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Stuck Rings vs Worn Rings/Cylinder on 3.0

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  #1  
Old 08-28-2018
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Stuck Rings vs Worn Rings/Cylinder on 3.0

Hi Everybody.

I've got a 2007 Ranger 3.0 with about 160,000 on it and a persistent misfire on Cylinder 2. I did a compression test and I've got about 95 psi on cylinder 2, the rest seem to be in spec (about 150 to 155). When I do a wet test on Cylinder 2, i can get it up to about 130 to 140. I took it to a shop, and based on the results they said they think that the rings/cylinder wall are bad in that cylinder, which means a rebuild. They ruled out the valves due to the wet test bumping up the compression, and checked to make sure it wasn't the injector seal. I got the truck with 114,000 on it, so I don't know if it had gotten sludged in the past. I've kept up with it pretty well since I've had it.

My questions are:
Does it make sense that the rings and or cylinder wall would be worn that badly on only one cylinder?
Has anyone had any luck telling if the rings are just stuck and might be freed with seafoam or some other kind of solvent vs. being worn out?

Thanks,
Alex
 
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  #2  
Old 08-28-2018
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You could always remove the fuel pump relay, start the truck or try and let it die. Then remove that spark plug, pour a bunch of marvel mystery oil down that cyl and let it sit for a week if you can (lightly screw plug back in so critters dont find the open hole). Then remove the plug and crank the engine over expelling any oil that may still be sitting in the cyl( might use an old chunk of cardboard to kinda contain the potential mess) Once it blows clean put plug back and reattach the spark wire and fuel pump relay and fire it up and hope for the best. Relatively easy and cheap to attempt as you know the cost of the other end of the spectrum if the above doesn't fix it.

Only reasons i can think is part of a spark plug got in there and scored the wall, broken rings, or some other foreign object causing damage.

I hope they performed a leak down test to determine what it was. No overheating or coolant loss right?
 
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Old 08-28-2018
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Rent or buy a bore scope and have a look in the cylinder and see what it looks like.
 
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Old 08-28-2018
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Bore scopes only cost like 30 bucks these days. Very easy way to inspect the cylinder wall and piston for damage due to foreign objects, worn rings, pre-ignition, or anything else that could cause low compression. Seeing a problem with your own eyes is alot easier than guessing!
 
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Old 08-29-2018
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Yes, to Leak down test on that 1 cylinder, but just need the air pressure not the gauge, you already know there is a leak

Put piston at TDC with both valves closed, inject air pressure at the spark plug hole
Listen at tail pipe, exhaust valve leak
Listen at intake manifold, intake valve leak
Listen at Oil Fill tube, or dipstick tube, ring leak

Although a 50% increase in psi on wet compression test would indicate ring issues

Bore scope would show cylinder wall conditions, put piston at BDC

2004 to 2006 Ranger 3.0l's did have a TSB issued for Exhaust Valve Seat recession which caused a loss of compression, early 2007 could be effected, I wouldn't expect wet test increase to be 50% if this was the issue but.............it was a known issue
 

Last edited by RonD; 08-29-2018 at 01:19 PM.
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Old 08-29-2018
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Alex, just to point out, that the injectors don't effect compression.
The injectors are mounted in the upper intake manifold on the intake side of those valves and are not under the engines compression.
The simple O-ring wouldn't last long if it was designed that way.
 
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  #7  
Old 08-29-2018
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Amazon Amazon

i got one of those critters awhile back. Pretty decent and will for sure fit down the SP hole. Worth having around the house/garage.
 
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Old 08-29-2018
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Originally Posted by RonD View Post
Yes, to Leak down test on that 1 cylinder, but just need the air pressure not the gauge, you already know there is a leak

Put piston at TDC with both valves closed, inject air pressure at the spark plug hole
Listen at tail pipe, exhaust valve leak
Listen at intake manifold, intake valve leak
Listen at Oil Fill tube, or dipstick tube, ring leak

Although a 50% increase in psi on wet compression test would indicate ring issues

Bore scope would show cylinder wall conditions, put piston at BDC

2004 to 2006 Ranger 3.0l's did have a TSB issued for Exhaust Valve Seat recession which caused a loss of compression, early 2007 could be effected, I wouldn't expect wet test increase to be 50% if this was the issue but.............it was a known issue
Also dont forget Ron, open radiator cap and if the air psi goes out the radiator then blown headgasket, also remove spark plugs next to the cyl in question. If it blows out those neighboring sparkplug holes its also blown headgasket.
 
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  #9  
Old 08-29-2018
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Why do we even have these forums... Everyone should just call Ron lol. Ron could replace 99% of the idiots on youtube as well.
 
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Old 08-29-2018
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HE He !!!
Ron's Ranger-Forums
 
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Old 08-29-2018
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Originally Posted by Dngr Rngr View Post
Also dont forget Ron, open radiator cap and if the air psi goes out the radiator then blown headgasket, also remove spark plugs next to the cyl in question. If it blows out those neighboring sparkplug holes its also blown headgasket.
Excellent suggestion, totally discounted cracked head or blown head gasket.

Yes this is a good forum, many minds helping, is a very good thing
 
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