Hey guys,
I've been experiencing the same issue's as the above post and have seen some of the same complaints about the coil packs ins the VQ35 pathfinders. I figured I'd do some experimenting and start a write-up as the what the codes are and what the fix is.
Current symptoms:
Vehicle runs rough when the SES light is blinking
Once warmed up the SES light turns on solid and the vehicle runs fine.
SES code p1320 (ignition signal primary)
SES code p0302 (misfire 2cyl)
Diagnosis:
Engine is not firing on 1 or more cylinders due to either a bad coil pack or spark plug.
Fix:
I am starting with new plugs. From what I read, NGK irridiums are the recommended plug. If this does not fix the issue I will replace the coil packs and report back.
I replaced the plugs last night and all 6 were gapped between .070 and .080 (spec is .044). I also swapped coil pack 2 (suspect coil) with coil pack 6 to see if the problem follows the coil pack. The engine didn't miss when I started it up. A trip around the block showed no significant power increase and it didn't run any smoother than prior th the misfire issue's. Of course it never ran poorly except when it threw the misfire code so I wasn't expecting a huge improvement here.
One question on the coil packs. From what I read, the dealer sells them for about $100 each. NAPA sells them for $72 for P/N ECHIC460 (cylinder 1) and $79 for P/N ECHIC457 (cylinder 2-6). An ebay vendor sells the full set for $220 under P/N 22448-8J115 which is manufactured by Karyln/STI.
Now for some questions:
Has anyone used any of the parts listed above?
The set for sale on EBAY says it's compatible with Any VQ35DE engine, however NAPA has a different part # for the coil packs for the 02 maxima and the 02 pathfinder (the only two I checked on the NAPA website. Others may also be different). Are the coil packs from any VQ35DE engine compatible?
Is there a reason that coil 1 is different than coils 2-6?
Coil packs 1 through 6 all have the same part number (22448 4W000) and have NISSAN stamped on the side. The one difference is the connector location. The connector for coils 2-6 is on the side of the coil pack, while the connector for coil 1 is on the top. At this point I am going to order the set of 6 off EBAY and worst case I will have to order the #1 coil through NAPA. Then I will always have a spare.
Any confirmed information is appreciated. I'll also include a write-up on the replacement once all the information is figured out.
Bigmatt