Question about Cars & Trucks
Have the battery & alternator tested
Appears to be ecm voltage issues
Posted on Dec 12, 2012
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Posted on Jan 02, 2017
check transmission fluid.change fuel filter and air filter.try changing up on where you buy gas .because bad gas causes problems.
Posted on Jun 26, 2009
SOURCE: code po304 #4 cylinder mis fire
ck if you have spark at the coil for that cylinder. check the plug wire closely. if it has spark at the coil, then replace all the spark plug wires.
Posted on Oct 12, 2009
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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