Intake Valve or?
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Senior User
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From: Agawam MA
Intake Valve or?
Truck has been running great for a couple of weeks, driving up a hill yesterday, it starts lugging, loses power, and idles really rough... I nursed it home 30 miles this way.
Upon inspection, the Air cleaner is thumping in time to the motor and puffing air, you can actually feel it at the mouth of the snorkel.
Cracked the injectors, all made the engine miss more, but when I cracked #2 the thumping quieted down.
Do I have an intake valve problem on #2?
I have a compression tester on order, but wanted to get an initial diagnosis from "the experts" Thanks!
Upon inspection, the Air cleaner is thumping in time to the motor and puffing air, you can actually feel it at the mouth of the snorkel.
Cracked the injectors, all made the engine miss more, but when I cracked #2 the thumping quieted down.
Do I have an intake valve problem on #2?
I have a compression tester on order, but wanted to get an initial diagnosis from "the experts" Thanks!
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Senior User
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From: Agawam MA
I was hoping you would say it was an injector since the noise went away when I loosened the injector line...
Funny thing is, this all started after filling my new fuel filter with Diesel Kleen, starting it, and letting it sit overnite. The very next trip I got about 5 miles until this happened.
Methanoholic
Joined: Mar 2009
Posts: 6,442
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From: Maine (NorCal Native)
Diesel Kleen didn't do it ...
Pull the rocker cover and check the rockers on #2, remove the rockers, remove the Glow Plug, apply shop air to the glow plug hole ... Careful, the motor will turn over until the pressurized cylinder is at BDC.
-Enjoy
fh : )_~
Pull the rocker cover and check the rockers on #2, remove the rockers, remove the Glow Plug, apply shop air to the glow plug hole ... Careful, the motor will turn over until the pressurized cylinder is at BDC.
-Enjoy
fh : )_~
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From: Agawam MA
Thanks!
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Senior User
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From: Agawam MA
Update:
Ok, took Valve cover off, inspected rockers, pushrods etc, seemed to have wear, but nothing insane, ran the engine and observed the valve train, seemed normal. The knock coming from the intake is insanely loud with the air cleaner off. If I loosen #2 injector fuel line, knock goes away, but runs rougher...
Put compressed air down glow plug holes with rockers loose... I put some Saran Wrap over the intake with a rubber band so I could see if it was getting air... Every cylinder on the drivers side made the Saran wrap inflate a bit when I put air in the glow plug hole
I reassembled the rockers and started it again, still knocking, still #2...
Some smoke/vapor was coming out of the intake when I shut it down last...
I have a compression tester on order, I guess I do that next?
Can all my intakes be shot? The truck ran good up until 2 days ago...
Ok, took Valve cover off, inspected rockers, pushrods etc, seemed to have wear, but nothing insane, ran the engine and observed the valve train, seemed normal. The knock coming from the intake is insanely loud with the air cleaner off. If I loosen #2 injector fuel line, knock goes away, but runs rougher...
Put compressed air down glow plug holes with rockers loose... I put some Saran Wrap over the intake with a rubber band so I could see if it was getting air... Every cylinder on the drivers side made the Saran wrap inflate a bit when I put air in the glow plug hole
I reassembled the rockers and started it again, still knocking, still #2...
Some smoke/vapor was coming out of the intake when I shut it down last...
I have a compression tester on order, I guess I do that next?
Can all my intakes be shot? The truck ran good up until 2 days ago...
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
Toss the plastic wrap ... That indicates nadda!
Listen for gushing air, you'll likely hear them all leak a little, #2 should gush, either out the exhaust or intake ...
If you have the whole bank of rockers loose and all glow plugs out then blow in one, listen, blow in the next, listen, etc ...
Cylinders never have a perfect air tight seal, however that doesn't mean every engine builder doesn't try!
-Enjoy
fh : )_~
Listen for gushing air, you'll likely hear them all leak a little, #2 should gush, either out the exhaust or intake ...
If you have the whole bank of rockers loose and all glow plugs out then blow in one, listen, blow in the next, listen, etc ...
Cylinders never have a perfect air tight seal, however that doesn't mean every engine builder doesn't try!
-Enjoy
fh : )_~
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From: Agawam MA
Ok, well, that is interesting, since the reason I put the plastic wrap there was I couldn't hear any of the cylinders leaking, so I figured it was too small to hear, which is why I put the plastic wrap on...
Now I am really confused!
Now I am really confused!
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Lead Driver
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From: So. Jersey
If you are thinking (or hoping) it's an injector, simply take the "problem cylinder" injector out and swap it to another cylinder and see if the problem follows the injector. If it does, then it's the injector.
