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Old 07-29-2014, 10:58 PM   #1
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Default Code P0300 and lots of white smoke

I am new on here and looking for some help!

I have a 1996 Supercharged 3.8 in my Fiero. It was running perfect and one day I started it, pulled up to the stop sign and went to take off and boom it randomly started misfiring and almost dying. Its reading a code p0300(random cylinder misfire) and blowing a crap ton off white smoke that smells like fuel. I put my hand in front of the exhaust and i get soaked with fuel. The oil level is fine and no milky stuff on the bottom of the oil cap. Just wondering if anyone has experienced anything like this. It has me stumped right now before we start taking things apart and checking sensors. Kinda wondering if its the ignition control module. Thanks for any help!

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Old 07-29-2014, 11:21 PM   #2
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Check to see if the fuel pressure regulator is blown out, if not you have a stuck injector if it raw fuel coming from the exhaust.
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Old 07-30-2014, 02:20 AM   #3
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Here is a good video to help you properly test the FPR, skip to 1:50 seconds for the relative info.
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Old 07-30-2014, 06:52 AM   #4
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if not that sounds more like coolant, check the plugs. if there is coolant not fuel, likely needs lim and sc base gaskets
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Old 07-30-2014, 10:25 AM   #5
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Thanks for the video. Will check that tonight! I don't believe it to be any of the gaskets, because within the last 10,000 miles I have tore the whole engine down and replaced them all. It'* possible but it'* dumping fuel like crazy.
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Old 07-30-2014, 03:12 PM   #6
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Fuel pressure test?
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Old 07-30-2014, 03:21 PM   #7
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Forgot to add, that I don't think raw fuel into the exhaust would cause "white" smoke, more likely coolant......
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Old 07-30-2014, 09:04 PM   #8
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I agree, white smoke is usually an indication of the engine eating coolant. If it was fuel, you'd be seeing flames down the street.

Check the coolant level in the radiator.
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Old 07-30-2014, 11:46 PM   #9
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Update tonight, scanner saying misfire on number five now. Plenty of spark there, saw it and felt it when I took the wire off! Ha Unplugged the injector and smoke started to clear up a little. Thinking the injector is stuck. I know it'* fuel coming out of exhaust, i have very short exhaust and it is very strong odor of fuel! I should clarify smoke has a bluish/white color. I know what a coolant leak looks and smells like. Coolant level hasn't changed and no overheating issues.
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Old 07-31-2014, 05:41 AM   #10
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If it is really a stuck open injector, that'* a first time for me seeing one on a 3800.
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