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Unread 11-05-2013   #1 (permalink)
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Default 92 mustang LX won't start

I'm new on here but looking for some insight. My 5.0 refuses to start. I've replaced the starter, fender solenoid, ignition switch and battery but when I turn the key there is nothing but silence. Anybody have any ideas to try before I spend a bunch of money at a shop?
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Unread 11-05-2013   #2 (permalink)
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does the fuel pump make a noise when you turn the key? Does it crank at all?
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Unread 11-05-2013   #3 (permalink)
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Hot wire the start relay, just be SURE it is in neutral or park.

Pull the wire to the small screw and jump it to the batter post of the start relay.

Does that make it crank?

Do all of your accessories and key controlled devices work, including the fuel pump for a second when you turn the key?
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Unread 11-06-2013   #4 (permalink)
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3 things come to mind. Check the EEC relay at the ECU itself. Theres a relay there that gets corroded over time and fails. Check the wires going into the plug too to make sure they didn't corrod or fall out too.

Same thing at the fuel pump relay. Check both the wires behind the plug and the relay itself. Sometimes the wires and relay become corroded and faulty. Sense yours is a 1992, the fuel pump relay will be next to the MAF sensor in the engine bay.

Check the Inertia switch in the hatch/trunk area of the car. Usually sits behind the hatch panels in front of the drivers tail light. Theres a button there that sometimes becomes faulty (the relay itself).

Lastly, has the car ever had its transmission out? If its a manual did you plug the trans harness in? Theres an NSS circuit there that wont let the pump turn on if it isn't closed (ie clutch pushed in).
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Unread 11-06-2013   #5 (permalink)
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Check the Neutral Safety Switch.
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Unread 11-07-2013   #6 (permalink)
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The fuel pump does wimd up and all the lights work, radio comes on.
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Unread 11-07-2013   #7 (permalink)
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Where is the trans harness located? I did put a new exhaust system on and if its around that I might have disconnected it on accident. I know I didn't purposely unplug anything except the O2 sensors.
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Unread 11-07-2013   #8 (permalink)
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Its on the trans and in the trans valley under the car. Drivers side. There should be 3 plugs. VSS sensor, Reverse light sensor and NSS switch.
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Unread 11-07-2013   #9 (permalink)
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Thanks. I'll take look at it this weekend. Hopefully that does the trick.
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Unread 11-09-2013   #10 (permalink)
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OK. So the harness was unplugged. Put it back but still won't start, but I do get a single click when I turn the key.
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Unread 11-12-2013   #11 (permalink)
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If I am picking up on whats going on, you are not getting the engine to crank at all. Have you tried by passing the starter relay all together just to see if the battery will turn the starter? I am thinking with the tranny work, the starter may be in a bind, and cant spin as it should, or the battery is getting poor contact. Bypassing the relay should activate the starter, even with the key off.
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Unread 11-12-2013   #12 (permalink)
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92's have a bad history of the mini starter and the wiring being confused. Make sure the starter wires aren't on the same terminal. Sounds like you almost have it. Simple issues now. The harness was your main issue.
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Unread 11-24-2013   #13 (permalink)
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Finally got it started. Problem was an exposed wire on the ignition switch harness. Made contact somehow and it fried the computer. Thanks everyone for your tips and advice.
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