is this a bad coil? - Ford Mustang Forum
 
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post #1 of 3 (permalink) Old 12-10-2012 Thread Starter
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Joined: Jan 2012
Location: Ft. Riley
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is this a bad coil?

I think I may have old/bad coil packs.

My car is a 1993 LX 2.3L

I changed plugs and wires last winter.

My car is somewhat hard to start normally and sometimes at stoplights it'll miss and almost stall on me. Most of my driving is highway so it hasn't been a high priority.

The weather dropped to single digits last night and this morning my car wouldn't start. It was cranking kinda slow, so I jumped it to my F150. No real change.

While cranking it is only igniting every now and then.

I can hear the fuel pump kicking on and my pressure regulator checks out OK.

Pulled a plug from Pass. side and the spark is Orange (weak)?

Is there any way to test a coil pack with a multimeter?

1993 foxbody 2.3L na Auto
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post #2 of 3 (permalink) Old 12-10-2012
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Joined: Aug 2008
Location: Monroe
Posts: 116
 
Remove your coil pack.

Check the specs of your car in a service manual to find out what the primary and secondary range of resistances are. If you don't know, just write down all of your numbers and see if one is way off.

Turn on your meter and touch the center prong on the coil pack electrical connector with one of the meter test leads, and touch the corresponding coil prong on the electrical connector with the other test lead, this is the primary resistance.

Now touch the spark plug wire terminals on one of the coils with the meter leads. This checks the secondary resistance.

If any numbers are way off in their similar sets, its bad. Secondary results will most likely be in thousands of ohms, while the primary will realistically be under 10 ohms.
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post #3 of 3 (permalink) Old 12-11-2012 Thread Starter
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Thanks Kirby

Turns out it was a multiple fault. my primary ignition coil was bad & the plug wires on cyl 2&3 were switched. I'm nearly 100% positive my local shop did that crap to create "repeat buisness". I can't stand taking my cars to shops!!

1993 foxbody 2.3L na Auto
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