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Old 05-24-2009, 08:14   #1 (permalink)
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94 Ford F-150 5.8L error codes... how to fix??

I have a 1994 Ford F-150 5.8 liter and about 2 months ago I changed the spark plugs, sp wires, and the distributor cap cause it wasn't firing all cylinders. After that it ran fine better than ever. But the check engine light started coming on. Its not on when i start the motor but after a min or so of driving it will come on. I just found my code reader we have and i tested my engine and got all these

311
Thermactor Air System
problem – no operation
during Engine Run Self-
Test (Bank #1).

332
Insufficient EGR flow
detected.

538
Insufficient RPM change
during Dynamic Response
Test (Engine Run Self-
Test).
or,
Invalid cylinder balance test
– throttle position
movement.
or,
Invalid cylinder balance test
– cylinder identification
problems.

536
Brake On-Off (BOO) switch
– circuit failure or not
activated during Engine
Run Self-Test.

632
Overdrive Cancel Switch
(OCS) – no switch action
detected during Engine
Run Self-Test.

How can i fix all these????
Please help
thank you
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Old 05-30-2009, 11:13   #2 (permalink)
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Location: Memphis, TN, USA 38135
Posts: 303
Re: 94 Ford F-150 5.8L error codes... how to fix??

The last 3 mean you failed to perform the test correctly. Read the 7th post in this thread:
Ford F150 won't turn over
Note that the engine must be at operating temperature before testing.

The top 2 suggest a vacuum leak, which is VERY common. Use the vacuum map on the emissions sticker under your hood to trace each line checking for breaks/degradation. They're known to become very brittle, so either slip a rubber splice over the break, or just replace each one with rubber vacuum hose & plastic Ts. They're color-coded, so it's not as hard as it sounds or looks, if you do them 1-@-a-time. If you have the coffee can reservoir on the R wheelwell, it's also known to rust/crack, so upgrade it to the later plastic version from a junkyard.
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