Question about 1991 Plymouth Voyager

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Two cylinders not firing.

Hey Chris,
I appreciate your quick response. I thought that it might be the coil also, but since i'm not familiar with these type of coils I figured I would ask someone who is. I just tried another coil,but there is no change. I can hear all the other injectors ticking but #3 & #6. They all have power going to the injectors, but no ticking or fire to the #3 & #6 sparkplugs. Any other idea's?
I appreciate your help, Thanks!

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  • chrislawrie2 May 11, 2010

    Hi JD,



    Ok I am assuming you have removed the spak plugs and found you have no spark at the tip of the plug on cylinders 3 and 6 and as you have replaced the ignition coil already it looks that we have a fault with the control side of things.



    The ignition coil is controllled by PCM (Engine Control Unit). I think you may well have a 4 pin connector on the Ignition coil. I do not have any wiring diagrams so unable to tell you exactly what each wire is for, however one of the wires will be permanant 12V supply when the engine is running which is supplied from the auto shutdown relay and will very likely be the same colour as the common coloured wire to each of the injectors ( hope this makes sense).

    The other 3 are control wires for each internal coil within the coil which I suspect are switched earth circuits from the PCM.



    If you are able to obtain wiring diagrams I suggest carrying out a resistance test on the wires from the ignition coil to the PCM.



    If these wires are OK, I think you have a problem with the PCM.



    Regards Chris and good luck

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The ignition system consists of an ignition coil, spark plug wires and spark plugs.
The crankshaft position sensor signal is the basis for ignition timing calculations. The alternating voltage signal from the crankshaft position sensor is digitized by a pulse former within the powertrain control module. This digitized signal is then used to position the closing time of the primary circuit of the ignition coil.
Ignition timing is determined by the powertrain control module in response to engine operating conditions based on stored data tables or maps. Once ignition timing has been determined, the powertrain control module interrupts the current to the primary circuit of the ignition coil thus triggering the ignition spark which is supplied to the cylinders through the spark plug wires and spark plugs.
The ignition coils are triggered by the powertrain control module in pairs (cylinders 1 and 5, cylinders 4 and 3 and cylinders 2 and 6) sending one ignition spark to the firing cylinder and one ignition spark to the corresponding cylinder on the exhaust stroke. This ensures that any unburnt fuel residues remaining in the cylinder on the exhaust stroke are re - ignited to provide cleaner exhaust emissions.
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1 Answer

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Is it cylinders 3 and 6 that are not firing? As it is quite likely that the ignition coil is common for these 2 cylinders. Although the coil is one unit I think it has 3 coils that are shared ie cylinders 1+4 2+5 and 3+6 share each coil internally.

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