No power
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Junior Member
Joined: Nov 2019
Posts: 3
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No power
I replaced numerous sensors, total tune up, new fuel pump, so my 93 f150 starts with help from gas in the intake but has no power and shakes. I floor the gas pedal in drive and it does not go above let's say2200 rpms and has no power to spin tires on dirt/gravel.. and when I shut it off it wont start without help with gas in the intake..I had no power low power in cylinder no4 so I replaced the injector nothing changed..all plugs where new about a month ago and so I pulled plug no4 and it has carbon and oil build up and the diode was burnt down.. I cant get it to a shop to put the code reader on it.. it runs but it isnt road worthy.. any thoughts would be greatly appreciated
Last edited by Yukonshawn; Dec 10, 2019 at 06:56 AM.
5 Year Member
Joined: Nov 2012
Posts: 724
Likes: 185
From: California
If the check engine light is on, you need to pull codes at that key cycle. Unlike OBD2 systems, OBD1 systems dont have any Keep Alive Memory, so if the check engine light comes on, when the key is shut off, that code is cleared from memory until the fault happens again.
Member
Joined: Jan 2018
Posts: 11,256
Likes: 1,770
From: Memphis, TN, Earth, Milky Way
IDK about OBD-1 because Ford never used that protocol. But all Ford EEC-IV vehicles (including all '88-95 F-series/Broncos) have KAM & KAPWR. That's where adaptions are stored, in addition to DTCs (which last 40 or 80 warm-up cycles before being dumped). It's all explained in this caption:
(phone app link)
A code reader is NOT necessary, or recommended (because they're VERY UNreliable on EEC-IV). But it's not likely that codes will help with such a vague symptom anyway.
"Numerous sensors" is vague. If you want help, we need specifics. Brand, PN, source, and the specific diagnostic step that the original part failed. Did each replacement pass the same test that its original part failed? EEC-IVs tune themselves up about 200x per second, so they don't need tune-ups. Only maintenance & repairs. Have you followed the maintenance schedule using only top-quality parts, and recommended techniques? There is no diode for a spark plug - do you mean "electrode"? Post pics of what you're seeing, and put all the truck's details into your signature as this caption explains:
(phone app link)
A code reader is NOT necessary, or recommended (because they're VERY UNreliable on EEC-IV). But it's not likely that codes will help with such a vague symptom anyway.
"Numerous sensors" is vague. If you want help, we need specifics. Brand, PN, source, and the specific diagnostic step that the original part failed. Did each replacement pass the same test that its original part failed? EEC-IVs tune themselves up about 200x per second, so they don't need tune-ups. Only maintenance & repairs. Have you followed the maintenance schedule using only top-quality parts, and recommended techniques? There is no diode for a spark plug - do you mean "electrode"? Post pics of what you're seeing, and put all the truck's details into your signature as this caption explains:
