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"
Posts: 541 | From: Memphis, TN | Member Since: 01/21/06 | IP: (108.209.134.61) |
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
Posts: 5910 | From: central Indiana | Member Since: 08/06/02 | IP: (199.168.78.42) |
turbofonz Member + 255/1000 153/2000 369/2000 490/2000
posted 11/29/19 09:10 PM
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)
Posts: 447 | From: Granby, MA | Member Since: 09/27/06 | IP: (71.80.124.119) |
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"
Posts: 541 | From: Memphis, TN | Member Since: 01/21/06 | IP: (2600:387:2:809::) |
JNR 5 star (English Professor) member Has extensive pop up picture book collection 20/1000
posted 11/30/19 12:08 PM
How well is your PCV system working?
Posts: 9762 | From: ca | Member Since: 04/23/04 | IP: (172.119.78.95) |
turbofonz Member + 255/1000 153/2000 369/2000 490/2000
posted 11/30/19 09:46 PM
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) |
pot It's a twee shaker----choot him choot him 182/1000
posted 11/30/19 10:34 PM
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.
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.
Posts: 1464 | From: ronkonkoma, ny | Member Since: 12/19/12 | IP: (24.189.25.4) |
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posted 11/29/19 08:32 PM 
