Pcv from breathers to catch can = rough idle and engine light? - Mustang Evolution

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Old 01-24-2015, 08:22 PM   #1
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Pcv from breathers to catch can = rough idle and engine light?

So I have breathers on the valve covers and the inlet on the boss intake capped off. Cars tuned and runs great. Unfortunately sometimes I tend to get some oil residue past the passenger side filter and on the coil cover. In an attempt to remedy this, I purchased a jlt catch can from someone. After install the car has a lopy idle and throws an engine light for multiple cylinder misfire. What's the problem and fix?

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Old 01-25-2015, 09:50 AM   #2
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Just a shot in the dark here. But if you have the stock lines hooked up, the driver side sucks air in from the post MAF section of intake tube. So the air has been metered. After it runs its course through the engine and comes out the passenger side, it makes its way into the intake manifld. Therefore the air has already been metered and accounted for.

However if you unhook both lines, and plug the intake tune port and the manifold port and use breathers, it just sucks air in one side and blows it out the other.

Then if you were to leave a breather on the driver side, which would be the pcv intake side and then hook up your stock line or in your case a catch can back to the intake manifold, then you are introducing unmetered air into the intake. It passed through the engine but not through the MAF therefore is unaccounted for.

Should make for a slightly lean condition if the computer doesn't fix it via O2 sensor readings which I doubt.

I would suggest plugging your stock line back into your driver side and back to the intake tube and see if that makes it go away. I would guess that it does.
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Old 01-25-2015, 09:58 AM   #3
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One more thing to check if your routing is correct. I have heard of the JLT cans leaking vacuum. You can use a can of carb cleaner to spray around potential leak areas while car is idling, can fittings, seams etc. If you find one you will hear a change in idle. I agree you have a lean situation do to unmetered air entering the loop.
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Old 01-25-2015, 11:05 AM   #4
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On a Boss, JLT goes on driver side & On GT JLT in on passenger side


Hammer Down !!!
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Old 01-25-2015, 01:06 PM   #5
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I think they can go on both sides. The passenger side is where I get the reside from filter tho

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Old 01-25-2015, 01:08 PM   #6
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Well it should get some air flowing through it right? I mean I took a look at the factory tube I have and it's just a straight through tube.. So of course it's going to get air through it. If I blow on one side of the catch can I can feel air coming out the opposite side. Is that normal or no?

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Old 01-25-2015, 02:34 PM   #7
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I think they can go on both sides. The passenger side is where I get the reside from filter tho

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If you have a breather on the driver side and you have hooked up a pcv on the passenger side to the catch can and then connected to your intake by the throttle body you are taking in unmetered air and it will run lean. With the pcv hooked up like described above that clean air intake on the driver side needs to be connected to your intake air inlet after the air box and maf sensor. You can't use a breather filter on the drivers side in a pcv system.

This is correct install of catch can on a NA application. Boosted can use a can on the driver and passenger side but not NA as it is not necessary.

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Old 01-25-2015, 02:38 PM   #8
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If you have a breather on the driver side and you have hooked up a pcv on the passenger side to the catch can and then connected to your intake by the throttle body you are taking in unmetered air and it will run lean. With the pcv hooked up like described above that clean air intake on the driver side needs to be connected to your intake air inlet after the air box and maf sensor.

This is correct install of catch can on a NA application. Boosted can use a can on the driver and passenger side but not NA as it is not necessary.

Ahhh ok, so I have the one end of the catch can plugged into the valve cover. The other end says intake on it. I plug that into intake but yes it is unmetered, so what else do I need to do? Hook something up on the drivers side? Never messed with this Pcv things before or paid much attention to them. Guess I should have...

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Old 01-25-2015, 02:46 PM   #9
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Ahhh ok, so I have the one end of the catch can plugged into the valve cover. The other end says intake on it. I plug that into intake but yes it is unmetered, so what else do I need to do? Hook something up on the drivers side? Never messed with this Pcv things before or paid much attention to them. Guess I should have...

