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Old 06-26-2010, 18:40   #1 (permalink)
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pcm/efm fuse 98 5.4 expedition

Fuse 24,a 30a fuse under the hood keeps blowing. It happens as soon as I turn the key. I took out all relays then started adding them in 1 at a time untill it blew again. The eec power relay is what does it. Anyone know what I need to do to fix this lol. Im not sure whats causing this or how to fix it. please help lol. Its a 98/99 expedition with a 5.4 and 4x4 if that helps. its also green..... i know that doesnt matter but what the hell, i was giving all the other info.
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Old 06-26-2010, 19:38   #2 (permalink)
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Re: pcm/efm fuse 98 5.4 expedition

That relay when triggered, runs power to the engine components, ie. injectors, MAF, O2 sensors, and more. There must be a wire shorted in the engine compartment. Look at the whole harness and see if it's against something and grounding the wire. I'm pretty sure it's red.

You didn't mention if it had alloy wheels? LOL Don't worry about the info. you mentioned. It's better than not enough.
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Old 06-26-2010, 21:17   #3 (permalink)
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Re: pcm/efm fuse 98 5.4 expedition

thanks, some time in the morning I will look at it again. I checked out alot of wireing under the hood and didnt see any issues. I was going to hit a junk yard and pick up as many things the run on that circut as I could find lol.
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Old 06-26-2010, 21:21   #4 (permalink)
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Re: pcm/efm fuse 98 5.4 expedition

You can just unplug them all and start plugging them in. I believe you'll find a wire rubbing through though. Look on the Autozone website, they should have a digram and see what's all on that circuit.
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Old 06-27-2010, 08:06   #5 (permalink)
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Re: pcm/efm fuse 98 5.4 expedition

I have the haynes book but I have no clue what im lookin for lol
and could the problem be the eec its self?
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Old 06-27-2010, 09:51   #6 (permalink)
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Re: pcm/efm fuse 98 5.4 expedition

The only time I've ever seen a ECM short out was when a guy drilled a hole into it to mount an aftermarket part. You can even check for sure by unplugging it. I'm still guessing that it's the harness.
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