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Old January 3rd, 2015, 11:00 PM
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Default Need Help With Trouble Codes

92 f150 302

CEL comes on after about 10 minutes or so and goes away if the engine is restarted.

key on engine off codes:
31 =
EVP – EVP signal is/was out of range – EVP
EVR – EVP signal is/was low – EVR
PFE – PFE signal is/was low – PFE

33 = ALL – EGR did not open/ respond during test or if memory code, did not open intermittently – EVP EVR PFE

Engine running Codes
12 =* Idle Speed Control motor or Air Bypass not controlling idle properly (generally idle too low) – ISC

25 = Knock sensor not tested (ignore if not pinging) – KS

What I know:

EGR pipe is broken between the valve and the intake. I put a high temp hose patch, but I still get the code so I think the valve is bad. Ill be replacing it soon.

IAC valve has had issues for a while. Currently unplugged to keep idle down. Its crazy high when plugged in. I think it may be an intake gasket leak, but dont know how to test that theory. I plan on replacing the intake gaskets when i pull the intake to replave the EGR tube and valve anyway. So if im right that should fix that issue.

And for 25, i hear no pinging, but i haven't got a very trained ear for that sort of thing. How can I be sure ?

All help appreciated.
Old January 5th, 2015, 04:11 PM
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This fourm is a let down.

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