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Unread 12-23-2011   #1 (permalink)
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Default 1991 Mustang GT 5.0 Turns over but will not start

Coming home from Christmas shopping in my 1991 Mustang GT 5.0 it suddenly died at a stop light. Like someone turned the key off. I tried to restart the car but all it does is turn over. I turned the key off and back on the fuel pump made it power up noise but it still is only turning over. It doesn't appear to be firing. Does anyone know the first basic checks to perform and the direction to take after these checks? I have a Haynes manaul but the wire diagram does not match this car. The wires on the T.F.I. ignition module do not match this manual.

I'll be online all night any helpful info will be appreciated.

Happy Holiday's
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Unread 12-23-2011   #2 (permalink)
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The first check is the fuses. See your glovebox owner's manual for info. Blown fuse means something is wrong. But change it with a correct amperage one and see if it holds when you start the engine. If all works, great. Might have been a flukey problem. But carry spare fuses with you at all times.

If there's no blown fuses: I'd get at the easiest spark plug wire you can reach, and pull it. Put a good spark plug into the boot, and crank over the engine and see if you have a spark there (touch the ground electrode of the spark plug to a bare metal spot on the engine). That's to confirm if the ignition module is putting out. If not, check for power coming to the module. If there is, the module is suspect. If there is no power, then the ignition switch is suspect, even though the fuel pump gets power and the engine cranks.

These ideas are just to help you get started with the troubleshooting, and are general in nature.
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Unread 12-23-2011   #3 (permalink)
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try the ignition coil that same scenerio happend with me def let me know curiouse
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Unread 12-23-2011   #4 (permalink)
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All under the dash fuses look good. No spark from the ignition coil. I did the ohms test on the coil and the reading was good. Next test - I'll try to test the signal coming from the ignition module.

Thanks for the replies.
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Unread 12-23-2011   #5 (permalink)
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Dead coil sounds like your issue.
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Unread 12-23-2011   #6 (permalink)
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Check to make sure uve got power to the coil. It will be the red wire the green is your trigger/tach wire. I thers power then its the module on the distributor not telling the coil to fire.
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Unread 12-24-2011   #7 (permalink)
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Red wire on the coil shows 12 volts. I'm thinking the ignition module or the PIP sensor.
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Unread 12-24-2011   #8 (permalink)
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Module has 12 volt and a good ground. Looking for LED tester to check feed to the coil and the PIP sensor.
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Unread 12-24-2011   #9 (permalink)
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I replaced the ignition module with a new one but this did not resolve my issue. Has anyone replaced a PIP sensor. Any instructions would be appreciated. Does the distributor needed removed?
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Unread 12-25-2011   #10 (permalink)
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Jw have u checked the stupid stuff? Cap rotor wires make sure both wires are making good contact with the coil lugs.
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Unread 12-26-2011   #11 (permalink)
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your first move is to pull a spark plug wire, now have someone crank the engine while you hold the wire boot near something metal...see if you see sparking: if so continue to step 2...
2: Next pull the hose off the throttle body and spray some starting fluid into the throttle body, see if the car will fire one time
You now know if it's spark or fuel, if it's not one of those, time to see a mechanic
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Unread 12-29-2011   #12 (permalink)
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My issue was that I had nothing at the coil. So I wasn't getting back to the distributor. The ignition module was not the issue. Instead of replacing the PIP sensor in the distributor I replaced the whole unit. Actually I replaced it twice. The first remanufacted unit had a issue. After installing the second unit the car fired right up. I set the timing and drove it into work, It's running great.
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