Question about 1989 Ford F 150

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Check engine light

I have a 1989 F150 with a 5.9L 302 V8 EFi.My check engine light was flashing, not staying on, and when I hooked up the diagnostic computer, it said the ECT sensor was bad. So I replaced it, and the check engine light still flashes. Also, before I replaed the sensor, and still now, the temperature gauge does not work. Any ideas?

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  • sriley150 Jan 19, 2009

    I'll give it a shot, thanks

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I have had many F series trucks,,they all seem to suffer from bad grounds from the battery,,and between the engine and firewall, this usualy causes the ECM to have a fit once in a while.
The cure for me many times,,was to install a heavier ground cable between the engine and the firewall,,,and also another ground cable between the negative side of the battery to the frame of the truck. Hope this helps you also.

Posted on Jan 19, 2009

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