well to cut a long story short my SES light came on earlier today. i got my carchip and i forgot which code it was by it was my 5th cylinder misfire. so i did what would normally be protocall. check the coil pack and the spark plug. well the spark plug had some oil on it so i went ahead and replaced it with a spare plug i had gotten when i had replaced my ignition coil and spark plugs on my 1st and 2nd cylinder. but even though the coil pack had no liquid in it and i had replaced the spark plug, my SES light is still on and i still shake and rock ALOT while im in gear or on the brake. idk what else to do. any ideas?
thanks guys
SERIOUS HELP!!! PLEASE!!!!
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countryboy58
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3.5L v6
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Towncivilian
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Re: SERIOUS HELP!!! PLEASE!!!!
Still the code for 5th cylinder misfire? 2002 MY should not have the coil pack issues of the 2001.0, or at least not as frequently. Have you tried swapping coil pack #5 with any other working one to see if the problem moves? That will narrow it down to a coil pack or other issue.
Re: SERIOUS HELP!!! PLEASE!!!!
Spark plugs are the end use, the final thing to work with the ignition. A fouled plug cannot always be blamed for the fouled plug.
There are description of plugs at different stages of use, find this great picture and it will help diagnose the problem with the plug.
Cars with independent coil packs also have independent sources of problems over a plug system that uses a single coil. Because the coil pack at each plug the coils are very small in comparison to a bigger central coil and this small size makes them prone to voltage break down via, dirt, water, mixtures of dirt and water and vibration and heat.
Central coils are oil filled, larger in size but produce much more energy because they supply energy for all plugs not just one.
The production of the proper spark size and shape uses a lot of energy and these coil packs may be sized too close, that is too small for what they do, but the manufacturers of the engine can reduce costs and materials by using single coil packs as compared to the complex system that produces a spark and lat the right time for every cylinder via transistors a large coil.
These coil packs need a lot of PM compared to their bigger cousin. It would do to keep them very clean, keep oil mist off of them, atmospheric contaminants play havoc with the small surface areas and large voltage. A high voltage spark produces a track and this track produces carbon, dirt attraction and when voltage at 20,000 volts the track made can lead the voltage to other parts around the coil pack and cause it to self destruct.
These separate coils need to be very clean!
There are description of plugs at different stages of use, find this great picture and it will help diagnose the problem with the plug.
Cars with independent coil packs also have independent sources of problems over a plug system that uses a single coil. Because the coil pack at each plug the coils are very small in comparison to a bigger central coil and this small size makes them prone to voltage break down via, dirt, water, mixtures of dirt and water and vibration and heat.
Central coils are oil filled, larger in size but produce much more energy because they supply energy for all plugs not just one.
The production of the proper spark size and shape uses a lot of energy and these coil packs may be sized too close, that is too small for what they do, but the manufacturers of the engine can reduce costs and materials by using single coil packs as compared to the complex system that produces a spark and lat the right time for every cylinder via transistors a large coil.
These coil packs need a lot of PM compared to their bigger cousin. It would do to keep them very clean, keep oil mist off of them, atmospheric contaminants play havoc with the small surface areas and large voltage. A high voltage spark produces a track and this track produces carbon, dirt attraction and when voltage at 20,000 volts the track made can lead the voltage to other parts around the coil pack and cause it to self destruct.
These separate coils need to be very clean!
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countryboy58
- Posts: 2
- Joined: Sun Aug 28, 2011 10:34 pm
- Car: 2002 nissan pathfinder LE
3.5L v6
Re: SERIOUS HELP!!! PLEASE!!!!
no i havent changed it out with the coil pack. but ill try that out today after i get off work. i did go mudding in it the other day so thats why think its my coil pack cus of mud pray or something. so hopefully this will work.Towncivilian wrote:Still the code for 5th cylinder misfire? 2002 MY should not have the coil pack issues of the 2001.0, or at least not as frequently. Have you tried swapping coil pack #5 with any other working one to see if the problem moves? That will narrow it down to a coil pack or other issue.
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Chuck Tribolet
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Re: SERIOUS HELP!!! PLEASE!!!!
The OO didn't mention clearing the code. It will take about five drive cycles for it to get cleared naturally.Towncivilian wrote:Still the code for 5th cylinder misfire? 2002 MY should not have the coil pack issues of the 2001.0, or at least not as frequently. Have you tried swapping coil pack #5 with any other working one to see if the problem moves? That will narrow it down to a coil pack or other issue.
The suggestion to swap coil packs is a good one, and #5 is relatively easy to get to.
And PLEASE write down and report the numeric codes.
Re: SERIOUS HELP!!! PLEASE!!!!
The fouling on the spark-plug is rarely caused by the plug -- in most cases it is the ignition or more remotely from the engine. Same for a misfire -- rarely is it the plug starting the problem. The coils can fail a number of ways - You really did not "check" the coil ......... not sure what water you are referring to?
The problem is most likely your coil -- how many miles? We have three 02's and have never had a coil fail - Are you using the correct plug?
Worn plugs with a wide gap, incorrect plugs or too wide a gap to start with can cause coil failure.
I would clear the codes --switch the coils -- and recheck.
The problem is most likely your coil -- how many miles? We have three 02's and have never had a coil fail - Are you using the correct plug?
Worn plugs with a wide gap, incorrect plugs or too wide a gap to start with can cause coil failure.
I would clear the codes --switch the coils -- and recheck.