Mysterious Misfire
#1
Mysterious Misfire
Hello, first time posting on here.
I have a 2014 ram 1500 Big Horn- 5.7
For about a month I’ve had a cylinder 5 misfire
Along with random white smoke from tailpipe.
After bringing it to two shops and these repairs…
plug, coil pack, injector, compression test, leak down test, and a reman pcm.
the white smoke isn’t coolant, it’s excess fuel burning.
With the compression and leak down, the technicians ruled out head gasket & block issues.
anyone have recommendation what to do next?
The truck doesn’t tick except on cold start.
cam? Lifters?
thanks
I have a 2014 ram 1500 Big Horn- 5.7
For about a month I’ve had a cylinder 5 misfire
Along with random white smoke from tailpipe.
After bringing it to two shops and these repairs…
plug, coil pack, injector, compression test, leak down test, and a reman pcm.
the white smoke isn’t coolant, it’s excess fuel burning.
With the compression and leak down, the technicians ruled out head gasket & block issues.
anyone have recommendation what to do next?
The truck doesn’t tick except on cold start.
cam? Lifters?
thanks
#3
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#9
Since you mentioned plug, coil and injector, all singular, are you sure the correctly identified cylinder 5 and replaced those on the correct cylinder? Did the spark plug from cylinder 5 look different from any others that were presumably removed at the time? Can the shop backprobe the injector and capacitively scope the ignition coil during the misfire condition? The injector backprobe wouldn't be so tough, but capacitively monitoring the secondary of the ignition coil under load without a dyno could be a challenge.
-Rod
-Rod