Question about 1991 Ford Mustang

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Not all spark plugs firen

It has 2 coil pks the back 1 only has 2 firen and the frnt has none

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Hello have you checked the wires themselves. worst case is one bad coil pack and 2 bad wires

Posted on Feb 09, 2010

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You check the right firing order?

1991 Ford Mustang 2.3 liter SOHC L4

not all spark plugs firen - 4c687f8.gif



1991 Ford Mustang 5.0 liter V-8 HO

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Also, need check the PCM for someone short; sometimes this is the reason it wasn't sending a signal to the coil. You have constant power at the coil but the ground signal doesn't fluctuate from on to off while the engine is cranking. If the hall effects switch in the distributor is bad it won't tell the PCM when to fire the coil and the hall effect switch also operates the tachometer. So if this switch is bad the tach and the coil would not work.

Good luck.

Posted on Feb 09, 2010

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Posted on Jan 02, 2017

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REMOVAL
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Start Small work to Big = Saved Money!
The Code(s) should be telling the specific cylinder(s) that are misfiring. Do you know waht the code is?
Target those cylinders 1st before testing the unaffected cylinders.
The following should isolate the problem(s).
1. Spark plugs - take out-reconnect back to wires and test spark plugs for getting sparks. If none: Don't replace them yet. GO TO 2. If the spark plugs are worn, dirty them replace them.
2. Remove spark plugs form end of ignition wires and test for spark from the wire. If none: Don't replace them yet. GO TO 3.
3. Remove the wires from the coil connection and test the coil for spark for each cylinder. If none: Don't replace it yet.
4. Test each spark plug and wires this way.
5. Coil Packs normally provide fire for 2-cylinders at the same time. The two are paired across from one another.
6. Test the coil for fire, amount of fire and if there is both cyclinders firing.
Misfire and the O2 Sensor got replaced??
Good Luck and get back with me if you need additional help or if this solved the problem.

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