When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
[updated:LAST EDITED ON 15-Nov-02 AT 04:54 PM (EST)]well here's what my book says for code 34 considering you have an EEC4 computer:
EGR Valve Position (EVP) sensor or Pressure Feedback EGR (PFE) sensor: signal voltage out of Self-Test specification limits,
or,
signal voltage above closed limit during normal engine run operation,
or,
signal indicates insufficient EGR flow
hope that helps!
i also have an 89 F150 with the 5.8L. it didnt idle right before i rebuilt it and it still doesnt after. its not a smooth idle by any means, prob why both motor mounts were cracked through. i long for the days without computers controlling things for us!!! prob a bad design on Fords part