pin out diagram of the 42-pin connector needed, one that shows what the wires are for?

1997 FORD MUSTANG
58,000 MILES • 3.8L • V6 • 2WD • AUTOMATIC
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HOTSTANG
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I'm attempting to use the original harness. I put an old school 302 into my car. I'm using the original 4R70W transmission that was in the car. I'm trying to hook up a tachometer adapter so the tachometer in dash will work. I'm also thinking the transmission will need signal for shifting purpose.
I have a HEI distributor and hooking up a Glow Shift HEI adapter. I got a pin out diagram of the 42-pin connector from a local Ford dealership. It gives me wire colors but not what they are for.
Sep 5, 2022 at 10:45 AM
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HOTSTANG
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This is what I received from Ford.
Sep 5, 2022 at 12:57 PM
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JACOBANDNICKOLAS
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Hi,

That is what I have for a pinout as well. However, I went to the powertrain management schematics and basically copied each page showing the PCM. You will need to identify the pin number on the pic.

I'm not sure if this is what you needed because you indicated a 42 pin. If it is a specific module you are referring to, let me know

Let me know if this helps.

Take care,

Joe

See pics below.
Sep 5, 2022 at 8:31 PM
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HOTSTANG
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This is the 42 pin connector I'm referring to. It's where the engine harness plugs into. It's located pass rear of engine compartment. That's the actual plug off engine harness I cut off.
Sep 6, 2022 at 4:54 PM
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HOTSTANG
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Ford dealership gave me wire color but not what they're used for. I figured out TPS I have to hook up. I have those wires separated already. I have to figure tachometer adapter now.
Sep 6, 2022 at 5:03 PM
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JACOBANDNICKOLAS
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Hi,

Okay, I'm glad to hear you got it figured out. I was under the impression you needed the pinout for the PCM.

Regardless, If I can help, let me know.

Take care,

Joe
Sep 6, 2022 at 6:43 PM
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HOTSTANG
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I'm just making sure I'm correct in my thinking. From what I've read the crank sensor sends the signal to coil packs to fire the plugs at the right time. It's also what sends signal for tach. It also generates its own signal so no actual voltage is needed.
So, in my thinking with what you sent me pin 21 would be the signal wire for tach and pin 22 is a ground more or less. I would just need to hook a switched power wire to my adapter.
Sep 7, 2022 at 9:01 AM
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HOTSTANG
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Just to let you know what I am building. There's an article in Motortrend called 400 HP 302 on pump gas. Check it out sometime. Mine is an '85 GT block bored 30 over and decked 15 thousandth. I have GT40P heads shaved 8 thousandth and upgraded springs. The intake is a Typhoon with a 1" spacer plate and a Carter/AFB 605s carb. In the article he got 401 hp with stock heads. My GT40P'S I'm guessing 425-450 hp.
Sep 7, 2022 at 9:56 AM
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JACOBANDNICKOLAS
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Hi,

Wow, that's a lot of HP from a 302. LOL Let me know how things turn out for you. I will check out the posting in Motor Trend. It sounds interesting.

Take care,

Joe
Sep 7, 2022 at 6:52 PM
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HOTSTANG
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Did you see my question above that? I believe I'm correct in my thinking but not 100% sure.
Sep 7, 2022 at 6:54 PM
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JACOBANDNICKOLAS
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Hi,

I didn't see that one. As far as the crankshaft position sensor, yes it provides an engine RPM signal that is used for two things, the crankshaft in 10-degree increments, and engine RPMs.

This information is sent to the powertrain control module to determine ignition timing and engine speed. From there the information is sent to the tachometer.

Take care,

Joe
Sep 7, 2022 at 8:41 PM
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HOTSTANG
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I have the motor back in the car after replacing the crankshaft. Original crank was bad.
I came across this spacer plate somewhere. I've collected parts all over the place. Would you have any idea what this would be for? I've tried to Google different spacers. One I found somewhat similar said it was for water/methanol injection. I'm thinking about NOS down the road and I'm wondering if this would be usable. There are two holes on the inside, one in each Venturis.
Sep 13, 2022 at 6:35 PM
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JACOBANDNICKOLAS
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Hi,

That is certainly a spacer under the carburetor. As far as the openings are concerned, I suspect it could be used for NOS or a vacuum supply. Keep in mind, you just replaced the crankshaft. If you start using NOS, you may damage the new crank or one of the connecting rods. That applies a lot more pressure to everything.

Your work looks great. Let me know when you get it started. I'm anxious to hear it. LOL

Take care,

Joe
Sep 13, 2022 at 8:45 PM
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HOTSTANG
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You'll hear the whine of timing gears. Going to be a little bit before I fire it again. I want all electronics hooked up and operating. Running the 4R70w transmission needs some signals to operate. Old school engines never needed many electronics. Why I went single wire HEI distributor.
Sep 13, 2022 at 8:54 PM
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HOTSTANG
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With original crank. I didn't hurt anything with it. Didn't have much run time. Wouldn't hold oil pressure so it got tore down and new crank and bearings installed which I got from Crankshaft Supply Co.
Sep 13, 2022 at 8:58 PM
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JACOBANDNICKOLAS
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Hi,
Wow, that sounds good. Is the whine the timing gears? That is a little louder than I would expect.

Let me know.

