Smoking

[Anonymous]

The other day i was driving to work. and i noticed a little smoke every now and then coming through my firewall.

When i left work i got on the free way. it started to smoke really bad, every time i accelerated.
When i got home i popped the hood to check everything out.
everything looks fine. but its smoking out my oil breather. Its a white/bluish smoke


From what i gathered on here. I figure it could be my rings. but i just thought i'de ask.


Does anyone know what this could be?


It's a 200 out of a 64 mustang with about 60k on a rebuild

 

[l3n]

That sounds like blowby to me...

Could a clogged or stuck PCV do something like that too?

 

[BUZZ]

I agree its probably a stuck pvc valve or less likely a exhaust leak.

 

[CobraSix]

Change the PCV and check your PCV hose connections. Start there and see what happens.

Rings don't usually all of a sudden fail, plus for you to see it in the engine bay, you'd have to have one hell of an exhaust leak or extremely worn out valves and guides, all of which would be very obvious to you if you had them.

 

[Anonymous]

The pcv is fine.

When i pull it out and revv it up. it smokes like a train. and at high rpms there's a slight knocking sound.


I'm stumped on this one

 

[l3n]

...uh oh.

What kind of knocking sound are we talking about here?

 

[BUZZ]

Now your startin' to sound like you have a cracked ring or worse. Have you been putting you foot in to it lately? After thinkin a bit is the smoke from the tail pipe or is it coming off the motor. If you park it and come back the next morning and it smokes on startup but goes away after a bit that says you need your head rebuilt, but if it smokes all the time its your rings. Can you run a compression and vac test? That might tell us if you have a burnt valve.

 

[Anonymous]

Like i said. Its smoking out the top of my oil breather. Is you take the cap off it looks like an old train with a huge trail of smoke behind it.
I dont have a compression tester. ill try and pick one up today.

when im standing in front of my car and i revv the engine up a bit there is a slight knocking sound. i dont really know what it is.
It sounds like the rocker arms are loose or somthing. but i checked them and they are good.

 

[Bort62]

Like i said. Its smoking out the top of my oil breather. Is you take the cap off it looks like an old train with a huge trail of smoke behind it.
I dont have a compression tester. ill try and pick one up today.

when im standing in front of my car and i revv the engine up a bit there is a slight knocking sound. i dont really know what it is.
It sounds like the rocker arms are loose or somthing. but i checked them and they are good.

If you have smoke coming out of the VC, then you have blowby.

if it's really bad, it could be a lot of things. Even a hole in a piston.

Time for a compression check...

 

[l3n]

Hmmmm....


Try pulling the valve cover and revving the car again to confirm whether or not it's the rockers. If it is, it's probably a minor problem.


If it's not, you might try pulling one plug wire at a time and revving the engine again.

 

[Anonymous]

What am i looking for when pulling one wire at a time?

 

[BUZZ]

The knock will go away. It normally means you have a rod knock

 

[Bort62]

The knock will go away. It normally means you have a rod knock

I'm not sure why pulling plug wires would affect rod knock... the piston is still accelerating up and down the bore and slapping the rod end around...

I'm also not sure why people are so hesitant to do a compression check. Instead, they resort to all these weird home remedies to try and figure out what's wrong.

If you suspect compression, then TEST COMPRESSION. Then you don't have to guess... Save the guessing for the stuff that you can't test directly.

 

[l3n]

Without combustion, the piston isn't going to move with the same force.

He doesn't have a compression tester. Yes, it's a good idea, but I'm working with the tools at hand

 

[BUZZ]

Yes, piston still goes up and down but it's not slammed down by the force of combustion. So by pulling the wire in most cases the knock will go away telling you which rod to check. It's alot nicer knowing to go straight to a certain rod that it is to lay on your back with oil in your face while checking all of them.

 

[Bort62]

Yes, piston still goes up and down but it's not slammed down by the force of combustion. So by pulling the wire in most cases the knock will go away telling you which rod to check. It's alot nicer knowing to go straight to a certain rod that it is to lay on your back with oil in your face while checking all of them.

There's not a whole lot to check. Every knocking rod I've delt with has been painfully obvious.

Who doesn't have a compression tester? they cost 20 bucks!

http://store.summitracing.com/partdetai ... toview=sku

 

[BUZZ]

I don't know Bort everybody's got their own way of doing stuff you know? I used to have to work on a bunch of old farm trucks, and all I can say is when someone comes in from the back 40 and tells you they got a truck stuck and it won't run anymore. You know you got some problems, but any how thats where I learned alot about workin with what yah got. I couldn't carry every tool I had, and most of the time I had to work on them where they where.

 

[Bort62]

I don't know Bort everybody's got their own way of doing stuff you know? I used to have to work on a bunch of old farm trucks, and all I can say is when someone comes in from the back 40 and tells you they got a truck stuck and it won't run anymore. You know you got some problems, but any how thats where I learned alot about workin with what yah got. I couldn't carry every tool I had, and most of the time I had to work on them where they where.

I hear ya, and that's a valuable skill to have when you are broken down in a parking lot somewhere.

But when you are at home, in your garage, trying to permanantly solve a problem (not just get home) it's a different ballgame.

 

[Anonymous]

I had a compression tester. but i recently got into a hassel with my roommates ex husband who is a drug addict and desiced to rob me shop and dissappear.

so i am now limited on my tools.

Thanks for all the information and help you guys are giving me.

 

[BUZZ]

Sorry about the tools. Thats alot of money