BAD blow by, please help
Thread Starter
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Senior User
Joined: May 2005
Posts: 416
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From: Federal Way, WA.
BAD blow by, please help
i am having a big blow by problem, its so bad it looks like my bronco is on fire LOL 
i have done some work to the engine, 1404 edlebrock offy intake and EFI manifolds. i cant get this thing tuned right and cant figure out how to at least slow down the blow by.
i have done some work to the engine, 1404 edlebrock offy intake and EFI manifolds. i cant get this thing tuned right and cant figure out how to at least slow down the blow by.
Elder User
Joined: Jan 2005
Posts: 726
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From: Silverdale, WA.
PCV is my best bet, it should attach from the valve cover to the middle port on the front of the carb. You can clean the old one with carb cleaner, or buy a new one for about 3 bux. They should rattle freely when you shake it. Keep us updated...
Thread Starter
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Senior User
Joined: May 2005
Posts: 416
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From: Federal Way, WA.
the PCV is connected to the center port on the carb, and it dose rattle when i shake it. I was planning on going and getting another one just cuz it cant hurt and only cost 3 bucks. It didnt start doing this till yesterday, and it is getting in to the cab 
I know the only way to "fix it" is to rebuild the engine, was just hoping to reduce it so that it wont flow into the cab.
I know the only way to "fix it" is to rebuild the engine, was just hoping to reduce it so that it wont flow into the cab.
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
It could be a busted piston causing the blow by. Is your oil getting milky white from the excess blow by?
Not saying it is but not saying it isn't either.
Not saying it is but not saying it isn't either.
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Postmaster
Joined: Jul 2001
Posts: 4,038
Likes: 3
From: South Kitsap County, WA
First off Mark, let's go back in history before we call this "blow by."
Did the truck smoke before the carb was installed?
Had the truck sat a while between firings? How long?
Give us a color on the smoke... white vs. blue vs. black...
This way we can quit poking around in the dark.
-Kerry
Did the truck smoke before the carb was installed?
Had the truck sat a while between firings? How long?
Give us a color on the smoke... white vs. blue vs. black...
This way we can quit poking around in the dark.
-Kerry
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Thread Starter
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Senior User
Joined: May 2005
Posts: 416
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From: Federal Way, WA.
Originally Posted by kspilkinton
First off Mark, let's go back in history before we call this "blow by."
Did the truck smoke before the carb was installed?
Had the truck sat a while between firings? How long?
Give us a color on the smoke... white vs. blue vs. black...
This way we can quit poking around in the dark.
-Kerry
Did the truck smoke before the carb was installed?
Had the truck sat a while between firings? How long?
Give us a color on the smoke... white vs. blue vs. black...
This way we can quit poking around in the dark.
-Kerry
no it was not sitting long, just over night
and the smoke it white, and coming from the oil breather cap.
I know that the only way to fix the the problem is to do a rebuild and was just hopong to reduce it a bit. i went and got a new breather cap that has a filter on it and that helped a HUGE amount. Now its not coming into the cab any more. Part of the problem was that there was so much blow by that it was getting oil on the under side of the hood and then dripping on the rest of the engine and smoking a bit.
thanks for all your help every one
Postmaster
Joined: Jul 2001
Posts: 4,038
Likes: 3
From: South Kitsap County, WA
You have a lot of blow by... I was thinking you just had the carb out of adjustment... or like Chris said, a PCV valve.
Sounds like a compression check is in order to confim that.
-Kerry
Sounds like a compression check is in order to confim that.
-Kerry
Thread Starter
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Senior User
Joined: May 2005
Posts: 416
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From: Federal Way, WA.
i did do a comp. check at kevins and its getting 18-19 psi solid, not bouncing at all. I think i have dome all i can till i build a motor for it. Cant think of any thing else to do to reduce the blow-by, just have to wait till i have the money to get an engine and start building
Postmaster
Joined: Jul 2001
Posts: 4,038
Likes: 3
From: South Kitsap County, WA
Ummm... compression checks of the cyliners are normally over 100psi... Are you talking fuel pressure? 'Cause that sounds good.
I'd do the cylinders....
Speaking of Kevin, what's he up to? Haven't seen/read him in a few weeks.
-Kerry
I'd do the cylinders....
Speaking of Kevin, what's he up to? Haven't seen/read him in a few weeks.
-Kerry
Cargo Master
Joined: Jun 2003
Posts: 2,982
Likes: 7
From: Somewhere Saskatchewan
Is there suction at the PC valve?
If not there is a plugged port or hose.
You can pressure each cylinder and see where the leak is.
There is an adapter that screws into the spark plug hole and you air it up.
If the rings are leaking air will come out the breather.
If a valve is leaking it will come out either the carb or exhaust.
If not there is a plugged port or hose.
You can pressure each cylinder and see where the leak is.
There is an adapter that screws into the spark plug hole and you air it up.
If the rings are leaking air will come out the breather.
If a valve is leaking it will come out either the carb or exhaust.
Thread Starter
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Senior User
Joined: May 2005
Posts: 416
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From: Federal Way, WA.
Originally Posted by srercrcr
He's talking inches on vacuum on a vacuum gauge I believe.....
I have done a compression check on the cylinders but it was about a month ago so i dont remember the numbers.
kevin is doin good, got hooked on a comp game called world of war craft and has been playing it a lot, me to though, its a very fun game