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post #1 of 19 (permalink) Old 04-06-2019, 10:09 AM Thread Starter
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PCV System Smoke

Hello,

I’m trying to diagnose something weird on my truck. It keeps throwing out smoke from the passenger valve cover or Bank 1 I should say. Smoke like, dissipating smoke as if I threw water on it and it evaporated. This is a huge problem because I’m having the smoke come in the cab when the hood is closed, and then at stops it smokes out the hood on the passenger side when the radiator fans are on, and I can see it coming through the dash if my radiator fans aren’t on.

Let me give some specs that can have relation to my issue. JLP shortblock, runs like a champ, cams have been degreed, no overheating issues. It actually runs pretty cool. 170-180.
Electric fans, EGR delete, PCV, turkey pan vac fitting delete. Vacuum block that I routed, I attached a quick diagram of my current set up.
Currently I have the driver valve cover breathing to intake elbow, and passenger valve cover has a Cobra PCV valve to intake plenum nipple by the rear of the IAC.

Is this PCV related? I’m thinking of doing breathers in both valve covers.

What I have done, tested compression results came out great 160 every cylinder. I did leak down tests as well due to chasing another issue but it came out great as well. 5% leakage all around.
Plugs are burning good too. I will be doing a smoke test on the valve cover here soon and update as well, going to test a few other things too. Thanks for input guys.
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File Type: jpg D1542CB1-8721-4959-BB8D-7FE4E8EB87F6.jpg (160.8 KB, 99 views)

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post #2 of 19 (permalink) Old 04-06-2019, 11:23 AM
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Mine does the smoke thing from the valve cover breathers. But my block is fried. I swapped the rings out last winter and Iím still down 25% compression on multiple cylinders based on the leak down test I did. It also blows an unreasonable amount of smoke at WOT from the exhaust. Overall it runs really well. Itís just tired and ready for a new build.
Iím sure your rings and block are ok I just wanted to share since I also have smoke coming from my breathers.
Here are a few diagrams PCV related you or someone might fine helpful
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File Type: jpeg 7DC8F1AF-19D7-4C88-AD66-CB6F43415B19.jpeg (155.8 KB, 88 views)
File Type: jpeg 59B9A501-95A1-4E29-A064-B536C18DFD32.jpeg (168.0 KB, 89 views)
File Type: jpeg 96DBABF4-846E-4B65-B42D-81874A501B5A.jpeg (178.9 KB, 89 views)

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post #3 of 19 (permalink) Old 04-06-2019, 12:09 PM Thread Starter
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@Leeproctor83 thank you. I have seen your posts on build body and paint. Wow! I need to learn from you, I have so many questions lol I will be posting there soon for something else lol

I have seen those diagrams already but I’m not sure why I am getting this smoke.

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post #4 of 19 (permalink) Old 04-06-2019, 12:16 PM
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Originally Posted by Jeffv333 View Post
@Leeproctor83 thank you. I have seen your posts on build body and paint. Wow! I need to learn from you, I have so many questions lol I will be posting there soon for something else lol

I have seen those diagrams already but Iím not sure why I am getting this smoke.
How much smoke is it? A video?
I would bet nearly all of us here could warm our trucks up to operating temp and remove the oil cap and have at least some smoke.
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post #5 of 19 (permalink) Old 04-06-2019, 02:11 PM Thread Starter
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I haven’t gotten a chance to video the smoke. But even if I could I don’t think I could catch it in video.

I did smoke test just now though, no leaks I plugged the boot at the intake plenum. I pulled the boot off the plenum and plugged it, the hose that goes to the passenger side and PCV valve.

I also pulled the hose from the intake elbow. This one goes to the driver side valve cover, plugged it at the elbow side.

I smoked the whole thing through, and I could see smoke coming out of the intake. Which is odd because I couldn’t see it coming out of the plenum nipple I left open.

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post #6 of 19 (permalink) Old 04-06-2019, 10:46 PM Thread Starter
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@leeproctor83 I have came to a conclusion I am slightly overheating. I noticed the smoke appears when it’s super hot in the engine bay. I am running electric fans and due to my charging issues I have turned one off, and hitting 203 degrees at long stoplights during idle. Here is a video of me trying to mimic the issue, not much luck but you can see the smoke in the beginning. I’m sure I won’t have problems soon as I get my charging system fixed.


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post #7 of 19 (permalink) Old 04-06-2019, 11:10 PM
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If you notice the issue in cab and the fans aren’t on it makes sense you may be overheating. Mabe a fracture in the heater core somewhere? What is your coolant temp when the issue happens ?

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post #8 of 19 (permalink) Old 04-06-2019, 11:18 PM Thread Starter
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Coolant temp at 203 the highest I’ve seen it. Goes down to 180 after the fans turn on.
It’s definitely smoke from the engine bay.

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post #9 of 19 (permalink) Old 04-08-2019, 09:30 PM
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Do you think it might be an oil leak from maybe.... the valve covers? Also are there any restrictions in the exhaust say like clogged cats?

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post #10 of 19 (permalink) Old 04-08-2019, 09:58 PM Thread Starter
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Do you think it might be an oil leak from maybe.... the valve covers? Also are there any restrictions in the exhaust say like clogged cats?

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I smoke tested the valve cover, I didnít see any smoke coming out.

Also, the truck has no cats. So no restriction in the exhaust system.

I think Iím overheating slightly due to some charging issues and electric fans, and this is causing it to ďheat soakĒ and once it cools it lets smoke out.

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post #11 of 19 (permalink) Old 04-08-2019, 10:05 PM
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My cousins lightning smokes a lot more than this... We always have tried to track it down and we came to a conclusion it must be something with his valve guides in his stage 3 Patriot heads.. those are notorious for being shitty heads lol his engine is strong tho and he's installed a catch can in order to divert the smoke back into the intake.

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post #12 of 19 (permalink) Old 04-08-2019, 10:20 PM Thread Starter
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Yeah, it’s probably the valve guides. I’ve has issues with them before. It’s why I took the block apart the first time. Valve guides were leaking bad. I guess I’m bound to find out over time, they should get worst. Lol

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post #13 of 19 (permalink) Old 04-08-2019, 11:08 PM
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Quote:
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Yeah, it’s probably the valve guides. I’ve has issues with them before. It’s why I took the block apart the first time. Valve guides were leaking bad. I guess I’m bound to find out over time, they should get worst. Lol
Yeah if your truck is running good I wouldn't worry about it ... One less thing to worry about these trucks!

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post #14 of 19 (permalink) Old 04-08-2019, 11:14 PM Thread Starter
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Yeah if your truck is running good I wouldn't worry about it ... One less thing to worry about these trucks!
Thanks for the positivity. I just donít want them to leak so bad it starts to coat the pistons and fouling plugs. It was that bad before.

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post #15 of 19 (permalink) Old 04-08-2019, 11:53 PM
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Quote:
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Quote:
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Yeah if your truck is running good I wouldn't worry about it ... One less thing to worry about these trucks!
Thanks for the positivity. I just don’t want them to leak so bad it starts to coat the pistons and fouling plugs. It was that bad before.
I hear yeah... What really fouls up plugs is E85! But I love that stuff!

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