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Old 12-15-2009, 04:13 PM
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Question Engine blow-by

Okay, so yesterday I was pulling into my driveway when I got a very strong odor of something burning and I lifted the hood with the engine still running and I saw smoke pumping from underneath the intake tubing of the CAI. I looked into it further and I found a disconnected hose. It was the very short hose that runs from the top left engine cover into the bottom of the intake tube closest to the turbo.

Is this tube designed for something like the crankcase ventilator? Whether it is or not, is it normal that there is white/bluish smoke to be coming out of that hose? I know these are high compression engines and the engine has to breathe, but does it sound like I have blowby? Or maybe excessive blowby??????

I reconnected this hose and no more smoke and the truck seems to run fine, and runs strong still. But now I'm worried that there is smoke getting sucked in along with the air from the intake.

Thanks

Last edited by E'sStrokr01; 12-15-2009 at 04:26 PM.
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Old 12-15-2009, 04:36 PM
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eh, it's ok. with it running, take off the oil cap and see how much "wind" you get out of the hole.
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Old 12-15-2009, 04:48 PM
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Quote:
Originally Posted by E'sStrokr01 View Post
But now I'm worried that there is smoke getting sucked in along with the air from the intake.

Thanks
This is one of the reasons to do the CCV mod
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Old 12-15-2009, 04:51 PM
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yea, CCV mod! Get with Raul or NCHornet about one....
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Old 12-15-2009, 04:57 PM
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Or do the DIY style for free if you got a piece of hose laying around.
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Old 12-15-2009, 05:29 PM
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DIY CCV Mod

anyone have a write up on the DIY CCV mod? please tell me
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Old 12-16-2009, 05:18 AM
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I wouldn't do the DIY version, running a hose out the back is messy, stinks, and looks like you are driving a piece of junk. But more on that later. Back to the OP.
Yes, this was part of the CCV system on the 7.3, not a very good design but there is a correct way to do this mod that will not change that flow of air, but keep all those oily vapors out of your intake. I am sure your intake boots look very crappy and may even be leaking oil down into the valley, if it isn't now it will soon be. That is why every PSD, 7.3 TO THE 6.4 should do the CCV mod, but do it correctly. I did mine in 2003 and have never touched my intake boots since. You can see what they look like, I believe I still have pics in my sig. Chuck has seen my engine and can tell you they look like new!! Chuck also runs my CCV mod as do many members on this and other forums. Over 400 sold and on the road. Now let's talk about blowby. All 7.3's have blow by and have quite a bit. I have seen so many replies over the years where a member sees a fine mist coming out of the oil fill tube and people will tell him he needs a new motor!!! Every PSD I have ever seen from brand new to 800k+ miles all have this. I have heard if you can set the cap on top of the oil fill tube and it blows off it is excessive, but I really don't think you can check it this way!! If you are worried have a compression test done, but these engines are made to last a long, long time. As for the correct way to do the CCV Mod here is a link. PM me with any ? you might have.

CCV Mod
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Old 12-16-2009, 06:15 AM
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Good stuff Hornet. Did I read that correctly that all I need to get seperately is the hose? And can you recommend a place to mount the canister and about how much hose I'd need? Thanks
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Old 12-16-2009, 07:17 AM
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Drivers side frame rail as close to the engine as possible. 12-14ft will be more than enough. Get 3/4" with ID of 5/8, step by step instructions will be included with the kit, just make you sure you order for the correct year. I can get one out this afternoon if you place the order early enough, will ship USPS Priority Mail.
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