00 4.6 Expedition... starts but shuts off right away - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
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post #1 of 12 (permalink) Old 04-30-10, 02:58 PM Thread Starter
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confused 00 4.6 Expedition... starts but shuts off right away

I have a remote start paging alarm.... I upgraded m alternator to a 200amp yesterday to help power my stereo system a little better (over 6000 watts) When I got the new alternator on the truck will start... run a little rough sometimes, and 5 seconds later will shut clean off... I changed the alternator back to the stock 130 amp and its still doing it? The theft light comes on when I start it now and I have been told its the chip in the key... I have the box that relocates that key to under my dash and when I take the key out of the box it wont fire at all... so i dont think it is that.... also my headlights and parking lights quit working in the front.... any ideas from you Subject Matter Experts out there? I used to be a learning mechanic but have been in iraq for the better part of the last 7 years and I fear I am out of practice....
Thank you much
Jason

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post #2 of 12 (permalink) Old 04-30-10, 06:21 PM Thread Starter
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Re: 00 4.6 Expedition... starts but shuts off right away

i got relays clicking all over the place and one of them acts like it is on steroids when i turn the ignition to run and after the truck dies..... please someone help me
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post #3 of 12 (permalink) Old 04-30-10, 08:07 PM
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Re: 00 4.6 Expedition... starts but shuts off right away

Have you checked all the fuses? How about the grounds on the engine and elsewhere? Look at the connections near the alternator that might have gotten loosened with the replacement work.

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post #4 of 12 (permalink) Old 04-30-10, 11:34 PM Thread Starter
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Re: 00 4.6 Expedition... starts but shuts off right away

I have checked all the fuses... I will check the grounds at first light... thank you very much.... Also I got a diagram and it is the ECM relay that goes spastic when I turn the key on and after the truck shuts off.... it clicks probably 30 times if not more within a second or so as soon as i turn the key to run.... maybe ECM got shorted somehow? Is there a way to test or maybe reset it?
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post #5 of 12 (permalink) Old 05-01-10, 07:52 AM
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Re: 00 4.6 Expedition... starts but shuts off right away

No way to test the ECU without special equipment. You could go to AutoZone and see if they can pull any codes. The don't charge for that.

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post #6 of 12 (permalink) Old 05-02-10, 01:46 AM Thread Starter
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Re: 00 4.6 Expedition... starts but shuts off right away

yah I have to get it there to get them to pull the codes..... i think im gonna buy a PCM at the wrecking yard tomorrow to double check it.... i checked all the wiring i had access to and replaced the relay and it still makes the PCM relay go haywire....

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post #7 of 12 (permalink) Old 05-02-10, 01:47 AM Thread Starter
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Re: 00 4.6 Expedition... starts but shuts off right away

i guess we will see what monday brings *crosses fingers*

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post #8 of 12 (permalink) Old 05-02-10, 07:29 AM
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Re: 00 4.6 Expedition... starts but shuts off right away

Good luck. Keep us posted.

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post #9 of 12 (permalink) Old 05-02-10, 02:09 PM Thread Starter
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Re: 00 4.6 Expedition... starts but shuts off right away

thanks!

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post #10 of 12 (permalink) Old 05-02-10, 03:09 PM
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Re: 00 4.6 Expedition... starts but shuts off right away

you said you relocated the box that contains the key, did you use big enough wire for the 12v and ground?
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