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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 09-20-2012, 12:54 PM
DPDISXR4Ti DPDISXR4Ti is offline
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Remote TFI Conversion using '92+ Distributor (4.9)

As most of us know, the factory went to a remote TFI configuration on the 4.9 starting in '92, and obviously that required a somewhat different distributor and harness. I know that electrically both setups work the same, so it's just a matter of getting things wired correctly.

There are lots of "generic" remote TFI conversion instructions out there, but all the ones I've seen are written towards converting a "regular" TFI-attached distributor to a remote setup. We have the advantage of being able to use a factory distributor and harness designed for a remote TFI, so that's what I would like to use - should be a cleaner and easier install.

Is there a write-up out there on doing this? So far I've come up empty.
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Old 09-20-2012, 04:14 PM
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Ryan has you covered: RJM Injection Tech — Remote TFI harness as far as the connectors and NEW harness.
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Old 09-20-2012, 06:01 PM
DPDISXR4Ti DPDISXR4Ti is offline
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Ryan has you covered: RJM Injection Tech — Remote TFI harness as far as the connectors and NEW harness.
Thanks, but I'm not really concerned with the parts - I've already got most, if not all of what I need. Just looking for some guidance from someone who's already walked down this path.

Might as well put some links in here. Here's one set of instructions for when you are going to continue using your existing disty....
Remote Mount TFI Ignition Module

Here's a page with lots of pics from a guy with a '90 Bronco...
1990 Ford Bronco pictures, photos, videos, and sounds | SuperMotors.net

Schematic for remote TFI...
Click the image to open in full size.

Schematic for disty-mounted TFI...
Click the image to open in full size.
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Old 09-20-2012, 07:24 PM
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Should be plug and play. If you have the harness, heatsink, TFI, and Dizzy, install it as a normal, remote TFI. You aren't really 'converting' anything over so much as changing it over. The new Dizzy and Harness should have everything you need to pop it right together (depending on what you have for remote harness); the only thing that changed was having 3 wires going from the PIP to the TFI and that's it (IIRC). Was there anything specific you were concerned with? And Good Luck!

-Mike

Also, its really the same as the other conversions you read about, but you get to use the stock dizzy connector instead of inventing a way to connect the PIP, and a stock harness, heatsink, and TFI on the other end.
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Old 09-20-2012, 10:23 PM
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Should be plug and play. If you have the harness, heatsink, TFI, and Dizzy, install it as a normal, remote TFI.
I don't want to replace the whole engine harness and IIRC the ignition sub-harness connection changed when the remote TFI went into production. So in short, I think it's not plug-n-play for that way I want to do it.

I think what I'll need to do is make a hybrid ignition sub-harness by piecing together portions of both. Just need to figure out the best way to do that.
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Old 09-21-2012, 05:35 PM
DPDISXR4Ti DPDISXR4Ti is offline
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Took a closer look at this just now and indeed the harnesses are way different between my '91 and the '93. Where the '91 has several quick connectors mounted to the driver's side splash shield, the '93 harness has one big 42-pin square connector.

It would seem that the best bet is going to be clipping out the quick connector and attached wiring that attaches to the '93 distributor and figuring out how to best patch that into my existing harness.
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Old 09-21-2012, 09:34 PM
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Upon further review, I'm now realizing that it will be easier to continue using the original distributor and make the modifications to use the remote TFI than it will be to modify the harness to use the '92+ distributor. I'd end up needing to make at least three additional cuts into the harness and run wires back and forth to use the later distributor. While that might gain me having a nice clean quick-connector coming out of the distributor, it would be at the expense of adding a bunch of wiring clutter and butt-splices elsewhere.

I guess now I'm realizing why nobody else has done this - it can be done, but the only way it makes practical sense is if you're replacing the entire harness (which is a pretty big project, cause you really need to replace EVERYTHING).
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Old 09-21-2012, 09:34 PM
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