need help tracking down bad cop
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Senior User
Joined: Mar 2013
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From: Ocala FL
need help tracking down bad cop
Hey guys. Drove up to TN from FL last night. Truck ran great until I stopped in Chattanooga. After I started it back up I could tell it was missing slightly. Accelerated back onto the interstate and it was missing somewhat- mostly below 2500 rpm. If I dropped it down a lower gear it would clear up. I was trying to make it miss enough to set off a CEL but it wouldn't do it. Started it up today and now it runs fine again. I'd like to try and track down which cylinder it is before I drive back to FL. Any other way to track down which cylinder it is? I brought some tools and spare COP's with me lol. Have my scanner also- shows no pending or current codes. Cylinder 3 COP went bad a few weeks ago. Replaced it and was running perfect until last night. Thanks for the help.
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Just some info. I was recently told by two good mechanics COPS do not go bad . The plug wire or boots go bad and cause the misfires or engine miss. I have not tried it yet but I will the next time there is an issue.
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Joined: Jan 2004
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From: St Louis
Your two mechanics are wrong. The boots and plugs can do it, but it's often more than that. There are no plug wires.
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From: Ocala FL
I replaced the plugs about 5000 miles ago. Also replaced 3 of the boots that looked like they weren't in the best shape. All others looked great. Still no misfires again lol. Maybe it was just getting used to the cold weather 
. Probably the coldest it's ever seen. Was 23* this morning and supposed to be down in the teens the next few days.
. Probably the coldest it's ever seen. Was 23* this morning and supposed to be down in the teens the next few days.
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Senior User
Joined: Mar 2013
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From: Ocala FL
No no! I'm in Tennessee right now. Kind of looking forward to going back to the warm! Supposed to get some snow tomorrow though. First time the kids will have ever seen snow 
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capesteve
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Feb 10, 2017 07:08 AM