Fuel coming out of Exhaust?


MatthewGraham

10+ Year Member

Joined
Mar 29, 2012
Messages
16
Points
1,601
Vehicle Year
1994
Transmission
Manual
When the mass air flow sensor is plugged in, I can see the tailpipe exhaling a lot of smoke, and fuel is splashing and dripping out of it. The RPM at idle is 900, and is rough.
When I unplug the MAF sensor, everything runs fine. What could be the issue?
My Ranger is a 1994 4.0l V6 2WD
 
Last edited:
Well the MAF is a likely candidate.

Are you sure it is actual raw liquid fuel dripping though? It is very odd for the cats to not catch liquid fuel and absorb it (which will melt them darn quick by the way).
 
I replaced the MAF sensor a few days ago. My guess is that it has the be something that that specific sensor controls or is linked to, because when it's unplugged it uses default settings in the computer and the problems dissapears. What runs between the computer and the MAF sensor?
And no, I'm not 100% sure. I just know that it's clear and stinks.
 
Last edited:
Oh, and when the sensor is plugged in, my MPG plummits. That's why I think that the liquid coming out of the exhaust pipe is fuel.
 
The MAF just reports inferred air flow back to the computer. When you replaced the sensor did you reset the memory?
 
How do you reset the memory? (I'm VERY inexperienced with engines and the like)
 
Unhook the battery, take a test light, or an old headlight with some wires on it, and run it across the battery cables with at least one side unhook. That should do it.
 
I don't have a testlight or an old headlight. Is there any other way I can reset it?
 
You CAN tap the battery cables together, but its better to put some load across so you don't risk damaging the PCM.

Any load will work, a fan, a light bulb, anything that runs on electricity and has some wires. It's just to discharge the capacitors in the system.
 
I just unhooked the positive and negative sides, and left it sit for awhile. I started it back up and let it idle for awhile, and it seemed to go back to normal for a little bit, but started sputting again. I drove it around for awhile and it seemed fine. when I arrived back at the house, no smoke or fluid was coming from exhaust, but the sputtering still occured. I then opened the hood to find that the radiator was overheating, my step dad went out to the truck while I was letting the radiator cool and the cap blew off when he put his hand over it and spewed boiling water all over his neck and chest, so he's on his way to the ER.
 
Ouch. Maybe you should let a pro look at it.
 
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