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Old 01-03-2014, 16:29   #1 (permalink)
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mad OBD 1 codes

I have a 94 Ranger and it has the check engine light on now three years and no can find a problem, the codes say "primary coil circuit" but she runs great, until just recently, took her in to the dealer and they replaced the coils after I told them that was not the problem, Got it back with the CEL still on and still dropping power after paying 350.00 for nothing
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Old 01-04-2014, 07:58   #2 (permalink)
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Re: OBD 1 codes

Check your wires going back from the ignition module to the PCM, may have lost the pulse signal from the coils.

"- Faulty Ignition Coil Primary/Secondary
- Ignition Coil Primary/Secondary harness is open or shorted
- Ignition Coil Primary/Secondary circuit poor electrical connection
- Faulty Engine Control Module (ECM)
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Old 01-06-2014, 07:49   #3 (permalink)
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Re: OBD 1 codes

Again it is not the coils, Actual problem is that the vehicle will lose power intermittently and then without warning regain power. Even when she is not at full power the coils are still firing
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Old 01-06-2014, 07:50   #4 (permalink)
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Re: OBD 1 codes

and it is more prone to fail when the engine or the air temp is warm are hot, she runs great when cold
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Old 01-06-2014, 19:42   #5 (permalink)
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Re: OBD 1 codes

I did not say it was the coils. A pulse signal is sent back to the PCM every time the coil fires.
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Old 01-07-2014, 07:26   #6 (permalink)
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Re: OBD 1 codes

Thanks, after reading the link I will take a look at the harness and the Control module.
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