96 f150 check engine light

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paul - 07 Jun 2005 01:57 GMT

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???

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TranSurgeon - 07 Jun 2005 02:14 GMT

plugged fuel filter or low pressure from fuel pump, mebbe ?

is there a test fitting on the fuel rail ?

> I have a 1996 f 150 with a 4.9L The check engine light is on. "system to
> lean bank one and bank two"
[quoted text clipped - 3 lines]
>
> Any ideas???

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coryrhonda - 07 Jun 2005 02:51 GMT

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

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David M - 07 Jun 2005 04:10 GMT

> I have a 1996 f 150 with a 4.9L The check engine light is on. "system to
> lean bank one and bank two"
[quoted text clipped - 3 lines]
>
> Any ideas???

Vacuum leak, maybe?

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BCM - 07 Jun 2005 04:27 GMT

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

> I have a 1996 f 150 with a 4.9L The check engine light is on. "system
> to lean bank one and bank two"
[quoted text clipped - 3 lines]
>
> Any ideas???

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