2 Questions - Power Boost Valve and Crankcase Vent!!

by **Paladin06Greg** » Sat Sep 11, 2004 8:53 am

OK, two questions.

1. There is the 3/8 diameter rubber that runs from your power brake boost to back behind the throttle body. About cent way of the line there is a white plastic valve. It looks like a china hat (NO HARM INTENDED) in the middle. It is marked with an "E" and an arrow. My question is which does the arrow face? Towards the engine or the boost Unit?

2. I seem to be getting a considerable amout of air and oil from my crankcase vent line. So much that it clogged my MAF and the car stalled and would start but not run. Thank goodness I had a spare MAF. OK, what is causing considerable amount of air followed by oil to vent through this line?

OH ****. Been doing a little research and #2 could mean "piston ring failure" Got ****!!! Can this be true. My motors only got 26000 miles on it!!

Please respond.

by **SC V6** » Sat Sep 11, 2004 12:40 pm

the oil and air coming out the valve cover is blow by.. caused by piston rings/blown pistons... you either A) cracked ring lands or B) the rings arn't seated.. what rings did you use? Total Seal piston rings can handle lots of boost.. it all depends... the blow by is a BAD BAD BAD sign... I would have a leak down test done immediatly..

sorry to hear the bad news

by **Paladin06Greg** » Sat Sep 11, 2004 1:03 pm

Yep, I was hoping for better news but expected the worst.

Thx

by **Paladin06Greg** » Sat Sep 11, 2004 1:09 pm

For those us over 40 a "I would have a leak down test done immediatly", is a cylinder compression leak test correct?

The rings are factory with 26000 miles on them and yes I run 6PSI boost.

SC V6 wrote:the oil and air coming out the valve cover is blow by.. caused by piston rings/blown pistons... you either A) cracked ring lands or B) the rings arn't seated.. what rings did you use? Total Seal piston rings can handle lots of boost.. it all depends... the blow by is a BAD BAD BAD sign... I would have a leak down test done immediatly..

sorry to hear the bad news

by **SC V6** » Sat Sep 11, 2004 3:09 pm

the rings probably went bye bye... the leak down test is a compression test.. if the rings are failing.. they could possibly be scratching the cylinder walls.. which means new short block depending on the severity of the scratches and how much they can still bore it out

by **Paladin06Greg** » Sat Sep 11, 2004 3:26 pm

Hey thanks. I think I'll just garage it for awhile..

SC V6 wrote:the rings probably went bye bye... the leak down test is a compression test.. if the rings are failing.. they could possibly be scratching the cylinder walls.. which means new short block depending on the severity of the scratches and how much they can still bore it out

by **Paladin06Greg** » Sat Sep 11, 2004 6:52 pm

OK, any other possibilities other then rings? :cry:

I mean the tail pipe is clean. No smoke at all. Could something be plugged up? I recently repplaced all the vacumn hoses under my hood. Any chance that might be an issue?

Waiting to hear from you..

by **SC V6** » Sat Sep 11, 2004 6:59 pm

if you are getting blow by w\ oil in it.. as far as I know its either the rings or the pistons... it could possibly be scratches in the cylinder wall to the point where oil is leaking past.... Start the car and take the hose from the valve cover and unplug it from the intake.. is it a white smoke? does it smell funny??? the tail pipe maybe clean... but you could be clogging your cat also... check and see what the smoke color is from the valve cover

by **Paladin06Greg** » Sat Sep 11, 2004 7:03 pm

I've done what you suggested and it really doesn't have a color but it does smell like oil..

SC V6 wrote:if you are getting blow by w\ oil in it.. as far as I know its either the rings or the pistons... it could possibly be scratches in the cylinder wall to the point where oil is leaking past.... Start the car and take the hose from the valve cover and unplug it from the intake.. is it a white smoke? does it smell funny??? the tail pipe maybe clean... but you could be clogging your cat also... check and see what the smoke color is from the valve cover

by **JoeB** » Sun Sep 12, 2004 5:13 am

Greg, I can't see the picture of your engine that well but a little oil can come through that fat vacuum line that comes from the valve cover to the intake tube. When people buy a custom intake, they usually come with short lines that will sit too level or flat. Get a longer vacuum line that will sag down 6" or so. The oil that blows in there should get sucked back out. Many people have had that problem and you get oil in the intake tube which eventualy will contaminate the MAF. Another solution is an oil catch can but not necessary IMO. I wouldn't suspect your rings yet, not with the quality of this engine. -JoeB

by **Paladin06Greg** » Sun Sep 12, 2004 5:27 am

Hey JoeB,

Man it's not a little oil anymore. I did get the longer hose before when we discussed this issue. But with yesterdays turn of events there is much more oil and the gas coming through the hose has considerable pressure.

Also, when I remove the oil filler cap with the engine running I have pulsating air pressure coming out of the opening. Does that tell you anything? :cry:

JoeB wrote:Greg, I can't see the picture of your engine that well but a little oil can come through that fat vacuum line that comes from the valve cover to the intake tube. When people buy a custom intake, they usually come with short lines that will sit too level or flat. Get a longer vacuum line that will sag down 6" or so. The oil that blows in there should get sucked back out. Many people have had that problem and you get oil in the intake tube which eventualy will contaminate the MAF. Another solution is an oil catch can but not necessary IMO. I wouldn't suspect your rings yet, not with the quality of this engine. -JoeB

by **SC V6** » Sun Sep 12, 2004 7:33 am

Yes, your engine has "blow by" written all over it.. the valve cover hose is suppost to have a slight suction to it... when I had those symptoms I had it checked and had to have a new engine... you may want to check but I had an oil gas mix in my intake, it was like a white/greyish color and was slimy.. the valve cover hose is pushing air out period, which is a sign of blow by... and if it wasn't like that before, and now is.. there is a problem... I would have it checked out by a tech immediatly... have them do a compression test

by **JoeB** » Mon Sep 13, 2004 5:17 am

Very sorry to hear that Greg and with such low mileage. Let us know what they find but I think Scott is right on. -JoeB

by **SC V6** » Mon Sep 13, 2004 1:12 pm

im curious.. how are things going? whats the prob?

by **Paladin06Greg** » Mon Sep 13, 2004 1:32 pm

I haven't had the opportunity to have the problem assessed. The local shops were mostly closed on Sunday and of course today I had to work. I'll post the diagnose when I have something to report.

2 Questions - Power Boost Valve and Crankcase Vent!!

2 Questions - Power Boost Valve and Crankcase Vent!!

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