Oil in injector housing?

[mike100]

Originally Posted by zr1don

The pcv system is one the possible causes of high N0x. If it is not working properly or if the system is allowing oil to enter the intake manifold, according to recommended troubleshooting, it can cause high N0x. The catch can I am installing I bought on ebay, if it works and the N0x comes down, I will post results.

did you ever do up a catch-can? I'm about "this close" to buying something and making a double-T hose connection for the PCV's and running though a can (eliminating the hard-pipe). There's a million and one catch-cans on ebay and I was wondering if you did your yet.

[-=Jeff=-]

Originally Posted by tomtom72

You know Jeff, maybe we can do an experiment since we both have 90 heads. I'll install mine they way I did them with the three holes and you do yours the right way and we can compare the volume of oil that ends up in our catch cans. Maybe that will tell us something?


Tom

it might, but the can was not catching everything I don't think.. plenum and IH had more oil then I thought when I pulled it apart..

Searched a bunch of parts stores today, nobody had the 550-011 I needed, so I used the 550-013 and ground them smaller on the grinder.. added the holes and they worked good.. hoping to start the reinstall later tonight.

[zr1don]

My ebay catch can was not removing all the oil coming through the pcv system as evidenced by oil traces in the hose at the connection to the plenum. I bought a water seperator for air compressors from Loews, modified it slightly and it seems to keep all oil out of the plenum. I passed CA emissions testing w/the oil catch system and using thermo wrap on my headers and CATS.

[LGAFF]

If you have the smaller diameter(alittle over an inch) breather holes, O'Reilly and most other stores stock Dorman 555-018.....it is a hair small, however using a 17mm socket you can expand it to a perfect fit by driving the socket into the plug

[zr1don]

For anyone doing a catch can - if the can does not turn the airflow a couple times, plus use a filtering material, it probably won't get all the oil out. On my can the air comes in the side of the can near the top and exits out the other side across from the inlet. Inside, there is a verticle seperator plate from the top of the can to about 1/3 the way to the bottom. This forces the incoming air to turn 90 deg moving down the can and then another 180 deg to exit at the top. I stuff the same filtering material in our cam covers in the exit side of the can to stop any remaining oil from the airflow. So far the the pcv connection entering the intake has been dry, and I find oil the catch can. Especially after a high rpm blast or two ----or three---- or----.

[-=Jeff=-]

I don't expect it to get all the oil out, but some helps

[Paul Workman]

Originally Posted by LGAFF

If you have the smaller diameter(alittle over an inch) breather holes, O'Reilly and most other stores stock Dorman 555-018.....it is a hair small, however using a 17mm socket you can expand it to a perfect fit by driving the socket into the plug

Most of you young whipper-snappers were still squirmin around in chitty diapers when all GM SBC freeze plugs were just a flat disc - just slightly dished. The idea was/is the dished plug fits easily in the hole and would bottom against a little lip that was machined into the hole. The convex side of the plug faced out, and when driven in - thus flattening the disk - the edges expand to tightly seal the hole.

As far as this discussion goes, if there is such a lip in the 90 IH holes, then I'm wondering if the convex Dorman (sp?) plugs might not be thus installed w/o trying to flatten them to fit before installing them? I'm just axin'...

P.

[tomtom72]

On the 91 I/H's that I have as spares there is no lip to stop the plug. You just have to eyeball it as you drive the plug to make sure you don't go too far in and have it fall into the cavity.


I am not sure what there is on a 90 I/H as far as a lip inside the hole. I never tried to pull out the plugs that were there from the factory.


Tom

[-=Jeff=-]

Originally Posted by tomtom72

On the 91 I/H's that I have as spares there is no lip to stop the plug. You just have to eyeball it as you drive the plug to make sure you don't go too far in and have it fall into the cavity.


I am not sure what there is on a 90 I/H as far as a lip inside the hole. I never tried to pull out the plugs that were there from the factory.


Tom

Same here is the 93- later also had no lip but are smaller DIA holes the the 91s of Tomtom's

[Shrek]

I'm currently in the process of removing the secondary vacuum system from my wife's 91. I removed everything yesterday and had a good bit of oil in the IH, PCV lines, and Plenum. I have a catch can from Elite on the way and hope that takes care of the Plenum. I was surprised to see it had IH and Heads as pictured for the 90 MY. My guess is most of the early 91's got 90 parts installed.

Originally Posted by A26B