After replacing the #5 cylinder coil about a month ago I have the P0300 again ... the first time I actually took all 6 coils out and tested them with the volt meter I just came across a video online that shows a different method... Just wondering if anyone else has tried this.

http://www.youtube.com/watch?v=z37jl4HXQjg

 

I too had code P0300 and thought that the coils were bad. I tested them and all were ok. I cleaned up the TB and cleared the code. That fixed it. If your idle is low it will throw that code b/c of misfiring. If your car is a 2000-2001, you should check the iacv or the throttlle pos sensor. Also try to clean the TB.

 

about a month ago when I was testing all coils I also replaced the oil, filter, cleaned the K&N filter, cleaned the cold air intake and also the TB, even that the TB looked pretty good for a car which has 167,xxx miles. I know that it is a misfire because this morning when I started the car I got outside to clean all the snow from last night, about 5 min after I fired the car I was still cleaning it and I could clearly hear the car misfire ... probably tomorrow I will run outside and do the test with unplugging the connectors also about a week latter i had another stored code P1320..

 

I am pretty sure that I am dealing with another bad coil here again... for the past week the temperatures here in Ohio were crazy low, a few morning after starting the i check the tem outside and somewhere between 8 to 10 crazy cold, but the car cranked and started with absolutely no hesitation but then after a few min it will cut/misfire sometimes it even happened while I was driving mainly in second gear

 

Been having a little mixture here and there haven't checked nothing out yet but will do what you've tried cause think I got a bad coil also.

 

for those who are trying to save some $ on coils, I just got a BWD (Part No E393 ) coil from Advance auto for $40 for front, they are $63 regular use coupon "BIG25"

you can get coupons at (just type advance auto in search field)
slickdeals.net

example
http://slickdeals.net/forums/showthr...id=0&t=2908107

there is also there sale on Actron AutoScanner OBD II Code Reader (Part No. CP9575) came out at $70 (use 30% off on $100, the scanner is 99.99 so you will need to get something for $1 to get to $100)

 

I can tell you this, DO NOT user aftermarket coils, they will not take away the SES light. i found that out the hard way, you have to buy OEM nissan coils only. and they can't really diagnose one coil, you really just have to replace them all.

 

wrong

 

about a month ago I end up calling Dave B and ordered 6 new coils (gray dot)
My car is back to normal now, after taking a 3,000 mile trip with the in-laws not problems, no lights, no hesitations, great gas millage close to 450miles on full tank of gas with 4 people inside the car and trunk full to the top, the car looked like it has a 3inch drop on the back