Mechanics

FORD F-150 SPARK PROBLEM

1997 Ford F-150 • 25,000 miles

Eng running rough pulled out spark plugs & oxygen sencer because eng light never comes on. Both are cherry red, looks like lean cond, but asking what else could cause this problem also checked for vacume leaks but found none?
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Wayne young
February 23, 2013.




Start with basics, compression, fuel pressure and spark.

You need to check the long term trims to see if it is running lean

Roy

ASEMaster6371
Feb 23, 2013.


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