1990 Ford F-250 Q&A
1990 Ford F-250 Question: The check engine light comes on from time to time
Many things can cause the check engine light to illuminate. For a 1990 7.5L V8, I would think emissions controls items. Have a diagnostic test performed - codes will be available from the engine's processor that indicate what system failure is causing the light to come on. Then testing can be done to find out what exactly caused the light. Good luck. - DaveJHM
The Check Engine is an indicative of a malfunction detected in the emission control system of your truck. It is absolutely necessary to retrieve the trouble code(s) stored in the computer to diagnose and fix the problem. For more info visit; https://repairpal.com/check-engine-light Use the Directory to find a technician near you; http://repairpal.com/ford-within-5-miles-of-94941 - fernando
I agreed with everything said. Take the vehicle in and get the code pulled. - Hal...