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Unread 06-14-2010   #1 (permalink)
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Default 1991 Mustang White Smoke and Heavy Gas Smell

This is one of my first posts to the forrum so I'm hoping to strike some gold. My 91 5.0 has developed white smoke out the exhaust. I have a crossover so hard to tell from which bank, but fairly certain it's only the passengers side. From what I can tell the basic problems are not the cause, Mass Air Flow seems good, temp sensors and IAC within range, and there is no mixing of gas in the oil, and no coolant flowing in there either. White smoke is usally I know tied to burnin some coolant, but the level is rock steady....

That being said, I'm kind of at loss, Could it be a spot in cap, or junk wire or cracked plug causing some loading. I stray from this because give it fuel to rev it up and no miss or knock...

Maybe a bad fuel injector leaking down when it sits? They are orange injectors so I'm feeling they're prob the stock 19lb ones...
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Unread 06-14-2010   #2 (permalink)
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I'm not an expert but here is my 2 cents...
How many miles does this engine have?
I'm trying to suggest burning oil.. as some people do mistake the color of the smoke.
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Unread 06-14-2010   #3 (permalink)
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coolant burns white. oil burns blue/black. HeAD GASKET WOULD BE MY GUESS. Run a pressure test on the cooling system.
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Unread 06-14-2010   #4 (permalink)
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Yeah I thought maybe oil too.. But again.. Like the coolant level... No change in level. Actual milage on the motor I not sure of as it has 115k, but work was done before I got it. Runnin a pressure leak down test on coolant system no that hard to do, but it's not a continual problem. Intermitant, not steady smoke... Somedyas there, some not.
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Unread 06-14-2010   #5 (permalink)
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I also noted that you can smell gas heavily on the passenger side, and on an occassion when first start youll catch fuel drip from the headers. The burnin oil could be absolutely true, possibly from cylinder wash down when not running?
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Unread 06-14-2010   #6 (permalink)
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will oil burn black? My Escort burns a MASSIVE amount of oil and smokes black when I get on it. Could that be the oil? I always thought it just burned blue. No check engine light or running issues.
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Unread 06-15-2010   #7 (permalink)
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Clean oil is blue when mixed with gas. As far as OP pull the plugs they will tell you alot. You dont park facing downhill in the rain do you?
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Unread 06-15-2010   #8 (permalink)
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As far as the smoke goes it's def white and smells like unburned fuel... It's usually parked level in garage, but occassionaly will be outside...
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Unread 06-16-2010   #9 (permalink)
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It could be unburned fuel if its mixed with steam.
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Unread 06-17-2010   #10 (permalink)
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Pressure tested it an no leak downs. Also tuned it up so we'll see.. If it still happens I'll look to injectors
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