Sensor Wiring
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Sensor Wiring
I aquired a '90 F150 with some problems I need to figure out. The main one is the engine was replaced with a '93 Mustang engine and a mass air conversion kit installed, but the wiring harness with most of the sensors has been cut out! The engine runs fine for a while but then just shuts down and won't restart. I know it's because there are missing sensors. Would it be easier/cheaper to get a new harness with all new sensors or to switch to a carb and forget the electronics altogether?
Post Fiend
Joined: Nov 2002
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From: Memphis, TN
Sensor Wiring
The best move would be to put it all back to stock with good junkyard parts. Then you can find how to diagnose & repair it in a Haynes manual, and you can buy parts for it over-the-counter.
Unless you're planning on racing it, there's no reason to have a Mustang engine in a pickup. They don't make as much low-end power, which is where a truck needs it.
You could probably sell that engine as-is to someone who wants to put it into a Mustang. He'd have to expect to troubleshoot the wiring on a used converted engine anyway, so he wouldn't be surprised if it didn't run right the first time.
Unless you're planning on racing it, there's no reason to have a Mustang engine in a pickup. They don't make as much low-end power, which is where a truck needs it.
You could probably sell that engine as-is to someone who wants to put it into a Mustang. He'd have to expect to troubleshoot the wiring on a used converted engine anyway, so he wouldn't be surprised if it didn't run right the first time.
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From: Louisville,Ky.
Sensor Wiring
The Mustang engine has a Roller camshaft and a different firing order that the flat tappet Truck engine. The HO motor also uses sequential EFI and the truck uses batch fired EFI. The HO fires the injectors 1 at a time and the truck fires on bank at a time.
If you use the truck intake, and wiring harness, it should run fine. You won't need the MAF sensor though.
Jimmy
If you use the truck intake, and wiring harness, it should run fine. You won't need the MAF sensor though.
Jimmy
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Sensor Wiring
I don't plan on racing it, but the 'stang motor has less than 20k on it and is like brand new. It seemed to run strong when it was running. I assume both the original truck motor and this motor would have all the same sensors in the same locations (I'm not to knowledgeable on all the fuel inj. stuff, but I'm learning).
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Sensor Wiring
The firing order has been changed over to the Mustang, and the trucks intake is being used. It was also converted from the speed density to the mass air (including a new computer module) system with a Ford Motorsports conversion kit, so wouldn't I need the MAF sensor? The harness has some wires for the sensors cut out, but I don't know which ones.
Is there a separate harness for just the sensors that plugs into the main harness or will I have to use a complete main harness from the firewall forward?
Is there a separate harness for just the sensors that plugs into the main harness or will I have to use a complete main harness from the firewall forward?
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Joined: Dec 2001
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From: Louisville,Ky.
Sensor Wiring
You don't have to have it. Find a Mustang 5.0 and use that wiring harness. These years did not have mass-air. Mine does because I converted it over because I opened up the exhaust and plan on future mods. It will run fine on speed density if you have the brain and harness to match. I remember that I had to move a couple of wires in the harness to different pins at the ECM, then add 4 more wires for the mass air when I converted it over. I had bought all of the hard parts off of my friends wrecked 89 LX, then ordered the conversion wiring harness from Downs Ford to adapt the mass-air to the speed density harness.
You wouldn't really need the mass air unless you were doing extensive head work and installing a larger camshaft. The spped density cars were actually a tad faster because the stock mass air meter is only 55mm. The stock throttle body is 60mm. The speed density cars didn't have the extra restriction in the air path.
Jimmy
You wouldn't really need the mass air unless you were doing extensive head work and installing a larger camshaft. The spped density cars were actually a tad faster because the stock mass air meter is only 55mm. The stock throttle body is 60mm. The speed density cars didn't have the extra restriction in the air path.
Jimmy
Last edited by LxMan1; Jul 10, 2003 at 02:14 PM.
