Rough Idle
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Mudding
Joined: Aug 2020
Posts: 108
Likes: 23
I'd get a cheap spark plug tester from an auto store or harbor freight and check all 8 cylinders for spark. I once had a CPS going out that caused an awful rough idle, but it eventually set a fault code. Only other time I've had an idle like that was a messed up Bosch Purge Control Valve, and a bad coil pack.
TReK
Joined: May 2011
Posts: 2,768
Likes: 396
From: kitchener, canada
I'm currently staying in Sedona, gonna take my car to this Indy shop in Phoenix and hopefully they'll have the parts on hand. I did the diff seal and rear driveshaft in my hotel parking lot. I've had enough for this week in this heat. Hopefully they can fix it and I can get home and back to work. It doesn't sound like somethings wrong inside the engine to you guys?
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Mudding
Joined: Aug 2020
Posts: 108
Likes: 23
it started dripping pretty slowly and then after a day of wheeling in Moab it just started dripping out a ton of oil. Breather was melted a while ago, I replaced it. That may have been the cause
TReK
Joined: Oct 2007
Posts: 2,774
Likes: 1,982
From: Whidbey Island, PNW
Hmmm. It doesn’t sound internal to the engine (bearing etc). But I’m not too sure.
I wonder if the diff oil got in the 02 sensor harness... still seems a long shot. But that seems possible. Even with a dead 02 sensor it should run at least semi-decently on cold start in closed loop mode shouldn’t it?
And good luck. You are in the thick of it, for sure.
I wonder if the diff oil got in the 02 sensor harness... still seems a long shot. But that seems possible. Even with a dead 02 sensor it should run at least semi-decently on cold start in closed loop mode shouldn’t it?
And good luck. You are in the thick of it, for sure.
Winching
Joined: Jan 2011
Posts: 511
Likes: 142
My thoughts -
With the engine you have two real demons to wrestle - heat & oil pressure. if both of these are in normal range I would give you a 99% chance of making it home. If you have been driving in the Arizona heat without a problem I would think cooling is doing ok.
A walked cam bearing would have an impact on oil pressure I think.
If it makes power and has good oil pressure and decent engine temps throughout the speed and rpm range, go for it.
With the engine you have two real demons to wrestle - heat & oil pressure. if both of these are in normal range I would give you a 99% chance of making it home. If you have been driving in the Arizona heat without a problem I would think cooling is doing ok.
A walked cam bearing would have an impact on oil pressure I think.
If it makes power and has good oil pressure and decent engine temps throughout the speed and rpm range, go for it.
Camel Trophy
Joined: Oct 2016
Posts: 4,867
Likes: 1,410
From: Michigan
My first question would be...does your CEL illuminate when you turn the key on? If it works, and you have no codes...l'd drive it. May be a bad tank of fuel. It seems to clear out and run okay off idle, and like mentioned, the excessive noise may just be a cracked manifold or y-pipe gasket.
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Mudding
Joined: Aug 2020
Posts: 108
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No CEL, I have an UG too and I even checked pending codes. Took it to an indie (Rov N Tech) in Phoenix and they determined it was failed fuel injector O-rings. Hope that helps somebody and I hope they're right when I get my truck back tomorrow afternoon 
Winching
Joined: Sep 2010
Posts: 745
Likes: 141
From: Fairfield County, CT
With that diagnosis, I am surprised you are not throwing any codes. That is a pretty simple job if you have the time and a place to do it where it is not as hot as standing on the surface of the sun.
