67. 52. 84.. does anyone know what they they mean? it is an 88 f150 300 i 6 efi

 

ok. i found out that the 67. has something to do with the a/c and the 52. with the power steering and the 84. with the egr circuit. the engine light comes on and goes off when it feels like it. but when it goes off my truck runs like a new one. and it wont idle when u first start it up until it gets warm. any one have any ideas?? please help!

 

Those definitions depend on other circumstances - was this test with engine off, or with engine running? Were these active codes, or were they memory codes?

 

the engine was off

 

Was that the order that they came in? Were there separators in between?

Best I can figure is the 67 is an active code, then there should have been a separator, then the the other two were memory codes. (if they were in that order)

67 is either your MLP sensor if you have an auto trans, or the neutral safety switch if you have a stick. Need to know which trans you have in order to explain how to test/adjust/replace it.

52 is the power steering pressure switch (by my book at least)

84 points to a failure in the EGR vacuum solenoid. Could be a vacuum line, solenoid failure, or a short in the wiring.

If you have idle issues at start up, the likely suspect is the IAC solenoid. You might try cleaning with throttle body cleaner, but replacement is probably in your future. Might also check the throttle body itself to make sure the butterflies are clean and not sticking.