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  • June 16, 2019, 09:08:19 PM

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Author Topic: Persistant PCV Oil Issues  (Read 140 times)

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Online MIPS

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Persistant PCV Oil Issues
« on: May 12, 2019, 01:55:46 AM »
When I got my Eagle it had a major issue with oil being blown back into the air cleaner and making a mess of the filters and the carb.



I've already checked the cylinder compression and even with a poorly fitting tool found that each cylinder was between 135 and 140PSI, so there shouldn't be serious blow-by. I was finding that I would sometimes have an acceptable vacuum present at the valve cover breather port but other times it was not there. I replaced the valve cover gasket, replaced the valve cover grommets and replaced the PCV, related hoses and PCV breather filter element.



I am still however finding that only after a week the filter is turning yellow and oily from oil being blown back into the cleaner. Sometimes I'll inspect it and find the positive pressure in the crankcase has forced the element out of the orange housing. Where on earth is all this supposed blow-by coming from? I'm not getting smoke out the filler cap when revved or crazy amounts of burning oil.

Offline AMC of Houston

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Re: Persistant PCV Oil Issues
« Reply #1 on: May 12, 2019, 01:07:23 PM »
Not sure what year your Eagle is; but do you still have the PCV Solenoid plumbed into the system??  It shuts off PCV vacuum at times.   It should have disappeared years ago due to an AMC Recall, and been replaced by a special hose with an orifice within.
George G.
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Online MIPS

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Re: Persistant PCV Oil Issues
« Reply #2 on: May 12, 2019, 03:39:30 PM »
Sorry, 82 model year.

My Eagle does not have the solenoid but it also doesn't have an orifice-fitted hose.
This is what it came with. White plastic elbow and rubber hose to the cleaner. Nothing else came out when I squeegeed the oil out of it so it's just an unrestricted connection.

« Last Edit: May 12, 2019, 03:39:38 PM by MIPS »

Offline AMC of Houston

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Re: Persistant PCV Oil Issues
« Reply #3 on: May 12, 2019, 06:37:22 PM »
That hose should be an unrestricted hose, as its the PCV system "intake".  No problem there. 

The solenoid and/or recall hose would be plumbed in from the PCV valve to the base of the carb.  The original solenoid electrical connector is probably still laying somewhere around the carb/intake.
George G.
'81 Eagle Sundancer
'85 Eagle Waggie
1960 1902 Rambler Replica
'64 American
'70 AMX (Big Bad Blue), '70 AMX (White)
'77 Gremlin
'78 Pacer Coupe, '78 Pacer Wagon
'79 Pacer Wagon
'73 Jensen Interceptor
'86 Audi 5000 Turbo
'98 Aston Martin DB7
'09 Nissan Titan
'10 Nissan Maxima

Online MIPS

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Re: Persistant PCV Oil Issues
« Reply #4 on: May 12, 2019, 09:49:38 PM »
When I replaced the PCV vacuum line I found no traces of the solenoid or anything else attached to or inside the old hose.

Offline Eagleearl

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Re: Persistant PCV Oil Issues
« Reply #5 on: May 14, 2019, 06:48:01 PM »
Interesting. Do you have good vacuum at the PCV valve?

Online MIPS

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Re: Persistant PCV Oil Issues
« Reply #6 on: May 19, 2019, 09:44:56 PM »
It has a strong vacuum at the PCV at idle.

I actually did a 400km trip starting Friday and noted that the hard load of two mountain passes blew a ton of oil back into the air cleaner and ruined the filter. I wiped down the cleaner housing and replaced the breather filter and the next 250km downhill and on flat highway has been great with pretty much no oil in the cleaner.

 

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