tfi wire diagram

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May 14, 2010 | 09:50 PM

tnfarmer67

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tfi wire diagram

i bought a f150 4x4 about 5 yrs ago and it came with a 302 , the truck was originally a 6 cylinder truck. i'm swapping it back to a 4.9 and the one i have has the tfi ignition on the distributor. my wiring harness is in pretty bad shape, i need a diagram for the tfi. i'm going to use a points distributor til i get a diagram. i wanted one wire dist. but i'm not going to spend $400.00 ill just have to have less power with the points. i only use the truck to pull my boat .any help ould be appreciated

May 15, 2010 | 12:48 PM

JimsRebel

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From: Washington

Quote:

Originally Posted by tnfarmer67

Will you have to change the computer if you stay with the TFI?? Is a 302 the same as a 4.9 computer? Carb or EFI engine? what year truck?
I would just use a duraspark dist and a ignition module of your choice.
Cheapest would be a GM 4 pin module.

Dirt cheap Ignition

May 15, 2010 | 09:03 PM

tnfarmer67

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the 4.9 came out of a 86 and i'm putting it in a 85 and its is a carb. the dirt cheap ignition looks really good. update, i was tring to install the 4.9 but needs motor mounts they wont be in till monday

May 15, 2010 | 09:35 PM

JimsRebel

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From: Washington

Quote:

Originally Posted by tnfarmer67

cheapest dist is on ebay for $55,with cap and rotor and free shipping, that is where I got mine... but it only lasted 2000 miles before the roll pin on the gear sheared, the gear is still in the bottom of my oil pan.

Photos of mine.

May 16, 2010 | 11:27 AM

tnfarmer67

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i see you have two of the gm 4 pin modules ,i'm guessing there is an extra one just in case one fails. and if it is how often do they go out. i have a duraspark dist. in a spare engine so thats definitely what i'm going to do. and the heat sinks you have did you buy them somewhere or did you make them . i have some 1/4 inch aluminum if i double it should be enough. thank for the info

May 16, 2010 | 11:50 AM

JimsRebel

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From: Washington

Quote:

Originally Posted by tnfarmer67

The heat sink is from a computer CPU, my local computer repair shop sells used ones for $1. I cut the heat sink in half (was square) and the 4 pin modules are junk yard used stuff, so it was just as easy to make an extra spare while I was at it. If the 4 pin module is heat sinked well it wont have any failure issues, heat is the only issue. I have beening running this setup for over 2 years without a failure. But I DO like having spare parts on hand, ready to go. Use heat sink compound under the 4 pin module, the auto parts store will sell it.

NAPA OnLine sells the 4-pin HEI ignition module, ECHTP45, for ~$39 + shipping. These are also widely available as Wells DR100, Niehoff DR400, Standard part numberLX-301 (~$28); or AC DELCO D1906 (~$33), and were used on many non-computer GM V-8s, V-6s and I-6s from 1975 to the mid 1980s. <O