Question about 1999 Ford Explorer

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I have replaced my plugs, plug wires,and ign. coil and it still is missfirering and running bad especialy when i go up the mtn help me please

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  • Master
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If it is not indicating a code you are pretty much in the dark ,it may be too rich of a mixture take a plug out to see if it is black or very white, just for the hell of it take it to auto zone or advance and try reading a code sometime a hard code is stored and it can point you in the right direction so you don't spend money on unneed parts, next step buy a compression tester and see if the ***** is pushin at least 120 psi on all six anything under 90 is not good

Posted on Jul 03, 2009

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  • Ford Master
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Try LUCAS fuel additive and 2 bottle of heet with a small amount of gas premium if possible run untill u get down low on fuel or untill problem is gone

Posted on Jul 03, 2009

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I have a 97 plym grand voy. 3.3 v6, it has new ignition coil, new spark plug, new crank shaft sensor, new camshaft sensor, but it missfire the cilinder n3 and n6, check the wires from the pcm to the ign....


Not likely. With 3 cylingers out, it would not run. When you have one coil, and spark different at any plug, it has to be wires. Not unusual to have 2 bad wires. Switch with one thought to be good before buying anything. Check the voltage at suspect injector, with test light. Should flicker. If flickers, swap injector with one thought to be good. Buy only parts known to be bad by comparison.

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Missfire in cylinder 2


I assume you know the problem is a misfire in #2 cylinder from checking the diagnostics code. Although these codes can be helpful in narrowing down a problem they lack specific details. In the case there are several possible items that could trigger the engine fault code P0302

These include:
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  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
Before you spend any money to resolve this you need to narrow this list down even more. Start by pulling the plug. Do a image web search on "spark plug diagnosis". This will give you pictures of plugs with a variety of problems to compare with yours and give you an indication whether or not the plugs need replacing. Next if possible switch #2 plug wire with another. Make sure you switch both ends (coil end and spark plug end) of the spark plug wire.
These are the no or low cost options. Beyond these you will need to start replacing items like the Ignition Coil and O2 sensor.
If you are still having the problem after checking and/or replacing the items listed above, your next step is a compression test on #2 cylinder.
If you get to this point please repost here with the results with the wires and plugs and I will give you the steps to follow with compression testing.
Hope this helps.

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I have a 97 plymouth voyager van that dies out while going down the road we have replaced that converter, plugs wires cap rotar and it is now saying multi mis fires is it a bad o2 sensor


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