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Old 01-13-2009, 08:20 PM
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Crank No Start

I have a 1993 Mustang that is getting a 4cyl to V8 Conversion. I'm using a 89 Mustang V8 wiring harness, it'll crank but has no spark. I have a AOD the engnine is from a 90 Mustang GT wich was my old stang that I wrecked. Computer is from the 90 Stang already tried differn't computer and still did the same. What could be the problem? Already checked TFI bought a New Coil and still no spark, could it be my Caps and Rotor haven't been changed for over 1 year as well as the Spark Plugs 1 year. and Spark Plug Wires over 2 years. I've even switched the Dash to 89 and still did the same thing, Know it has the 93 Dash harness. There is only one plug to it its Orange and hooked up to a gray one. Black one has no plug to connect to. Car fuel pump won't prime but I'll fix that later, right know i'm just spraying Carb Cleaner in Intake Manifold and still won't have any spark.

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Old 01-14-2009, 12:32 AM
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There is a inertia switch wired into the fuel pump curcuit. Make sure this is hooked up, or your fuel pump will not run.

It also sounds like your ignition module is bad.

Then again you could have a bad EFI Main Relay, and or, a Fuel Pump Relay.

The 1989, and the 1990 Mustangs wiring at the computer/ECU are different.

Get both years schematics and trace the wiring, change the pins around at the computer/ECU connector.
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Old 01-14-2009, 11:42 AM
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Also check to make sure your block has a good chassis ground. I had the exact same problem with my '70 Nova.
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Old 01-14-2009, 10:45 PM
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Do you have 12v power at pins 37 and 57, 12v at red wire circuit to injectors, IAC valve, and hot side of coil red wire?
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Old 01-15-2009, 07:25 PM
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Quote:
Originally Posted by carsavvycook
There is a inertia switch wired into the fuel pump curcuit. Make sure this is hooked up, or your fuel pump will not run.

It also sounds like your ignition module is bad.

Then again you could have a bad EFI Main Relay, and or, a Fuel Pump Relay.

The 1989, and the 1990 Mustangs wiring at the computer/ECU are different.

Get both years schematics and trace the wiring, change the pins around at the computer/ECU connector.

Any good website you recommend?
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Old 01-15-2009, 09:15 PM
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Quote:
Originally Posted by GrimReaper
Any good website you recommend?
This one! There may be other people on here, that can post the different schematics for you. I cannot right now, my scanners are broke, and so am I.
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