What's new
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

Smoking - What do you think

AZ79K5Project

AZ79K5Project

1 ton status
 Premium
Joined
Jan 15, 2006
Posts
2,216
Reaction score
120
Location
Arizona
Here's the lowdown - I replaced my valve covers and my stock intake with an Edelbrock a few weeks back. It was smoking on and off after I bolted it back together. Finally discovered that oil was being pulled through the PCV. Replaced the valve covers with ones with appropriate baffles - no more oil issues.

Jump ahead - It pulled over a quart of oil through the PCV on an outing before Christmas, before I discovered what the source was. Enough oil that it fouled spark plug #7.

I started it up today:

[youtube]ftTaoEL-bCQ[/youtube]

I drove it about 8 to 10 miles. Most of the smoke cleared.

Here's the result:


To my questions:
Could the smoking be residual oil from all the oil being sucked into the intake through the PCV or should I be looking for another source?

Are you hearing a miss in the audio? I am running true dual exhaust and I can't tell.

Does it sound like the timing is too advanced? I didn't hear anything while driving, but I think I am hearing an engine knock in the audio.
 
Last edited by a moderator:
We have an 84 K5 and a 83 C20,also owned several 80ies K20s all with over 100K miles,all smoke like your rig,the blazer is just about the same as vid #2 you show upon startup, and remains for several minutes till it burns all the oil from the cylinders. I pretty much attribute this to bad valve guide seals and a good old worn out engine. The Blazer bruns a quart every 300 miles probably,a friends a quart every tankful,been like that for years and some 50K miles.
 
This is all new since the new intake/valve covers. I'm thinking valve guides may be adding to some of the smoke.
 
Valve stem seals are easy to replace. Some nylon rope and seals and in less than 2 hrs you could eliminate that problem.
Tarey
 
So you replaced your manifold too?

I just had MAJOR problems sealing my manifold. And it looked EXACTLY like yours.

Yeah, the block was decked a little, but it was even. Turned out I was using an intake gasket I shouldn't have. Not suppoed to use the felpro permaseals on the edelbrock intakes. Too hard or something. I switched to the extra thick .120" felpro gaskets and ALL the smoke is gone. Idles smoother, lower temps, better throttle response, better response to carb tuning, less smell, can add more advance without pinging, etc.
 
fried_guy said:
So you replaced your manifold too?

I just had MAJOR problems sealing my manifold. And it looked EXACTLY like yours.

Yeah, the block was decked a little, but it was even. Turned out I was using an intake gasket I shouldn't have. Not suppoed to use the felpro permaseals on the edelbrock intakes. Too hard or something. I switched to the extra thick .120" felpro gaskets and ALL the smoke is gone. Idles smoother, lower temps, better throttle response, better response to carb tuning, less smell, can add more advance without pinging, etc.
Click to expand...

Were you getting a coolant leak? I started with the Felpro's and switched them to Mr. Gasket's 5820 - 0.125".

I'm not loosing any coolant or having any overheating problems. I believe it's 100% oil. :confused:

Never attempted valve seals. I never attempted an intake until I switched to this one out.

 
I would take your truck out and run it good. If you pulled a quart thru the intake there is a good chance there is some pooled up in there causing the smoke. Do a few full throttle runs if possible to clean everything out.
Did you replace or clean the pvc valve?
 
If this vehicle has a catalytic convertor and burned that much oil it is probably just the oil still burning. Burning that much oil will Kill a cat in short order also.
 
Thunder said:
I would take your truck out and run it good. If you pulled a quart thru the intake there is a good chance there is some pooled up in there causing the smoke. Do a few full throttle runs if possible to clean everything out.
Did you replace or clean the pvc valve?
Click to expand...

Cleaned it out. It is still functioning fine. I ran it up and down a two mile stretch four or five times. It cleaned a lot of it out.

I'm hoping that it's just residual oil going through and not valve guides.

4X4HIGH said:
If this vehicle has a catalytic converter and burned that much oil it is probably just the oil still burning. Burning that much oil will Kill a cat in short order also.
Click to expand...

I didn't even think about that. It pulled a LOT of oil before I discovered the initial source.

Cats were replaced three years ago.:doah:

Anyway of cleaning the intake without damaging anything else? Just let it burn?
 
If it's just oil still in the cat there is nothing you can do but let it burn itself away. Keep in mind that it may have already ruined the cat and you'll know if it becomes really sluggish and doesn't want to accelerate very easy.
 
It pulled some coolant, not much though. Mostly just oil. When I removed the gaskets they were both wet and oily on both sides all over.
 
the lifter valley... looked like on all 8 cylinders too. switched the gasket and solved all my problems.
 
I've been driving it to work for the last couple of days and on a couple of errands. I've put about 50 to 60 miles on it. I'll check my oil level again in the morning to make sure that it's not dropping.

This is what's happening now:
No smoke on cold start.
Very little to no smoke while driving.
The smoke begins at operating temperature when I take off from a stop after idling at a red light.
The amount of smoke is decreasing.

I'm seems to me that it is just the residual from the PCV problem.

Sound reasonable or should I be checking for something else?
 
You must log in or register to reply here.

Latest Posts

Top Bottom