DRobSForce
Junior Member
- Joined
- Aug 17, 2017
- Posts
- 6
- Reaction score
- 7
- Ram Year
- 2010
- Engine
- Hemi 5.7
Hello everyone! I am new to this forum, but constantly checked it in the past. My truck is a 2010 Ram with the 5.7L Hemi. I would also rate my mechanical skills at a 7/10, only because I don't frequently rip apart the internals of my engines constantly.
With that being said, I seem to be having an issue with my truck misfiring in cylinder #2. I only seem to notice the misfire when under load around 2700 RPM or higher (doesn't matter if on the road in gear or if parked and just revving the engine). If I drive the truck smoothly without any hard accelerations, I can usually not even notice the misfire. But whenever accelerating on an on-ramp or having the truck on cruise control, the misfire is quite apparent. It will usually flash the CEL and go into Limp mode until I back off for a few minutes, then the truck will run normally. Like in the post title, I do get a P0302 code for cylinder #2 misfire. That is the only code I get.
Here is a list of things that I have changed or checked:
- Changed all 16 plugs with OEM plugs. Also set the proper gap.
- Swapped ignition coil with cylinder #4...misfire did not follow to cylinder #4. Misfire still set in cylinder #2 after swapped ignition coils.
- Swapped fuel injectors between cylinders #2 and #4. Misfire still set off in cylinder #2.
- Compression test, 4 revolutions to get ~160psi in cylinder #4 and ~165 in cylinder #2. Seems to be within 10% and the values seem reasonable.
- Vacuum test to check for weak or stuck valves...~ 21 in Hg at idle and may vary very slightly and different RPMS. However, once the truck misfire and begins to set off flashing CEL, the vacuum moves down to ~15 in Hg. I'm assuming that the truck goes into Limp mode and adjusts the timing, causing the vehicle to have late timing...just a guess.
- After changing plugs, with only ~500 miles on the new plugs, the ends of the cylinder #2 plugs were a little black. The other plugs that I checked were white and cleaner looking. Maybe just a result of the misfire?
Sorry for the long post, but I am just stumped. I really am hoping that since the compression test and vacuum test looked alright, I'm praying my valve springs and camshaft is okay.
If anybody has any suggestions, I would greatly appreciate it! Thanks!
With that being said, I seem to be having an issue with my truck misfiring in cylinder #2. I only seem to notice the misfire when under load around 2700 RPM or higher (doesn't matter if on the road in gear or if parked and just revving the engine). If I drive the truck smoothly without any hard accelerations, I can usually not even notice the misfire. But whenever accelerating on an on-ramp or having the truck on cruise control, the misfire is quite apparent. It will usually flash the CEL and go into Limp mode until I back off for a few minutes, then the truck will run normally. Like in the post title, I do get a P0302 code for cylinder #2 misfire. That is the only code I get.
Here is a list of things that I have changed or checked:
- Changed all 16 plugs with OEM plugs. Also set the proper gap.
- Swapped ignition coil with cylinder #4...misfire did not follow to cylinder #4. Misfire still set in cylinder #2 after swapped ignition coils.
- Swapped fuel injectors between cylinders #2 and #4. Misfire still set off in cylinder #2.
- Compression test, 4 revolutions to get ~160psi in cylinder #4 and ~165 in cylinder #2. Seems to be within 10% and the values seem reasonable.
- Vacuum test to check for weak or stuck valves...~ 21 in Hg at idle and may vary very slightly and different RPMS. However, once the truck misfire and begins to set off flashing CEL, the vacuum moves down to ~15 in Hg. I'm assuming that the truck goes into Limp mode and adjusts the timing, causing the vehicle to have late timing...just a guess.
- After changing plugs, with only ~500 miles on the new plugs, the ends of the cylinder #2 plugs were a little black. The other plugs that I checked were white and cleaner looking. Maybe just a result of the misfire?
Sorry for the long post, but I am just stumped. I really am hoping that since the compression test and vacuum test looked alright, I'm praying my valve springs and camshaft is okay.
If anybody has any suggestions, I would greatly appreciate it! Thanks!