Question about Saturn SC1
97 saturn sc1, #1 cylinder not firing, new coil, sprk wire good, #4 is fine, online article says circuit 633 brn/wht wire volt check, no such circuit that I've found this harness/model. what would be the suggested next step besides pin out of cable wire by wire?
Vin "7" or '9"???if #4 is firing so is #1. they both fire at the same time. have you swapped the wire with number 4 or another cylinder? have you checked for a injector pulse on #1 fuel injector? Compression on #1 Cylinder?
Posted on Oct 01, 2009
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Posted on Jan 02, 2017
Tips for a great answer:
Inspect the EIS towers and plug the wire connections for corrosion or other signs of poor retention at connections.
The electronic ignition (EI) module supplies a signal to the PCM whenever it determines that the #4 cylinder fired on its compression stroke. Because of opposite coil tower polarity, the simultaneous fir of #1 and #4 cylinders are of opposite polarity as well. Under most conditions, except decel, the waste spark cylinder fires before the compression cylinder in sequence. The EI module can determine this polarity sequence and voltage amplitude by using capacitive pickup plates located under the 1/4 coil. If the module senses a positive to negative sequence and high negative spike when #4 is on TDC, it pulls the PCM cam signal to ground signaling that #4 has just fired on compression. This signal along with the double pulse received from the CKP sensor, synchronizes spark and fuel timing.
Beside plugs , plug wires need to be replaced as well !
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