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Joined: Oct 2006
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From: Welland, On
whenry912, I have got the same problem but I don't know what it is yet. I am in the process of doing an engine swap right now, but when I get a chance I will be doing a leak down test. You might want to read the thread I started:
https://www.ford-trucks.com/forums/9...of-intake.html
some great info from some very knowledgeable people and some lively discussion. I will be posting my finds when I get to the leakdown but for know I want to get my truck on the road. I will be following your post. Thanks
https://www.ford-trucks.com/forums/9...of-intake.html
some great info from some very knowledgeable people and some lively discussion. I will be posting my finds when I get to the leakdown but for know I want to get my truck on the road. I will be following your post. Thanks
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From: Agawam MA
whenry912, I have got the same problem but I don't know what it is yet. I am in the process of doing an engine swap right now, but when I get a chance I will be doing a leak down test. You might want to read the thread I started:
https://www.ford-trucks.com/forums/9...of-intake.html
some great info from some very knowledgeable people and some lively discussion. I will be posting my finds when I get to the leakdown but for know I want to get my truck on the road. I will be following your post. Thanks
https://www.ford-trucks.com/forums/9...of-intake.html
some great info from some very knowledgeable people and some lively discussion. I will be posting my finds when I get to the leakdown but for know I want to get my truck on the road. I will be following your post. Thanks
Compression test as soon as my tester arrives...
And yep, I think I will swap the injector just to be sure, I know I am being to hopeful
Lead Driver
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From: So. Jersey
Yep, read that thread, what is different is mine is NOT running well, it is running very rough, and I would almost call the noise out of the intake a backfire, more than a Woof... yet almost no air leaks out when I put shop air in the cylinders
Compression test as soon as my tester arrives...
And yep, I think I will swap the injector just to be sure, I know I am being to hopeful
Compression test as soon as my tester arrives...
And yep, I think I will swap the injector just to be sure, I know I am being to hopeful
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From: Agawam MA
I guess if you read the other link for the post then you know where I'm going with diagnosis. If the injector isn't faulty, any other diagnosis will result in pulling the head. One thing you got goin for you is you have it isolated not only to what bank, but also #2 cylinder. You're aheead of the game, sorta!
It would certainly explain why I am not getting air leaking when the valves are all closed... should show up in a compression test though right?
My compression tester just arrived, will have new news tomorrow!
Methanoholic
Joined: Mar 2009
Posts: 6,442
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From: Maine (NorCal Native)
If you have a head gasket failure between 2&4, when you applied air to 2 you would of heard it in 4 ...
When you pressurized the cylinders, did they more or less build pressure ???
If you had all the GP's out and the truck in neutral or park, it should have turned the motor over (unless by the unlikely chance the cylinder was perfectly at TDC or BDC) ... That was not mentioned as to happening, so you either don't have enough air pressure or you have major leaks, if you have major leaks you'll hear them someplace.
Can't wait to see the compression numbers ...
-Enjoy
fh : )_~
When you pressurized the cylinders, did they more or less build pressure ???
If you had all the GP's out and the truck in neutral or park, it should have turned the motor over (unless by the unlikely chance the cylinder was perfectly at TDC or BDC) ... That was not mentioned as to happening, so you either don't have enough air pressure or you have major leaks, if you have major leaks you'll hear them someplace.
Can't wait to see the compression numbers ...
-Enjoy
fh : )_~
Thread Starter
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Senior User
Joined: Aug 2010
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From: Agawam MA
If you have a head gasket failure between 2&4, when you applied air to 2 you would of heard it in 4 ...
When you pressurized the cylinders, did they more or less build pressure ???
If you had all the GP's out and the truck in neutral or park, it should have turned the motor over (unless by the unlikely chance the cylinder was perfectly at TDC or BDC) ... That was not mentioned as to happening, so you either don't have enough air pressure or you have major leaks, if you have major leaks you'll hear them someplace.
Can't wait to see the compression numbers ...
-Enjoy
fh : )_~
When you pressurized the cylinders, did they more or less build pressure ???
If you had all the GP's out and the truck in neutral or park, it should have turned the motor over (unless by the unlikely chance the cylinder was perfectly at TDC or BDC) ... That was not mentioned as to happening, so you either don't have enough air pressure or you have major leaks, if you have major leaks you'll hear them someplace.
Can't wait to see the compression numbers ...
-Enjoy
fh : )_~
Oh, and yes, the motor did rotate some when I pressurized the cylinders
Comp test results tomorrow...