wayneo Posted December 10, 2017 Report Share Posted December 10, 2017 my 2013 edge limited was running fine... yesterday i went to start it , and it was running rough and then the check engine light came on, i hooked it up to the "fixed" app and it says the cylinder # 6 is miss firing any ideas what it could be Quote Link to comment Share on other sites More sharing options...
Mikula Posted December 10, 2017 Report Share Posted December 10, 2017 (edited) how many miles on it? i always check the spark plug first. that can usually give you an answer. after that i check injectors and then go to ignition and compression tests. just because it pulled a code for cylinder 6 doesn't mean it is always that cylinder. reset the code and check again when the code comes back, just to be sure its not a random cylinder. though most new cars throw a code that says it is random misfire, just make sure! Edited December 10, 2017 by Mikula 1 Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted December 10, 2017 Report Share Posted December 10, 2017 Assume it is the 3.5 engine, since it is cylinder 6 and Limited version. Might indeed be time to change out ALL plugs. Or a tankful of Techron Concentrate Plus might be all that is needed for now. Quote Link to comment Share on other sites More sharing options...
wayneo Posted December 10, 2017 Author Report Share Posted December 10, 2017 it has 109,000,miles Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted December 10, 2017 Report Share Posted December 10, 2017 Plugs. 90k max. Change before they burn out the coils. 2 Quote Link to comment Share on other sites More sharing options...
evh Posted December 10, 2017 Report Share Posted December 10, 2017 I'll take "Spark Plugs" for $500 Alex... 1 Quote Link to comment Share on other sites More sharing options...
Mikula Posted December 11, 2017 Report Share Posted December 11, 2017 engines are just a fancy version of the "fire triangle" (i mean, not really.. but really). Check spark. check fuel. check oxygen (really more like compression or leak down). but like i said, to start, check the plug. it may be worn out, or show signs of running lean. simply changing plugs might just be a band-aid, so take a good look at your plugs and see if there is a deeper issue. what do they look like? wet? black? brown? white? yellow? eroded? these things will give more information than we can sit here and guess about. 1 Quote Link to comment Share on other sites More sharing options...
wayneo Posted December 15, 2017 Author Report Share Posted December 15, 2017 turns out it was a bad fuel injector and all the plugs were " shot" 2 Quote Link to comment Share on other sites More sharing options...
PaulSchott Posted December 17, 2017 Report Share Posted December 17, 2017 You have to pull the intake for the injector so it's always the perfect time to do the plugs. If I had more than 50K on the plugs i would do them if the manifold was off. I would also switch the back coils to the front. IMHO It seems that the back three coils are subjected to much higher temps and their life can be extended by moving them to the front. 1 Quote Link to comment Share on other sites More sharing options...
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