Posted by: davidj5684

10/12/2008, 01:10pm

Great write up. I have been trying to figure out which coils are bad for so long. I followed all your steps, but am having trouble figuring out which coils are bad according to my readings (my reading look very close to the charts you show with the good coils). How do I tell which ones are bad from the numbers?

I did finally start getting a code P0301 last week- when I looked it up it said it is cylinder 1, so I "know" that one is bad, but again, it looks normal from the chart???

I took the readings on all 6 coils and cleared the codes. I switched the coils from 1 and 3 to see if I will get a code for cylinder 3 now- if I do I know it is bad, but how do I figure out the rest?

IDK if this is normal, but after I did it and cleared the codes, my engine seems a lot more responsive and almost normal? I went through a similar thing 6 months ago---i found another thread somewhere where the guy said to pull the wires off 1 by 1 while the engine is running- if the RPMs dont drop, you know its a dead coil. If they do, that coil is good. Well, I did that test and they all seemed to be good---after that testing the car seemed fine again for a few months.

I posted a pic of my coil readings here- [IMG]http://i34.tinypic.com/nzkf20.jpg[/IMG] -if someone knows how to tell which coils are bad I would really appreciate it!


Also, just as a heads up... from my research a few months ago, I also stumbled across an online petition to Nissan about this--maybe if we get enough signatures they will man up and pay for it? It can be found here... http://www.petitiononline.com/NIS_IGN/petition.html

Thanks

Posted by: markmax

01/27/2008, 10:30pm

Hey,
thanks for the thorough explanation, both on the diagnostic side and how to fix it. I have been dealing with an intermittent knock for over 4 YEARS on my 2000 Maxima! 3 dealerships, multiple mechanics. No one could diagnose it because the coils weren't completely shot. I've had my throttle body cleaned, the computer "flashed", the mass air sensor changed out (which did help correct lean left bank code), and now finally this. I have to admit I did not go through and try to isolate the bad one, I changed them all out. But after getting the exact same codes and signals as described in this blog, spark knock under load at lower RPM's in 2nd and 3rd gear, and occasionally at highway speeds. It's only been a day, but the car finally runs right for the first time in a long while. Thanks so much!!!

Posted by: PURRFCT

02/04/2006, 06:26am

Nice ride, Keep up the good work. Check out my ride sometime.

Posted by: k_c_int2003

01/27/2006, 06:06am

nice whip. keep doin ya thang. whenever you git a chance, drop by my page and hit up the gbook. defin8ly keep me posted on ya progess.

Posted by: REVS2HARD

01/26/2006, 10:49pm

I had to have the coils replaced in my 2000 but mine has a warrenty till 102,000 miles. Check mine out some time, and I like the mods so far.