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02:34:52 - 05/20/2024
General Dakota Board
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loud4.7
Dodge Dakota
9/17/2001
10:15:41
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 Subject: SMOKE !
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Message:
Hi..
I need some help on a problem with my 2000 4.7 that is really bothering me.. Once in a while, when i start the truck up after it has been already started once ( like if i have to move it out of the garage, then start it up again to leave) it will smoke !! I could nto believe it.. it is like a blueish smoke . the truck has 18,000 miles on it.. could I be gettin blow by oil ?? i sue valvoline 10W-30 in the summer and 5W-30 in the winter. any ideas?? I hate taking the truck to the dealer.. but if this is major , maybe i should take it asap? please help !...... thank you......
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RJKobbeman
GenIII
 
9/17/2001
10:40:37
| RE: SMOKE !
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Message:
I would have to get more info to be sure... but my first guess is that it is simply a real rich mixture caused by starting it cold... but not letting it warm up.
Sounds wierd to happen on new vehicles, but I have experienced this in many new cars/trucks. If you start you vehicle when it is cold (not necessarily cold weather... engine just not warmed up), and shut it off relatively soon (moving it in/out of the garage is the perfect scenario), the system never had a chance to come out of the 'cold start' circuit. This can leave extra unspent fuel in the engine. The next time you start it, it may actually run a little rough for a minute or two until the system corrects the mixtures to match the state of the engine.
My 97 Thunderbird did it. My wife's 99 Saturn did it. My 00 Dakota does it. Just picked up a 01 Expedition... and I'm sure it will do it.
Just let your vehicle warm up for a couple of minutes when starting it. Once the engine idle comes down to normal, that should be good enough.
Don't know HOW MUCH smoke is coming out... but I assume it is a little extra fuel (rich mixture).
Rob
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Anthony G
Dodge Dakota
9/17/2001
12:07:34
| RE: SMOKE !
IP: Logged
Message:
Blue Smoke- Pale, bluish-white smoke is the result of engine lubricating oil being burned in the engine's combustion chamber. The most common causes of blue smoke in the exhaust are worn piston rings or loose valve guides. Both conditions involve major engine repairs to correct. Your can often diagnose the source of this blue smoke by performing an engine wet/dry compression test.
Black Smoke-Black smoke is the result of partially-burned gasoline being carried down the exhaust. This unburned fuel is wasteful, expensive, and a carcinogen. Black smoke can usually be eliminated with fuel injector repairs.
White Smoke-Very dense, white smoke present in vehicle exhaust gases is symptomatic of transmission fluid being sucked into the engine's combustion chamber and burned. This white smoke is not normal and, if present in the exhaust, generally indicates a problem with the transmission modulator valve. This problem can typically be corrected by replacing the modulator valve.
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