Mult Cyl Misfires - Spark Plugs or Coil Packs?
#1
Mult Cyl Misfires - Spark Plugs or Coil Packs?
I'm getting misfires on cylinders 1, 2, and 4 pretty regularly and I'm trying to diagnose what's going on. The car seems to run smoothly during normal driving, but WOT will cause misfires, some smoke, and backfires.
I initially thought it was my Denso 5353 spark plugs (I wanted a colder plug because of Accessport tune). I took them out last night to check for fouling, but they seem to be fine. I'm attaching some pics of the spark plug from the #1 cyl for more opinions.
Other than the spark plugs, I noticed that cyl 3 never misfires. Last year I had a coil pack fail and I'm pretty sure it was #3. So that leads to my next question: do coil packs need to be replaced as a group? Is it possible I have 1 new coil pack and 3 weak/old coil packs that aren't performing under full load?
Let me know what you guys think.
I initially thought it was my Denso 5353 spark plugs (I wanted a colder plug because of Accessport tune). I took them out last night to check for fouling, but they seem to be fine. I'm attaching some pics of the spark plug from the #1 cyl for more opinions.
Other than the spark plugs, I noticed that cyl 3 never misfires. Last year I had a coil pack fail and I'm pretty sure it was #3. So that leads to my next question: do coil packs need to be replaced as a group? Is it possible I have 1 new coil pack and 3 weak/old coil packs that aren't performing under full load?
Let me know what you guys think.
#2
#3
Bad gas is out of the picture, I've been to multiple different stations over multiple months and the issue persists.
#6
#7
Yes they can, especially if moisture has got in. Pull them out and have a look at them. You can sometimes see a lot of rust around the base of the metal, or cracking in the sleeve. If you notice a big difference between the 3 older ones and the newer one then that is a sign they are getting old
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#8
+1 on the rust and the moisture on the coil . I have seen them pulled out and rust and cracked.
The MCS coil have that metal sleeve, the Cooper ( NON S ) dont. But still get crack or ground out on the insert tube on the head. Look for arching marks also.
http://www.ecstuning.com/Search/SiteSearch/12137575010/
The MCS coil have that metal sleeve, the Cooper ( NON S ) dont. But still get crack or ground out on the insert tube on the head. Look for arching marks also.
http://www.ecstuning.com/Search/SiteSearch/12137575010/
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