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Canadian Poncho Homepage -> Canadian Poncho -> The Lounge -> V6. No compression in one cylinder. Kid needs help.
Post Info TOPIC: V6. No compression in one cylinder. Kid needs help.
cdnpont


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V6. No compression in one cylinder. Kid needs help.
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Guys,

First off, alright, alright!...it's a FORD, a 04 Ranger 3.0. My 16 year old neighbour across the road owns it. It's in very nice shape. He's young fellow without a dad that really wants to be a mechanic, and is very eager. Just needs a little help and maybe a bit of mentoring. Perfect for a old retired guy mechanic wannabe. I enjoy helping him. It's amazing how many little things and tricks we acquire and store in the back of our minds over the years that are nice to pass along.

 

Anyway, the truck Just recently it started running rough on a trip and the check engine came on. Still drove fine, just rough. But no mechanical noises. No ticks, rattles, super quiet even with the miss.

Had it scanned at the dealership he co-op's at, got a check engine and a misfire detected in Cylinder #4, and Misfire detected at startup.

 

cp1.JPGui.JPG

 

Pulled the plugs last week and all the but #4 were absolutely perfect.

#4 was really bad. Not good. Very worrisome that it was missing the center electrode!! Is this mechanical damage? Changed all the plugs.

bad.JPG

Still running poor. Played with the wires, no change.

Pulled #4 plug for a compression check today. Dry test, no compression showing, zilch!

#3 cylinder adjacent...120.

 

What do you guys think? Bad intake lobe? Exhaust valve regressed and open? Valve stuck in the open position? Compression rings gone?

The fact the needle on compression gauge needle barely moves I feel eliminates a ring issue. Even with bad rings you'd still get a minor pump up... right? It's like there is no air in there, like the intake valve is not moving. I don't think it's a mechanical failure such as a broken piston, but who knows.

I have a scope and will have a peek in #4. Maybe see the valves as they move, the bore wall condition?

 

Any ideas to help the kid along?

 



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timbuk


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my moneys on a burnt valve

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cdnpont


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That would actually be the kids best case scenario Tim! 



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timbuk


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yes for sure pull the head or stick a cam in there for a looky maybe

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cdnpont


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I'm also seeing some things on line about a broken valve spring letting the valve stay open. But you'd certainly hear that lifter clattering away wouldn't you?

I'll edit this, the valve would be lost if the spring broke!



-- Edited by cdnpont on Wednesday 3rd of January 2024 09:41:35 PM

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if you can pull the valve cover can you see the travel of the exhaust valve for #4 ? Any chance that electrode is stuck between the valve and seat?



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cdnpont


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That could be a real possibility Kevin. 



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cdnpont


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Maybe If we introduce compressed air into #4 at it's compression TDC we might hear a hiss out the exhaust pipe?



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timbuk


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chances are you would be pulling the head for repair,however removing valve cover and airing help would help diganose there will be air leaking

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4SPEED427


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cdnpont wrote:

Maybe If we introduce compressed air into #4 at it's compression TDC we might hear a hiss out the exhaust pipe?

 I think that would be a good next step.



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cdnpont


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For anyone that cares, the exhaust valve on #4 had a large portion missing out of it's face. 

Burnt, overheated and cracked maybe? 

I think this gen of engine is plagued with this same problem. 



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oshawacliff


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Have you been out diagnosing in the freezing cold.

What a champ.

 



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Like the larger type for my eyes. 

 

 
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cdnpont


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Not me being a too soft Cliff, the kid has been though. The trooper borrowed a scope from Ford and looked in himself. 

 



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maybe check the wreckers for a replacement engine



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cdnpont


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I think he's looking at some different options Kevin. Either a wrecker motor, or pull the head and get it reconditioned.

Either way, he's working out in his grandfathers driveway. I give him credit, remember the stuff we did when we were young!

I anyone happens to know of a motor....



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oshawacliff


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oshawacliff wrote:

Have you been out diagnosing in the freezing cold.

What a champ.

 You were the spark that started this post

 



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Like the larger type for my eyes. 

 

 
timbuk


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well we all had good guesses! i think id yank the head and lap in a new valve

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