Joe
Sep 14, 2022 at 5:53 PM
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HOTSTANG
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Yes, that is the gears. That is the noisy ones. I bought them and the scoop off Facebook Marketplace. He only had 10 mins I was told. They are in very good shape and fit snug like they should. The guy didn't like the noise. I don't mind it.
I never got into the throttle much. I kept an eye on oil pressure and seen it wasn't holding so out it came.
Sep 14, 2022 at 6:10 PM
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JACOBANDNICKOLAS
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They are loud. It sounds like you have a blower on it. LOL

Regardless, take care, and let me know if I can help in any way.

Joe
Sep 14, 2022 at 6:43 PM
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HOTSTANG
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https://www.jegs.com/i/Trans-Dapt/969/2431/10002/-1

I found my spacer plate.
Sep 14, 2022 at 8:47 PM
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JACOBANDNICKOLAS
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Hi,

That works. LOL I thought you had one already that you planned to use.

Joe

Sep 15, 2022 at 5:49 PM
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HOTSTANG
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I do. I believe that is similar to mine. Mine is just missing the little groves. That could be resolved.
Sep 15, 2022 at 6:51 PM
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JACOBANDNICKOLAS
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Well, you are better off with what you did. At least you will know if there is an issue. Otherwise, if you are like me, you would question the modifications you made if anything happened. LOL

Regardless, take care of yourself.

Joe
Sep 16, 2022 at 7:59 PM
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HOTSTANG
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Not sure if you read that article yet. I told you what I built. What cubic inch would you say I have? I never figured that out. I fired it after the new crank rebuild today. It's a scary ride. I need a better rear yet. Still 7.5 v6 rear in it. I nailed it idling in low gear. I had to let off. That's just in development where I live. It's not street legal yet. I had it sideways twice also.
Oct 1, 2022 at 8:07 PM
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HOTSTANG
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Yes, you see the wire screen under the spacer plate. Helps break up the fuel to a vapor. Old school trick.
Oct 1, 2022 at 8:17 PM
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HOTSTANG
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It's a ride for days. Looking for a better rear. V6 rear still in it. 7.5 ring and pinion won't hold up long.
Oct 2, 2022 at 6:59 PM
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JACOBANDNICKOLAS
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Hi,

It looks like it would be a heck of a ride. LOL And I agree, you are going to destroy that differential. It may take a while, but it will happen.

Take care of yourself, and no driving over 45 MPH. LOL

Joe
Oct 3, 2022 at 7:55 PM
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HOTSTANG
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Good luck with 45 MPH since most roads around Hiawassee GA is 55 MPH. You want to build a Ford motor look at that article but use Gt40P heads. You don't need a big cam to be dangerous. Nice Typhoon intake and a little 600 cfm Carter/AFB carb. I'll put you back in the seat and laugh.
Oct 3, 2022 at 8:02 PM
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HOTSTANG
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All low end hp and torque mixed with straight timing gears that don't fluctuate. I have mid-range hp and torque to back it up. Not sure if low end or midrange is worse.
And sucking in cold air.
Oct 3, 2022 at 8:08 PM
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HOTSTANG
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Upgrade the springs in the heads. Stock springs suck. I'm running dual springs and shaved 8 thousandth. 58 cc heads beefed up. Block bored 30 over and decked 15 thousandth on a 1985 stock GT block. Ford is King!
Oct 3, 2022 at 8:13 PM
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HOTSTANG
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I forgot to say my pistons are a 30 over chevy 350, yes turned backwards. They're not a Ford piston. I have no clue of compression ratio between pistons and heads. 10+:1 ratio or higher? Who knows?
Oil pressure stays good and electric fan don't run much.
Oct 3, 2022 at 8:31 PM
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HOTSTANG
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And the screen helps to break up the fuel. I'm 61 years old and follow old school techniques.
Oct 3, 2022 at 8:40 PM
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HOTSTANG
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I have the best documentation possible, I got pics to prove what I have.
Oct 3, 2022 at 8:57 PM
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HOTSTANG
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I didn't go cheap on break in. Only oil going in this motor is Amsoil. Staying straight 30 probably. See how their product really is.
Oct 3, 2022 at 9:04 PM
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JACOBANDNICKOLAS
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Hi,

Amsoil is an excellent product. I hope things are still going well.

Take care,

Joe
Oct 6, 2022 at 7:00 PM
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HOTSTANG
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I'm looking for a dyno in my area. This thing is crazy. Stump it idling in low gear and it smokes the tires.
I'm also looking for someone to make me a sunshade decal for my windshield. Frankenstein.
Once it's street legal, probably spring, I'm going to see if I have enough to take a 2022 5.0l Stang. They run the Coyote motor. I think I can take it once I get my car to hook up. My 7.5 stock v6 rear won't get it done.
Oct 6, 2022 at 7:14 PM
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HOTSTANG
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It's a handful to hang onto if you get into it.
Dec 4, 2022 at 5:48 PM
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HOTSTANG
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Legal for road now. It's so fun to drive, lol. Sorry I forgot I sent the video already. I'm getting the little things fixed slowly.
Dec 22, 2022 at 10:50 AM
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JACOBANDNICKOLAS
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Hi,

That's great news. I'm glad to hear it. It looks somewhat intimidating. LOL I bet it's fast as heck.

Take care of yourself and I hope you and your family have a great Christmas.

Joe
Dec 22, 2022 at 10:25 PM