Check by moving the spark plug, then wire (or COP)

[kevin]

check engine light has been going on for the misfiring #4 piston ,so I changed the #1 plug wire and sparkplug with the number 4 ,so far there has been no there has been no misfire, any were , good , spark plug wire ends to the spark plugs have a little play ,,they could fit tighter ,spark plugs look ok, so I well wait and see ,what happens ,be fore making my next move, I think ,it seem easier right now ,I do not have all the stuff to do all the suggestion ,made from you all ,thank by the way,

Topic

[Mathieu]

Try to warp around a peace of rubber tape and aluminium tape around the plug to eliminate the play in aftermarket part. I hope It’s will help.

[EricTheCarGuy]

In my experience misfire codes aren’t always accurate when it comes to a specific cylinder. That said, I usually start with a power balance test when confronted with a misfire to help nail down a problem cylinder. I outline this process in this article that contains a video on how to perform a power balance test.

http://www.ericthecarguy.com/faq/solving-automotive-performance-issues

Good luck and keep us posted on your progress.

[kevin]

Ok at this point I have switched the #1 and #4 spark plug and wires to see if the misfire in #4 piston was the in the spark plug or the spark plug wire and for awhile there was no check engine light ,then the check engine light went off and it still said misfire in#4 piston ,so it seems its not the spark plug or sparkplug wire,so I did the balance test pulling off the spark plug wires off one at atime to see if one of them would have no change when pulled off and they all did as they should made the motor run rough and changed when pulled off , and listen to the injectors with my stiffascoup and they sounded good to me like each other the same,now I need to see if I can do the next thing on that page, thanks

[EricTheCarGuy]

Thanks for the update. Don’t forget about a mechanical issue. Spark and fuel are only part of the equation. You could also have a vacuum leak or other mechanical problem causing the misfire. The article I posted for you should have additional information on all of that.

Please keep us posted on your progress.

[kevin]

did vac test with carb cleaner and water no vac that I could find ,done spark test by spraying with water on dest and spark plug wires no spark that I could find ,check engine light went off ,I bet its mis fire in #4piston have not checked yet will to marrow thanks

[EricTheCarGuy]

Sounds like a plan. Keep us updated.

[kevin]

well I did a compression test on #4 piston and it was low between 70 and 80 and there was a lot of sound coming coming out of the spark hole when the hole was cover ed I could not hear the sound

[Author]

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