#5 cylinder misfire & secondary coil ground fault

It's going to be something electrical, specifically in the harness for cylinder 5. Likely something intermittent, which makes finding it with a continuity check difficult.
One thing you can be sure it's not, though, is your new key.
 
Even if I get it to act up then check power or continuity it’s all working fine. If I reset code it runs good for 30 seconds. Check engine light comes back. Check for power or continuity when it’s messing up it comes up fine. When I picked it up from last mechanic it was missing then a minute later it smoothed out for rest of drive. When it missing computer it shutting fuel injector off. I was thinking maybe it thinks it’s being stolen that’s why I thought about key. It also started about 1 hour after new keys programmed.
 
Chris81579 said:
Even if I get it to act up then check power or continuity it’s all working fine. If I reset code it runs good for 30 seconds. Check engine light comes back. Check for power or continuity when it’s messing up it comes up fine. When I picked it up from last mechanic it was missing then a minute later it smoothed out for rest of drive. When it missing computer it shutting fuel injector off. I was thinking maybe it thinks it’s being stolen that’s why I thought about key. It also started about 1 hour after new keys programmed.
Click to expand...
The Wrangler does not, to my knowledge, have an engine cut out if it is stolen. And if it did, it would shut down the entire engine, not just one cylinder. And there is absolutely nothing in the key that will cause a single cylinder misfire.
 
  • Like
Reactions: tJKrider
This is my engine harness had the whole thing out it must be in the body harness the wire for number 5 had no resistance I would hook meter up and shake wire around to see if it lost connection did it to all coil pack wires

IMG_0854.jpeg
 
Top Bottom