Question about 1991 Ford F150

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I HAVE A 1991 FORD F150 WHITE SMOKE FROM TAILPIPE AND ENGINE RATT

WHEN I PUSH ON THE GAS WHITE SMOKE COMES OUT AND THE ENGINE MAKES A RATTLE SOUND LIKE A BAD VALVE I LET GO OF THE ACCELERATOR AND IT STOPS SMOKING, STARTS UP FINE AND IS NOT MISSING TOO BAD. WHAT CAN IT BE?

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  • Jeremy Lamb May 11, 2010

    any loss of coolant

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  • Ford Master
  • 783 Answers

Sounds as if you are running extremely lean.Has EGR been bypassed maybe?
What is fuel pressure,on that vehicle the fuel pressure regulator may be adjustable.Some of these had an allen screw inside the vacuum port where you could richen the mixture some.Also try backing down on the timing a few degrees.

Posted on Mar 03, 2009

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