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Problem with blowby


91vr4
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Galant VR-4 org Post #: 1247806 posted 11/29/19 08:32 PM     Remind Me!  Send Private Message   Edit Post      
I have an issue with blow-by on my vr4. Thing is I don't know where it's coming from. I've secured the dipstick down with a spring. The only other place I can suspect is the oil cap. How likely is that to be the culprit?



as Carrol Shelby once said "a good driver never experiences turbo lag"

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gvr4ever
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Galant VR-4 org Post #: 1247807 posted 11/29/19 08:47 PM     Remind Me!  Send Private Message   Edit Post      
I'd start with a compression test. I've just replaced worn out dipsticks and that's always worked for me, so if a spring isn't holding it down, you might have a bigger problem.

A clogged PVC valve might be causing extra pressure? Maybe...



1992 Nile black w/sunroof
15xK miles. 2nd owner since 1998

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turbofonz
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Galant VR-4 org Post #: 1247808 posted 11/29/19 09:10 PM     Remind Me!  Send Private Message   Edit Post      
Check PCV.

What's making you think there is so much blowby? The dipstick "seal" hardens up and can blow out on a normal healthy motor. Feel the rubber part at the top, it likely is dry and doesn't feel like rubber. That is what makes them pop out. I personally prefer 2g dipsticks anyways (different style)

Also, the oil cap gasket also has the same issue, and dries out and leaks, even on a healthy motor. A new gasket is like $2.



Ryan W.
91 TSi AWD - 9 sec stock bottom end and corn fed
91 Galant VR-4 - Summit White - 153/2000
91 Galant VR-4 - Summit White - 490/2000
91 Galant VR-4 - Nile Black - 369/2000
92 Galant VR-4 - Summit White - 255/1000 - [email protected] - sold


Edited by turbofonz (11/29/19 09:11 PM)

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91vr4
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Galant VR-4 org Post #: 1247809 posted 11/29/19 11:42 PM     Remind Me!  Send Private Message   Edit Post      
Guess I need to check all 3.
But the reason I say I have blow-by is because anything over 15lbs and the spark plug valley has a good bit of oil in it. And based by the splatter on the underside of the hood, it's coming from the driver side. Hard to distinguish between the dipstick and the cap though. Might still be the dipstick.



as Carrol Shelby once said "a good driver never experiences turbo lag"

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JNR
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Galant VR-4 org Post #: 1247811 posted 11/30/19 12:08 PM     Remind Me!  Send Private Message   Edit Post      
How well is your PCV system working?

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turbofonz
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Galant VR-4 org Post #: 1247814 posted 11/30/19 09:46 PM     Remind Me!  Send Private Message   Edit Post      
Start with cap gasket for sure



Ryan W.
91 TSi AWD - 9 sec stock bottom end and corn fed
91 Galant VR-4 - Summit White - 153/2000
91 Galant VR-4 - Summit White - 490/2000
91 Galant VR-4 - Nile Black - 369/2000
92 Galant VR-4 - Summit White - 255/1000 - [email protected] - sold

Posts: 447 | From: Granby, MA | Member Since: 09/27/06 | IP: (71.80.124.119) | Report this post to a Moderator

pot Galant VR4.org Moderator
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Galant VR-4 org Post #: 1247815 posted 11/30/19 10:34 PM     Remind Me!  Send Private Message   Edit Post      
In addition to what everyone has said what about the Valve Cover Gasket, more specifically the four circular gaskets for each Spark Plug well?

You mentioned the Spark Plug “Valley” has a bit of oil so I would start with the Valve Cover Gasket.



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gvr4ever
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Galant VR-4 org Post #: 1247817 posted 12/01/19 07:37 AM     Remind Me!  Send Private Message   Edit Post      
Felpro kit comes with everything needed. At least what I've been ordering from rock auto.

Half moon piece, valve cover gasket, spark plug gaskets.

Just be sure to clean everything. If you don't remove everything old, it won't seal.

I still use a little gasket maker too. helps hold the gasket in place and it's needed for the half moon piece anyway.

Let cure over night. If you do it right, it will last years. If you rush it, it won't.



1992 Nile black w/sunroof
15xK miles. 2nd owner since 1998

Posts: 5910 | From: central Indiana | Member Since: 08/06/02 | IP: (199.168.78.42) | Report this post to a Moderator

tektic
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Galant VR-4 org Post #: 1247824 posted 12/02/19 09:28 AM     Remind Me!  Send Private Message   Edit Post   
I've never had any luck with the stock size PVC system. Everyone upgrades the line size for a reason.

In my case I drill and tap the valve covers with 1/4" npt fittings, drill out the inside of 14mm barb to 1/4"brass fittings and sweat in a piece of copper tube with some holes drills in it. I polish the area under the VC baffle. I then drill and tap the intake manifold for a 1/4nptx14mm fitting. Intake tube gets the same fitting. Its a bit of effort but keeps everything working better, doesn't require welding and I'm not a huge fan of the an fitting look.

The only leak I had to deal with was the cas o ring, but they just fail after a while. Took care of that recently.
This has worked well to improve the overall efficiency of the system.

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