoke is coolant/moisture. (some when you first start it is normal, also when it is cold out, as it is a product of combustion/cat converter)
Blue smoke is oil.
Disconnect the vacuum line from the pcv valve, and plug it. Start the engine. Let it run for a few minutes, still getting blue smoke? Take off the oil cap. Is the breeze blowing out? Or is it sucking in? A bit of pressure is normal. A lot of pressure is bad news. Sucking in more than likely means you plenum is blown. Blown plenum will lead to excessive oil consumption....... and blue smoke.
