Question about 1996 Oldsmobile LSS

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I keep getting code num 1 cly miss fire i have changed the spark plug wires fuel injector the coil omes out ok what else am i missing

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  • Master
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A compression test should be taken at least of the # 1 cylinder to be certain that there is no mechanical mis-fire, and if the compression is good then the ignition module located under the ignition coils is most likely faulty or there could be a missing tooth on the tone ring for the crankshaft sensor. That is the DTC P0301 that you are having a problem with?




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Posted on Nov 07, 2010

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  • Oldsmobile Master
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Is code P0300 then check the crankshaft pisition sensor. Its front bottem of engine near the lower belt pully, The hormonic balancer it is the sensor the is first to read a misfire in the system hope this helps

Posted on Nov 07, 2010

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If you are saying everything is ok when the engine first starts but number one starts to miss when at operating temp. Sounds like the number one coil has developed a internal crack that opens up when hot or at operating temp..causing a miss.change it.but before changing the coil check the spark plug wire it may be breaking down when hot..good luck

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What do I do next? My 2001 olds alero 3.4l v6 is misfiring constantly. Scanned obd2 error code p0301. Already changed spark plug, wire, and coil for cylinders 1 and 4. Still have same problem.


I recommend checking all injectors and O rings on the injectors if an O ring cracks air can raise Cain with misses so can injectors another thing is cam to look at will cause a constant miss but only on 1 cylinder at a time but doubt its the cam. check injectors and O rings also pull 1 plug wire at a time with wire pliers while engine is running and find the 1 cylinder that is giving you the problem when you pull the plug wire that is missing the engine will smooth out then that cylinder is your problem wear rubber gloves with the plug wire pliers so you dont get bit let me know if i can help please rate my solution as this is how i earn my achievements on fixYa thanks.

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Have you done any troubleshooting here ?
Is the plug getting spark from the coil ?
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My 2004 chevy trailblazer is missing badly. Had them read the code for me at auto zone and it said I had a miss fire on the number one cylinder. I changed the plugs and it is still missing badly


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#1 plug is miss-firing.I have replaced plug and wire,but keeps miss-firing only on#1 plug.have been told that coolant is possibly getting in #1cylinder.also I have been told #1 coil could be bad.witch is...


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I have an 2002 buick century that has a iginition miss. We have changed the spark plugs, iginition wires, coil pack. It first came back with a miss fire number 2 cyclinder. The coil pack was changed. Now...


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What is the meaning of 98 Honda Civic error codes P0300 P0303 P0304? Engine will not start, does not seem to fire.


P0300 indicates that there is multiple miss fire in the ignition system. P0303 and p0304 indicates the miss fire is in cylinder #3 and #4. Replace the spark plug, and wire set, and rotor and cap if there is one. Can not remember if there are coil packs on the civic, the age thing. change the fuel filter and clean out the fuel injectors with fuel injector cleaner for the next 3 full ups. When the spark plugs are removed, inspect them for condition, if there clean or dirty with carbon build up. which would indicate how the engine is running. Keep me posted and drive safe.

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