311 538 632 311 538 632 koer any ideas?
94 f150 160k

 

5.0 auto e4od

 

Well that is just one set of codes. Our trucks repeat themselves once.

311- Thermoactor air system inoperative
538- could be operator error meaning you touched the throttle during test otherwise it is invalid cylinder balance test due to CID circuit failure
632-Trans control switch circuit did not change states (operator error)

 

You need the KOEO's & Continuous Memory codes if there is any, before moving on to the KOER's. Otherwise KOER's codes are not trustworthy.

See Link: https://www.f150forum.com/f10/heads-...05/#post623219

 

Not on that year. His engine is EFI. EFI's are MAP sensored.

C/B test can only be preformed on SEFI (Sequential Electronic Fuel Injection). Which was only available in the last year's of the OBD1 generation engines. Usually accompanied w/ MAF sensor, rather than MAP.


MAF sensors detect real time air flow, where MAF sensor's can only monitor Manifold pressure...but all that's another story.