Question about 1998 Ford Explorer

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Code reads mis fires in all cylinders - 1998 Ford Explorer

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PO300 or random multiple misfires. Most of the time will mean the coils are going bad. The Ign. coils brake down due to age and heat. The coil pack cost about $50.00 at a local auto parts store. Hope this helps Fixya up.

Posted on Mar 30, 2011

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Your ignition timing is incorrect. The distributor needs to be adjusted (******/advance) louden the bolt on the distributor, then with the car running turn it to the left our the right untill you get the desired effect. Then disconnect your battery for 15 minutes to clear the code. Please rate the solution as helpful if this solution helps you out. Thank you for your question.

Posted on Mar 30, 2011

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This sounds as if you have a vacuum leak, check all the lines and check the intake. There are a lot of things that will cause mis fire. mis fire code is triggered when the ecm reads a very slight difference in the time the crank sensor picks up a signal. Mis fires can be from electrical, vacuum, mechanical, and eletronic sources. If you can get it to a person/shop that read which cylinder are misfiring this helps alot, narrows the field. Let me know I can help. Also it helps to know what engine we are dealing with

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Dodge obd code p0305


The DTC (Data Trouble Code) P0305 is the generic OBD-II DTC for "Cylinder 5 Mis-fire Detected", and it means that the OBD-II control unit has detected a problem with the #5 cylinder.

The problem could be a faulty spark plug, or a spark plug wire for the #5 cylinder, or the coil for that cylinder could be faulty (2.7 liter), or the distributor or distributor cap could be faulty (3.0 liter), or the fuel injector for the #5 cylinder could be faulty.

Before you look for any electrical problems causing the mis-fire on the #5 cylinder, first do a compression check to be certain that the mis-fire is not caused by a mechanical problem.

Here are the firing order diagrams for the 2.7 and the 3.0 liter enginesto help assist you.


2.7 liter

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3.0 liter

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Check Engine Light on Yr2001 Ford Escape V-6 2wd. Code says: Misfire on cylinder #5. Dealer said compression is low in cylinder #5. This Escape needs to pass smog. What can we do?


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If the engine really does have low compression on the #5 cylinder then that is caused by a mechanical mis-fire and nothing electronic will repair it, and the most common causes for a mechanical mis-fire would be a burnt or bent intake or exhaust valve, a warped cylinder head or damaged head gasket, or a damaged piston. You can call around and find a repair shop that will do a "compression leak down test" if you want to know exactly what is causing the compression leak without any dis-assembly to the engine.

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Standing in front of the vehicle, what are the cylinder numbers. I have a mis fire on #2 cylinder per engine code reading p0302


They're numbered like this:
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Try changing the plugs or coils from #2 into a different cylinder. If, for example, after changing, you get a different code such as PO305, you'll be able to pinpoint the issue and cylinder its coming from. If you don't own your own code reader, autozone rents them out. Sometimes they'll lend it for free depending on who you get.

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Reads codes of po300,po302,po303,po305


Hi these are mis-fire codes ,
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P0303................3........
p0305..................5........
I would check your spark plugs first if Ok you need to make sure the coils are working ok for this you need an osciloscope to check output voltage if your not sure then take to a qualified mechanic with Cadilac experience it could be caused by an air leak,bad ECT sensor or even Mass air flow sensor ,codes only tell you the result not the cause

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