Survey- For those with misfire issues

[ShadowsPapa]

The TSB is done and the misfire is gone.

That was pretty quick!
Was it Stew's out west?

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[jebiruph]

That was pretty quick!
Was it Stew's out west?

Yes. They weren't aware of that TSB until I brought it to their attention. They inspected and compared the new and old cams and could not see any visible difference. Their conclusion was it's probably a tone ring issue.

 

[ShadowsPapa]

Yes. They weren't aware of that TSB until I brought it to their attention. They inspected and compared the new and old cams and could not see any visible difference. Their conclusion was it's probably a tone ring issue.

Hope they got it - but it makes me wonder - did they mic it for the profile or just look for appearance?

 

[jebiruph]

It was just visual observation, he said there was no visible wear of the lobes. Inconsistent readings from the tone ring seems to match my symptoms.

 

[ShadowsPapa]

It was just visual observation, he said there was no visible wear of the lobes. Inconsistent readings from the tone ring seems to match my symptoms.

Most of the time you can tell, especially if there's no galling, etc. and there is the area on either side of each lobe that doesn't get wear they can always compare to on these so it makes sense.

 

[GrubbyBaja]

Build date: 10/2019 Rubicon, 6MT, stock.
Mileage when it first occurred: 19,500 (1st time wasn't logged, but occurred around 12,000 miles)
How many times has it occurred: This was the 2nd time. 1st occurred approximately 8 months (~7,000 miles) ago.
What exact codes did it throw: No codes were registered when I got home and plugged in my OBD reader (still trying to see if I can pull historical codes with my reader.)
Is the issue on going? Unknown
If so, what has been done to try to solve the issue? Nothing yet other than to check/seat all relays/fuses in fuse block.
Was the issue ever fully resolved? Unknown
Description of misfire: Driving along a SE Alabama 4-lane highway (minor hills to level) at approximately 67 mph, 6th gear, with cruise control set. Outside air temp ~70F, oil temp ~190F, coolant temp ~194F, voltage ~14.4, all of which are normal readings for my vehicle. Cruise control deactivated, ASS light illuminated, and a notable misfire was noticed as soon as I gave it throttle to maintain speed. 3-5 seconds after noticing the misfire, the yellow check engine light began flashing. Downshifted to 5th to keep from lugging the engine, but misfire remained. Maintained 65 mph in 5th gear with a continuous misfire (felt like loss of a single cylinder as the vibration was a constant frequency). After approximately 2 minutes, the misfire stopped (engine started running normally) and the flashing check engine light stopped flashing and no longer illuminated. ASS light remained and the ASS page on instrument panel indicated to service start-stop system. Continued driving ~20 miles and turned vehicle off. Restarted vehicle and everything was normal (no ASS light). The previous event was identical to this event - it was even on the same road.

 

[jebiruph]

The TSB is done and the misfire is gone.

Well, things went downhill a few days after I got it back with misc misfires on all cylinders and a uneven idle. Back to the dealer and after a few more cam related parts replacements it looks like the problem was a defective Cam Phaser Actuator. Fingers crossed.

 

[ShadowsPapa]

Well, things went downhill a few days after I got it back with misc misfires on all cylinders and a uneven idle. Back to the dealer and after a few more cam related parts replacements it looks like the problem was a defective Cam Phaser Actuator. Fingers crossed.

How was the cam (or were the cams) themselves? Wear?
Lifters ok and correct parts?

 

[jebiruph]

How was the cam (or were the cams) themselves? Wear?
Lifters ok and correct parts?

There were no visible issues with any parts until they got to the Cam Phaser Actuator and noticed that the plunger was sticking. I'm still live monitoring the misfires with Jscan and it looks pretty good after a few short trips.

 

[Bama_Swampfox]

Well, my Overland goes under the knife this week for 18-024-21 Cam etc. It has 16,000 miles on it now with 40+ CEL/ASS faults since new at 300 miles. The faults have come in groups, sometimes thousands of miles apart and then happening daily - and then gone again.

It took almost 2 months for the parts to come in (are valve cover gaskets that rare these days?). I am still struggling with the idea that a camshaft will correct this - once it's machined, does it change? Not talking about wear. Why the erratic fault occurrences? If it was made "wrong" why isn't it "wrong" all the time?

I hope the Tech assigned to the job isn't one of my past workstall-buddies we used to call "Dr. Death" or the "Butcher". Nothing wrong with real butchers!

Anyway, I'm biting my nails and hoping for the best...

 

[Maximus Gladius]

Well, my Overland goes under the knife this week for 18-024-21 Cam etc. It has 16,000 miles on it now with 40+ CEL/ASS faults since new at 300 miles. The faults have come in groups, sometimes thousands of miles apart and then happening daily - and then gone again.

It took almost 2 months for the parts to come in (are valve cover gaskets that rare these days?). I am still struggling with the idea that a camshaft will correct this - once it's machined, does it change? Not talking about wear. Why the erratic fault occurrences? If it was made "wrong" why isn't it "wrong" all the time?

I hope the Tech assigned to the job isn't one of my past workstall-buddies we used to call "Dr. Death" or the "Butcher". Nothing wrong with real butchers!

Anyway, I'm biting my nails and hoping for the best...

Question, …did you happen to have to top up you coolant every once in a while ??? Maybe a slooooow internal leak perhaps?
Ever do an oil analysis?

 

[Bama_Swampfox]

Never needed coolant added and oil stayed clean - never had it tested though.

Always runs great with all temps normal. Getting almost 23 mpg at highway speeds on flat ground. Never felt any serious misfires just an occasional lump at idle.

All faults were set at idle speed or just off idle - never while at road speed. Usually just after start up.

 

[ShadowsPapa]

Well, my Overland goes under the knife this week for 18-024-21 Cam etc. It has 16,000 miles on it now with 40+ CEL/ASS faults since new at 300 miles. The faults have come in groups, sometimes thousands of miles apart and then happening daily - and then gone again.

It took almost 2 months for the parts to come in (are valve cover gaskets that rare these days?). I am still struggling with the idea that a camshaft will correct this - once it's machined, does it change? Not talking about wear. Why the erratic fault occurrences? If it was made "wrong" why isn't it "wrong" all the time?

I hope the Tech assigned to the job isn't one of my past workstall-buddies we used to call "Dr. Death" or the "Butcher". Nothing wrong with real butchers!

Anyway, I'm biting my nails and hoping for the best...

The way these operate it could be a malfunction in another area caused it to be in the wrong lift mode at the wrong time. Also - there's a fine line between no misfires and a misfire. I can understand a cam just beginning to go not causing constant misfires, depending on many other conditions. I've seen people drive for a long ways on a cam starting to go and not realizing there's any problem at all.

 

[Bama_Swampfox]

Got my Gladiator back from dealer this afternoon. Camshaft replaced, no visible damage, scoring, etc. No other parts replaced per the RO.

Maybe it’s my imagination but the idle seems smoother during my ride home. Fingers crossed ?

Under the hood all seems to be back in place so let’s see what happens over the next few thousand miles and I’ll update the forum.

 

[jebiruph]

Got my Gladiator back from dealer this afternoon. Camshaft replaced, no visible damage, scoring, etc. No other parts replaced per the RO.

Maybe it’s my imagination but the idle seems smoother during my ride home. Fingers crossed ?

Under the hood all seems to be back in place so let’s see what happens over the next few thousand miles and I’ll update the forum.

Mine is definitely smoother after the camshaft replacement and the followup repair. Silky smooth idle now, barely hear or feel it.

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