Question about 1990 Ford F250
Posted by Anonymous on
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
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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