One bad coil causes multiple misfires
#1
![Default](/forum/images/icons/icon1.gif)
I spent the day chasing down a tricky problem. I had a flashing check engine, rough running, and P0301, 0304, 0305, 0307, 0308, 1313, 1314, 1316.
I was looking for common issues like fuel, common wires, CKP, throttle body, MAFS, multiple valve cover seal leaks that might cause multiple misfires; all to no avail.
Then I noticed when I reset the codes that P0305 (cylinder 5 misfire) always came up first, then the others would eventially follow. I moved the number 5 coil to cylinder 3 and then P0303 would come up first. I moved this coil to cylinder 2 and then P0302 would come up first.
I replaced this coil and all is perfect.
So the conclusion is that in some failure modes, one bad coil can cause multiple misfires!
I was looking for common issues like fuel, common wires, CKP, throttle body, MAFS, multiple valve cover seal leaks that might cause multiple misfires; all to no avail.
Then I noticed when I reset the codes that P0305 (cylinder 5 misfire) always came up first, then the others would eventially follow. I moved the number 5 coil to cylinder 3 and then P0303 would come up first. I moved this coil to cylinder 2 and then P0302 would come up first.
I replaced this coil and all is perfect.
So the conclusion is that in some failure modes, one bad coil can cause multiple misfires!
Last edited by WhiteXKR; 11-17-2012 at 07:17 PM.
The following 4 users liked this post by WhiteXKR:
Thread
Thread Starter
Forum
Replies
Last Post
scooternva
XJ XJ6 / XJ8 / XJR ( X350 & X358 )
20
09-27-2023 11:25 AM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)