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It is only unmetered air entering the system if your driver side valve cover has a breather filter in it. The picture below shows the driver side hooked up correctly.

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Old 01-25-2015, 02:49 PM   #10
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Yes I only have a breather on the drivers side. So look like from above I need to remove the breather and complete the Pcv system by putting the Pcv hose back on the drivers side like stock?

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Old 01-25-2015, 02:53 PM   #11
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Yes I only have a breather on the drivers side. So look like from above I need to remove the breather and complete the Pcv system by putting the Pcv hose back on the drivers side like stock?

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Yes perfect. That is where your unmetered air is coming in. It is like having a giant vacuum leak.
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Old 01-25-2015, 03:02 PM   #12
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Figures. Never thought about it. Thanks for the info I'll get it fixed up and report back if that fixes it!

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Old 01-25-2015, 04:41 PM   #13
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Welp this just answered my question i just asked on the UPR catch can thread. So when my UPR comes in I will take my breather off also. Thanks Bigjay
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Old 01-25-2015, 07:37 PM   #14
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Welp this just answered my question i just asked on the UPR catch can thread. So when my UPR comes in I will take my breather off also. Thanks Bigjay
Do you run breathers both sides now?

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Old 01-25-2015, 08:22 PM   #15
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Yes im running breathers on both sides right now with no issues other then the smell of oil in the cab.
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Old 01-25-2015, 09:14 PM   #16
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Yes im running breathers on both sides right now with no issues other then the smell of oil in the cab.
Okay makes sense.

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Old 01-26-2015, 10:29 PM   #17
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Ok, so got drivers side hooked up and now the idle don't sound like a lopy cam but does idle about 200 rpm higher then with just breathers. I checked for leaks by spraying some carb cleaner around the connections of both ends of the pcv tubing on both sides and heard no change in idle. This has got me stumped. Could it be because my car was tuned with breathers?

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Old 01-26-2015, 11:21 PM   #18
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I'm not much on tuning. Do you have a pcv valve in the pass side? If yes, maybe a reflash might help...not sure.
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Old 01-27-2015, 12:04 AM   #19
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Nope no valve. I was wondering of there's supposed to be one?

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Old 01-27-2015, 07:05 AM   #20
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Nope no valve. I was wondering of there's supposed to be one?

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Yes you need a stock pcv valve in pass side cover. It regulates vacuum and you are still lean without it.

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Old 01-27-2015, 12:03 PM   #21
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I have the boss mani if that matters at all, not sure if anything is different. So valve hooks up at the connector on the valve cover or on the tb port where the hose attaches?

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Old 01-27-2015, 12:56 PM   #22
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I have the boss mani if that matters at all, not sure if anything is different. So valve hooks up at the connector on the valve cover or on the tb port where the hose attaches?

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Yes should put valve in at pass cover then connect jlt hose to the valve. If you can take a picture and post it showing you routing after the valve. What happened to all the stock stuff you took off?

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Old 01-30-2015, 02:36 AM   #23
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Came with boss. Just got stock mani with it. I'll get pics

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Old 01-30-2015, 05:17 AM   #24
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Could it be because my car was tuned with breathers?
No. There is no adjustment in the tune to compensate for a breather setup.
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Old 02-04-2015, 01:55 PM   #25
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How does the blue connector disconnect from the passenger side valve cover? Doesn't seem to turn and I do not want to break it.

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Old 02-04-2015, 02:14 PM   #26
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It unscrews counter clockwise.

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Old 02-04-2015, 07:52 PM   #27
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Thanks grabber

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Old 02-09-2015, 01:37 PM   #28
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Sure enough my fitting didn't have a Pcv valve in it so replaced it and everything is as it should be now. Thanks for the help guys.

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Old 02-09-2015, 03:10 PM   #29
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Sweet good to hear!

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