White smoke and gasoline coming out of exhaust? | Ford Explorer Forums - Serious Explorations

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White smoke and gasoline coming out of exhaust?


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November 16, 2010
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Year, Model & Trim Level
'93 Explorer
I have a '93 4.0 Explorer with 219k miles. I started it about an hour after using it last and it wouldn't start or run right. She was blowing white smoke and gasoline out of the exhaust pipe. I drove it home from where I was which was about an hour trip and the white smoke eventually went away, but the rough running didn't. I replaced plugs and then wires and once I replaced the wires she ran a lot better. So I shut her off to check my oil, topped that off, went to start her again and she would barely start again. White smoke and gasoline out the tail pipe and all.

Anybody know what the next step is? Mass air flow? Fuel filter? All cylinders are getting some sort of spark, but could it be that the coil pack isn't giving them ENOUGH spark?

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Is the smoke / vapor there all the time, or just until the engine has warmed up to operating temperature?

If it's only there for a little bit, it's probably just water vapor from the combustion process - it appears easier in colder weather. Some water (not gasoline) out of the tailpipe is normal.

If it's there all the time, then that is usually caused by a coolant leak via a blown head gasket or a crack in one of the heads or the block.

Pull a couple of the spark plugs and compare them to the chart and also make sure that the gap is around 0.054" (acceptable range is "0.052-0.056").

Lastly, is the Check Engine light or or has it been on recently?

Possible your FPR just went out and is now letting to much fuel get in threw the vacuum line from it into the intake. Just a thought.

x2 on FPR / fuel pressure regulator valve

Appreciate it guys. But it feels like a cylinder isn't firing, is that because the fuel//air mixture isn't righ tbecause of the FPR?

Also, the white smoke will go away, but I'm almost positive it isn't just water vapor, just because of the way it puffs out, as if it were coming from one cylinder. And it is definitely gasoline coming fro my exhaust.

Seriously appreciate the input guys.

If the smoke / vapor goes away, then it's probably not a continuous leak, but if you have raw fuel dumping out the exhaust, you need to check the fuel pressure. It should be in the low - mid 30's PSI with the engine running.

After you check your fuel pressure, check your plugs. If only one cylinder is having problems then the plug will look different than the rest of them. Reading your plugs can help isolate which cylinder(s) is/are having the problem.