MJ Comanche Tech. Stock & Modified. MJ (86-92)
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2.5l Question

Old 03-04-2015, 09:46 AM
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Long story short. Bought a 86 2.5l 4 speed. It's a Comanche. Was told it would crank but not fire. So I replaced the CPS. Changed the firing order. It ran. But has massive oil coming into the airbox. I pulled the valve cover. Cleaned the cover inside and out. As well as the 2 bushings up top. Plan on redoing the entire pcv/ccv (whichever this has) and wondering why it looks like no oil has been getting up top to the valves?

2.5l Question-image-2038834231.jpg

Last edited by Outlaw Star; 03-04-2015 at 07:20 PM.
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Old 03-04-2015, 07:22 PM
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Take the pushrods out and make sure they are clean inside. Also inspect the lifters because they "pump" oil through the pushrods. Also have you checked the oil pressure?
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Old 03-04-2015, 08:45 PM
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Check oil, and pressure, you can start it without the valve cover and check to see if oil is sraying out of the pushrods/rocker arm holes, could just look like that from sitting, most of the oil sprays onto the top of the valve cover than drips down.
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Old 03-04-2015, 09:03 PM
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I haven't really tested much. It's in a portable garage. And the oil that comes out. Hits the inner fender then drops on the exhaust so makes a giant smoke house.
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Old 03-05-2015, 06:43 AM
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Originally Posted by JeepStephie99 View Post
I haven't really tested much. It's in a portable garage. And the oil that comes out. Hits the inner fender then drops on the exhaust so makes a giant smoke house.
Seeing as we have Chevy style rocker arms, I can suggest a tool/clip that allows you to run without a valve cover to inspect the valvetrain. But then again by "shooting out" are we talking small spritz or actual gushing out? Because if its gushing out, we got a problem.
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Old 03-05-2015, 06:46 AM
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Originally Posted by Outlaw Star View Post
Seeing as we have Chevy style rocker arms, I can suggest a tool/clip that allows you to run without a valve cover to inspect the valvetrain. But then again by "shooting out" are we talking small spritz or actual gushing out? Because if its gushing out, we got a problem.
It's literally flowing out the airbox at a rapid rate. They claimed it ran fine before. Ive seen videos from like 2 months prior. But you never know lol.
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Old 03-05-2015, 07:24 AM
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Originally Posted by JeepStephie99 View Post

It's literally flowing out the airbox at a rapid rate. They claimed it ran fine before. Ive seen videos from like 2 months prior. But you never know lol.
If its "flowing" out of the air box you have a problem. You need to find out exatly were its coming from, (probly one of the ccv hoses) remove the airbox and hoses and start it, its hard to believe that much oil would be coming from the intake...
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Old 03-05-2015, 09:07 AM
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Originally Posted by Gmaster View Post

If its "flowing" out of the air box you have a problem. You need to find out exatly were its coming from, (probly one of the ccv hoses) remove the airbox and hoses and start it, its hard to believe that much oil would be coming from the intake...
X2 on this.
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Old 03-05-2015, 12:30 PM
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Old 03-05-2015, 12:30 PM
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This was how I found out

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Old 03-05-2015, 12:33 PM
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Ok, that's way to excessive on the blow by. Let's start with a few basics. 1) check routing and proper hookup of all CCV/vacuum hoses. 2) Check oil pressure 3) do a compression check.
Seems like excessive crankcase pressure and/or blowby is forcing oil up into the intake.
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Old 03-05-2015, 01:46 PM
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Maybe make a video of it running and were the oil/blow by is coming from
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Old 03-05-2015, 03:40 PM
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Originally Posted by Gmaster View Post
Maybe make a video of it running and were the oil/blow by is coming from
I think it's coming from the valve hose. It comes to the hole in the back of the airbox. Then down under it.
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Old 03-09-2015, 10:31 AM
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Obviously the PCV system is not functional. That large hose is an air INTAKE. The PCV (rear hose) should be sucking the vapors out of the valve cover. If that line or valve is clogged, or improperly hooked up, oil will come out of the front one due to excessive crankcase pressure.
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Old 03-09-2015, 10:13 PM
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I've decided to pull the 2.5l. Bought a donor 99 that has a solid motor / trans and tcase.
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