I have a 1996 f 150 with a 4.9L The check engine light is on. "system to lean bank one and bank two"
I have already cleaned the injectors, changed the plugs and ran cleaner through the gas tank. I changed over from conventional oil to mobil one.
Any ideas???
plugged fuel filter or low pressure from fuel pump, mebbe ?
is there a test fitting on the fuel rail ?
check the gasket between the upper and lower intake manifolds for a leak. That gasket has a slight higher than average failure rate when older. Spay bottle with course mist of water (safer) or carb spay will dramatically change the idle when sucked in a leak. if not leaking check for any other leaks. Watch the carb spray around the distributor exspecially
On Tue, 07 Jun 2005 00:57:28 +0000, paul rearranged some electrons to form:
Vacuum leak, maybe?
Sounds like you need a new fuel pump. I just went through the same problem. Cause was the fuel pump and one of the 02's
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