Question about 1990 Ford F250

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1992 f150 4.9 liter runs rough and smokes black

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Black smoke is due to a rich fuel mixture, Check first to make sure you have a clean air filter. If you have a MAF Sensor or an O2 sensor going or gone it will tell the computer the wrong information and the computer will adjust accordingly. You can always use a code reader to see what codes you have, A parts store will have one to read a code for you. I have seen more black smoke from a restricted air filter than anything.

Posted on Nov 06, 2014

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Posted on Jan 02, 2017

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SOURCE: f150 5.4 liter v8 running

White smoke while running usually indicates water in the combustion chamber (bad head gasket or cracked head) but white smoke on startup only is usually a sign of unburnt fuel (rich mixture). Either bad injectors, injector seals? Maybe something else That's assuming it's fuel injected

Posted on Aug 12, 2008

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SOURCE: I HAVE AN 03 F-250, 6 LITER DIESEL. IT DOES NOT START

sorry to say ur high pressure oil pump is going bad!

Posted on May 14, 2010

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The Symptoms tell me it is a head gasket. A leaky or bad head gasket would cause all of the problems that you mentioned.

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This seems almost text book to me... I would have someone local to you to have a look at it to be sure.

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