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Sorry for the crappy pics. I found this last year when I was tearing down/rebuilding my car. This was in the trunk shoved up against the back seat. I just re-found it in my drawer and realized I still dont know what it is.

Motorcraft
F1SF - 12A297 - C1A
3J25A

It has 6 pins and it looks like it mounts to something somewhere with the 2 screw holes. Anyone got a clue?
 

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1997 Thunderbird 4.6, 1998 Mark VIII LSC
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Ignition control module.
 

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Is it for this vehicle? I swear I google'd the part number when I originally found it and got nothing. I thought it was some kind of tester. Do I need this or can I toss it?
 

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Considering its in the wrong end of the car, its probably junk and was discarded in the trunk.
 

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1997 Thunderbird 4.6, 1998 Mark VIII LSC
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Yup, your car has one. It wouldn't run without it, so that being in the trunk means either it was a spare in case of failure or an original that failed.
 

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Hmm, I'll just hold on to it then. Back in the drawer...

Thanks.
 

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Hmm, I'll just hold on to it then. Back in the drawer...

Thanks.
Good idea. It may be good, it may be bad but it being in the trunk -assuming there wasnt a bunch of other junk back there- tells me that the owner knew a little something about TFI's and wanted to avoid being stranded and having to pay excess bucks to get it replaced. Good heat sink grease between it and where it's mounted is VITAL.

The fact it's Motorcraft is a good thing. Aftermarket parts were notorious for 'early failure' esp where they were distributor mounted. The reason why EECIV MN12's have them mounted on a remote heat sink.

BTW, couldn't hurt to check to see the grease is still greasy and not caked.

I'm lazy and never have.. simply because it's remoted and much less prone to grease degassing due to engine heat. Typical life on a mustang 2.3 or TC was about 110K. Every failure coincided with finding the grease 'caked'. Conversely, an OE TFI built 86 {IIRC} or later will probably never fail if it hasnt been caked.

On an XR4, lifetime without servicing is much less because of the underhood layout/geometries. Dunno for sure about 5.0 but seemed {according to Mustang NG} to be less than you would expect.

I want to clarify: 'some' ..especially where brand name started with 'W'..aftermarket non-Motorcraft TFI's would fail WITHOUT caking.

yet more*: I'd say next time you're doing detail underhood, check the sink grease for your TFI, While you're at it plug in that spare and see if engine starts right up. I'd guess 95 % of all OE TFI failure was the coil driver transistor, again, due to cking and too much heat. With the -ahem unnamed - after market one I had one that was intermittent miss above 2000 or so RPM. I'd far rather use an old Motorcraft than a new in box aftermarket. In fact a lot of Mustang guys raided junkyards to pick 'em.
* Sorry if I give you more info than you wanted but my experience is all I got to offer right now.
 
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