Raw fuel and gray smoke coming out the exhaust


Asked by Jan 24, 2014 at 10:58 AM about the 1994 Dodge Ram 1500 2 Dr Laramie SLT 4WD Standard Cab LB

Question type: Maintenance & Repair

Hello everyone.. I'm a newbe here and hope some of you experts on this site could help me out with this problem I have with my 1994 Dodge RAM 1500 5.9 liter 4x4. I have raw fuel coming out of the passenger side exhaust. This truck has duel exhaust so we track it down to # 8,6,4,2 cylinders. This truck has been ran with the # 4 injector wire off for sometime and just now found it off. Truck was running ruff at low idle so installed new plugs and wires and was going to clean injectors and found the wire off. Repaired the wire and plug it back in to the #4 injector and now I'm getting lots of grey smoke and raw fuel out the exhaust. Removed injector for inspection and it is not stuck open and works fine. Pulled the plugs on #4 and is was soaked. Checked the fire on that cylinder and it is good. Truck runs good at high rpms going down the road but I did noticed it is running a little hotter than normal. This one got me stumped.. Thanks in advance.

3 Answers


I forgot to add..the oil level shows a half quart low and hasn't change since we been working on it so there is not much fuel getting in the crankcase. Also # 4 cylinder is getting good compression. We are getting 2.4 to 3 volts to #8 6 4 but # 2 we are getting 14 volts when truck is running. Leaning more to computer problem. If anyone has A better idea than me, please let me know.. Thanks

1 out of 1 people think this is helpful.

If plug was soaked that tends to make me think that for some reason it was not firing or was getting to much fuel. I might would try a another plug and see what happens. Then try swapping the #4 injector with another one and see if the problem follows the injector or stays at the #4 cylinder. If it follows the injector replace the injector. If stays at #4 cylinder double check plug, plug wire and injector pulse.


Thanks for the help dandy... Yes we tried all of what you suggested earlier before I posted the problem and still had lots of grey smoke and raw fuel. The problem didn't follow the injector. We replaced the brain box and check voltage to the #2 cylinder and we are getting 3,8 with the truck running. Plug the injector connection back on the fuel rail and fired up the truck and no gray smoke or raw fuel. Check engine light even went away.. Thought we might have to flash the used brain box we installed but so far no strange codes have showed up.

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