pcv valve creating blue smoke?

[lil corb]

hello guys, whenever I go wot at 13lbs I get blue smoke only after letting of throttle and the dipstick will pop out and some oil will come out of CAS. I then reduce lbs to 10 and no smoke will come out and no oil will come out of CAS. I'm thinking too much pressure and a bad PCV would cause some oil to be burned. Question is could a bad PCV valve be causing oil to be burned and coming out after shifting but not at WOT and coming out of the CAS? It never smoked at 13lbs before untill today. Also I have oil coming out of Spark Plug Galley, I'm thinking bad VC gasket and spark plug gasket. Help, the DSM curse is getting to me.

thanks

 

[rs-t eclipse]

any time you have smoke under boost and oil coming out your valve cover. you have one of the 4 things wrong. 1 pcv if your lucky. 2 head gasket if your lucky. i say this because of what the the next 2 are 3. worn rings. 4 cracked pistons. having blue smoke sounds like antifreeze is burning so that would be the head gasket. i would do a compression check. if you find one thats low pure some oil in the spark plug hole. if the comp. goes up its the piston or rings. if its still low its the head gasket.

 

[lil corb]

any time you have smoke under boost and oil coming out your valve cover. you have one of the 4 things wrong. 1 pcv if your lucky. 2 head gasket if your lucky. i say this because of what the the next 2 are 3. worn rings. 4 cracked pistons. having blue smoke sounds like antifreeze is burning so that would be the head gasket. i would do a compression check. if you find one thats low pure some oil in the spark plug hole. if the comp. goes up its the piston or rings. if its still low its the head gasket.

There is no smoke coming out during boosting only when letting go of throttle at 13lbs. At 10lbs nothing happens car is fine no smoke or anything. The car does not over heat at all, and I thought white smoke is burning antifreeze and blue is oil. I will check the compression when I get time.

thanks

 

[johnk]

You can do a boost leak test too. If you get air coming out of the valve cover or the dipstick then you have blowby from the rings or cracked pistons too but I've never heard of that. Do the leak test from the intake pipe not the turbo inlet that will eliminate the turbo bearings as a leak.

 

[rs-t eclipse]

you right blue is oil. but still check the compression. as for it smoking after you get off the gas. could be valve stem seals. does the car smoke when it sits at idle to long? or when you first start it up?

 

[lil corb]

You can do a boost leak test too. If you get air coming out of the valve cover or the dipstick then you have blowby from the rings or cracked pistons too but I've never heard of that.

I think the oil coming from dipstick is from bad PCV, and valve cover is from a bad valve cover gasket which is common. The car pulls hard the last owner put a new cosmetic headgasket, all new bearings, and arp headstuds.

 

[lil corb]

you right blue is oil. but still check the compression. as for it smoking after you get off the gas. could be valve stem seals. does the car smoke when it sits at idle to long? or when you first start it up?

It smokes white from condensation normal, and my friend says when I went WOT no smoke came out but when I put it to neutral a puff of blue smoke came out. And this is only at 13lbs when I put it back to normal or anything under that nothing. For the oil coming out of CAS could it be a bad O-ring, and also some of the hoses leading to the Thermostat start steaming maybe they are going bad or leaking.

thanks

 

[rs-t eclipse]

if you have oil coming out the oil check and the valve cover. you got worn rings or crank pistons pretty sure of this now. do a compression check.

 

[lil corb]

aight, I will compression test it soon.

thanks

 

[lil corb]

compression tested the motor
1st cyl=150psi
2nd cyl=143psi
3rd cyl=138psi
4th cyl=140psi
I put oil in the second cylinder and compression went to 210 psi. Any ideas?

car was not fully warmed up, just about 1/4 warmed up.


EDIT:we didn't do the procedure correctly. We did not hold the gas down or disconnect the fuel and didn't keep it cranking for 4 revs. So we are going to try again and this time get a better result.

 

[Spyderman7]

210 lbs wet with 140 to 150 dry almost sounds like bad rings in a NA motor.Lets see what your new test show.

 

[lil corb]

Yea I'm thinking the same way, the car does not smoked during start up, never during idle, never at wot, just black from running rich, and white from condensation. BTW it's a lot of white smoke and I was thinking maybe HG, but it doesn't smeel sweet just nasty catless smell, the smoke does go away quickly unlike coolant white smoke which stays in the air. oil is fine no milky color, doesn't lose coolant, doesn't overheat and it pulls strong. The only time I saw blue smoke was at 13lbs and when oil came out of the CAS. I read a bad PCV could cause a puff of blue smoke. That is all there was just a puff, and at idle after the puff. But when I started it up again nothing at all. I am going to re test it out asap, I'm thinking since I got pretty much 140psi average in the car now warmed up and not holding WOT maybe normal testing should get me good numbers. Is that possible?

thanks

 

[americanjebus]

sounds to me like blow-by your creating too much preasure in the cylinder and your rings cant support it

 

[lil corb]

sounds to me like blow-by your creating too much preasure in the cylinder and your rings cant support it

So in other words just a bad PCV?

thanks

 

[johnk]

He was saying your piston rings aren't holding the pressure any more, nothing about the PCV valve. The PCV is a cheap fix you can try it.

Check this site out and do a real compression test when you've taken the car for a 10 minute drive. http://www.dsmgrrrl.com/FAQs/compression.htm

The compression should be 164 with a service limit of 121. Also keep in mind that your numbers should all be within 14 psi of each other. If you get similar results to your #1 and #3 you had before, you're close to service time.

 

[lil corb]

We did it again I didn't drive it for ten minutes but just had the car warmed up untill half way mark.

results are

150psi
139psi
140psi
140psi

the PCV valve only blows air one way so I think it's ok still going to replace it. I'm hoping motor will last because I've seen motors with lower compression then those that with bigger turbos still giving good power and reliablity. Just going to do the most I can right now and I guess wait till it gives out on me and rebuild.

thanks for help

 

[Arod]

My car has the exact same conditions as yours, only burns oil/smokes blue when letting off the throttle after boosting, so I took the cold air pressure hose off the turbo and there was oil in it so its got to be a bad turbo. Or at least a bad seal in the turbo. I just talked to a guy and he said to check the drain tube from the turbo to make sure that there is nothing blocking oil from returning into the oil pan.

Have you checked the hose out of the turbo for oil? I haven't put a new or different turbo on to confirm yet but thats got to be what it is.

 

[T2Small]

When you have smoke at idle or coming off boost, in general the problem is the head. When you have smoke under power, in general the problem is the bottom end. This gross oversimplification ignores the turbo completely.

I suspect your valve stem seals. If they are bad, the car will tend to smoke while decelerating or coming back to idle after a hard run.

 

[lil corb]

My car has the exact same conditions as yours, only burns oil/smokes blue when letting off the throttle after boosting, so I took the cold air pressure hose off the turbo and there was oil in it so its got to be a bad turbo. Or at least a bad seal in the turbo. I just talked to a guy and he said to check the drain tube from the turbo to make sure that there is nothing blocking oil from returning into the oil pan.

Have you checked the hose out of the turbo for oil? I haven't put a new or different turbo on to confirm yet but thats got to be what it is.

I never thought of that it could be a bad turbo, I have a FP return line, the old one was leaking.

 

[lil corb]

When you have smoke at idle or coming off boost, in general the problem is the head. When you have smoke under power, in general the problem is the bottom end. This gross oversimplification ignores the turbo completely.

I suspect your valve stem seals. If they are bad, the car will tend to smoke while decelerating or coming back to idle after a hard run.

Exactly my problem only after hard run. I will check valve seals.
thanks