Faulty ECU?


fast240z

15+ Year Member

Joined
Dec 13, 2007
Messages
21
Points
3,101
Age
40
Transmission
Automatic
I have a 1994 Ranger XL with the 2.3L motor, and I've been having some issues with my truck, and I believe it may be an issue with the ECU. Lately, the truck has been running worse and worse. I am having issues with rough idle, lack of power, surging while running, and the check engine light comes on while driving but will turn off if the truck is restarted. While the truck is running rough, I can hear solenoids and switches clicking under the hood. Sometimes the truck will not start, but the starter will turn the motor over. If I pull the main ECU fuse from the fuse panel under the hood, wait a few seconds, then replace the fuse, the truck will start right up.

These issues lead me to believe that the ECU may be taking a dive. I have attempted to check the codes both with a KOEO and KOER tests, and was unable to pull any codes other than 111. I used a $300 OBDI tester from Kragen, which works on other OBDI cars.

Is there any way to pull CEL codes when the light is on and driving down the road?

Please help!
 
Last edited:
check your battery, have it tested! Make sure terminals are clean! Sounds like maybe your battery is giving out! Im not sure about the codes going down the road, especially seeing that your 94 is obd1?! The battery is where i would start first.
 
Seth, thanks for the suggestion. The battery is fairly new, but I had it checked anyways and all is good.

Still unsure of where to go with this one.
 

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