pacofortacos
Senior Member
- Joined
- Apr 18, 2017
- Posts
- 3,565
- Reaction score
- 4,343
- Ram Year
- 2016
- Engine
- 5.7
Remember a miss could be a dozen things. What led me to finding mine (as it was relatively an unheard of failure) was I did everything and came to the conclusion that it was a mechanical issue.
Compression test showed a couple of low cylinders, the air test indicated exhaust valve.
Even after I pulled the heads, I didn't see the problem (saw the cracks but like I said they aren't an issue). It wasn't until I removed the springs and moved the valves by hand that I saw the issue.
There were actually more bad seats than low compression cylinders.
By the time that I got rid of the truck, number 8 cylinder was getting tired and needed rings.
But it had a couple of hundred thousand miles and was run hard for many of them.
But with the right plugs, tune up and tune the 5.9 can run really well on 87 octane fuel.
Compression test showed a couple of low cylinders, the air test indicated exhaust valve.
Even after I pulled the heads, I didn't see the problem (saw the cracks but like I said they aren't an issue). It wasn't until I removed the springs and moved the valves by hand that I saw the issue.
There were actually more bad seats than low compression cylinders.
By the time that I got rid of the truck, number 8 cylinder was getting tired and needed rings.
But it had a couple of hundred thousand miles and was run hard for many of them.
But with the right plugs, tune up and tune the 5.9 can run really well on 87 octane fuel.
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