|11-13-2011 09:36 PM|
|aford89||we replaced everything except the block itself, used the old head but had it dipped and milled and everything that attatches to it is brand new|
|11-12-2011 12:37 PM|
I have an 90 4.2 mine does the same thing your is doing, plus it will blow oil out the dipstick under heavy load or high RPMs, like 65 MPH.
I have low compression, bad rings from PO running it hot!
I don't know what you mean by rebuilt eng. new rings and all.
It is impossible to "rebuild an eng." with out new rings. REBUILDING an engine is to renew all the surfaces and replace all the rings, bearings gaskets, seals, freeze plugs, cam or regrind the cam, every thing in the engine. If someone just put a new set of rings and bearing in an old engine that' not a rebuild, it's a ring job, and you can still have blow by if the cylinders are worn.
Have compression check done to see what you are working with. Good Luck!
|11-12-2011 09:56 AM|
|11-12-2011 05:54 AM|
|90YJinPC||had the same problem myself, it was just like jk'n said, the line between the pcv and carb was clogged @ the inline orifice.|
|11-12-2011 12:23 AM|
|aford89||Thanks i have the 4.2 so im finding very different pictures and routes is the PCV valve line supposed to tie into the front at the base of the carb? Its the stock carb that came with the 4.2|
|11-11-2011 11:44 PM|
Here is the definitive information on the CCV system for the 2.5 and the 4.0:
|11-11-2011 11:18 PM|
|aford89||Thanks i will have to look tomorrow and see if thats it, so the front plug hose goes to the manifold and not the bottom of the carb?|
|11-11-2011 10:54 PM|
|11-11-2011 09:53 PM|
|aford89||i tried searching posts and all i found was bad PCV valves and i know mines good....|
|11-11-2011 09:35 PM|
|jk'n||There is a post on here about this. It has to do with a small orifice and I'm thinking it is right in the elbow where it attaches to the valve cover or where it attaches to the intake manifold that gets clogged. pull it, clean it and put it back together. Problem should be gone.|
|11-11-2011 09:11 PM|
|aford89||it blows oil out of the rear "breather" only when under a load the other times its just the gases, they are new hoses all the way around, and we cleaned the valve cover before we put it all back together, dont know where else it would be clogged....|
|11-11-2011 08:24 PM|
|kik||On the 4.2 you have one PCV at the front of the valve cover as you know and good that it's working. The breather at the rear just vents into the air cleaner through an "element" within a plastic housing that's clipped to the air cleaner. I'm not sure that I understand your question, but if you don't have one they're available. Or, you can disconnect it and let it vent outside of the air cleaner, pre 1968 vehicles. If you're saying that your 4.2 is blowing a lot of oil through it into the air cleaner then you have an internal engine problem, probably clogged ports.|
|11-11-2011 07:22 PM|
What is everyone doing with their PCV valve that goes into the breather? on a 4.2. We have one that the valve is working fine but under a load the breather will get full of oil coming out of the exiting hose. The motor just got rebuilt (new rings and all)