Question about 1998 Ford Expedition

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I had a cylinder 2 misfire

I changed the plugs and wires and its still reading cylinder 2 misfire.what now?

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  • 3 Answers

Check the spark plug lead and follow back from there.

Posted on Apr 24, 2013

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Posted on Jan 02, 2017

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chuck943
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SOURCE: engine code p0307 cylinder #7 misfire

It could be carbon deposits on valve seats keeping valves from totally closing. You can try getting you a can of motorcraft PM3 top end engine cleaner and get engine up to operating temp then remove one of the small vacuum lines from the intake and draw the contents of the can slowly into the engine.After you have drawn in the contents shut engine off and let it soak for about 45 minutes then crank it back up and let it run until it clears. Now it will smoke like a forrest fire while you are doing this so don't be alarmed,just tell the neighbors you are spraying for mosqitos.This may cure the problem. If not you may be looking at a valve job.
This can be verified with a compression test if this is what is causing it.

Posted on Feb 05, 2009

  • 255 Answers

SOURCE: misfire in 1 & 2 cylinders after changing wires plugs and coil

since the problems appeared after the work, it is in the work. prob is in wires or plugs.. take no 1 plug out put it back in wire terminal, re install one of you old plugs into no 1 cylnder have someone turn eng. over ck for bright spark repeat for no 2. make sure plug gap is correct. if no fire to you plugs. then you know what to do replace the wires.

hope2help shack

Posted on Apr 16, 2009

SOURCE: My 98 ranger is still misfiring on cylinders 2 and

most likely the coil or ignition module

Posted on Dec 11, 2009

daves944
  • 1050 Answers

SOURCE: Cylinder 2 misfire - probably spark plug or wire

This should help:

6dca732.jpg

Posted on Feb 19, 2010

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  • 510 Answers

SOURCE: ODB reader states PO302 , #2 cylinder misfire.

po302 is also injector fault on cyl 2

Swop injectors check codes to see if problem has changed

Posted on May 31, 2010

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What DTC code(s) are you getting?
You performed a compression test on cylinder #1; did you test cylinder #2?
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Hi Yvonne, I'm glad to help!

The first step when you have a misfire is to see what is causing the misfire. Technicians always rules out mechanical failures before moving on too Electrical issues. What you need to do is check compression on cylinder 2 and see if its good. Remove the spark plug and test it with a compression tester. It should read somewhere around 150 PSI or more. Check it to cylinder 4 and make sure the reading are close they must be within 25 %. If the compression is GOOD then you'll need to move to the electrical checks. Here's how you rule out parts. It doesn't matter if you have plug wires or coil-on-plug. SWAP the parts from cylinder 2 to cylinder 4 and start the engine and if the misfire moves from 2 to 4 then you know its either the spark plug the spark plug wire or the coil pack if you have a coil instead of a plug wire. If the misfire does not move and stays in cylinder 2 then it could be an INJECTOR, WIRING ISSUES, COMPUTER DRIVER. As you see Yvonne it can be a lot of things that can cause a misfire. Hope this helps and have an awesome day Yvonne.

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-Last number corresponds to which cylinder is misfiring.


Could be a faulty spark plug or wire. Try changing the spark plug from the 4 Cylinder to another and see what happens; If the different cylinder misfires, then it is the spark plug. If not, it could be the wires on cylinder 4.

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Why is my 1997 expedition showing a misfire on number 2 cylinder OBD code PO302. Also I am getting code readings PO174 andPO171 system to lean on Bank 1and 2


PO302 is being a misfire, could mean the plug is bad or the coil is bad for that cylinder. Which can give you the misfire reading and the system to lean codes. Check the #2 coil for firing.

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Misfire in 1 & 2 cylinders after changing wires plugs and coil


since the problems appeared after the work, it is in the work. prob is in wires or plugs.. take no 1 plug out put it back in wire terminal, re install one of you old plugs into no 1 cylnder have someone turn eng. over ck for bright spark repeat for no 2. make sure plug gap is correct. if no fire to you plugs. then you know what to do replace the wires.

hope2help shack

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MY #2 CYLINDER IS MISFIRING ON A 2004 F-150 SUPER CREW CAB


Check spark plugs and wires. Could also be defective Coil.
I recommend replacing all plugs and wires at the same time.

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