I have a 1987 FX-16 GTS and the check engine light is always on. When I check the codes it says there are no errors. How can I get the light to reset? I have tried disconnecting the battery for a day to let the power drain but that had no effect. Thanks!
BTW, I bought the car new. It now has over 176K miles on it and I still smile every time I get behind the wheel. What a great car!
check engine light won't reset - no bad codes
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Re: check engine light won't reset - no bad codes
I've had an issue like this before where my CEL stayed on constantly and there was no DTC present. It turned out to be a electrical problem in the interior harness leading to the ECU, you might not be having the same electrical problem or an electrical problem at all but for my issue it turned out that a few wire pins (I can't recall which wires) were loose at the pigtail connector and I only found that out by wiggling the harness behind the connector and the CEL kept going on and off. Check your "grounds" and it might be worth a shot trying to wiggle a few wires. Good luck.
Re: check engine light won't reset - no bad codes
I have a new clue. I took the car on a road trip and whenever I got above 4000 RPM in 5th gear (and sometimes in lower gears) the CEL would go out. It ALWAYS came back on as soon as the engine dropped below 4000 RPM. That gave me a good indicator whenever I dropped below 80MPH.
Re: check engine light won't reset - no bad codes
Given that info, I'd suspect a bad AFM or throttle position sensor. Kinda weird it wont through a code though. Hm, but its inconsistent. I'd search for bad wiring too.