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Short and sweet. Had a oil leak, shop found it and had something to do with my intake. They basically had two lines ran into a clear bottle to check the oil, how much came through it, what color it was, etc. basically a catch can. So I didn’t want the stupid bottle so I got a actual catch can. Installed it. Now, since they did whatever to the PCV system and installed this catch can, at times it will idle up to 3k while in neutral and only go down when I get in gear. Just climbs, and feels like I have my foot on the gas holding it there. Then it still feels like it wants the rpm so start climbing. It only does it for a little bit and every once in awhile. So my question is?
1. this is installed correctly right? I know it is but the line coming from heads area running to the in of the catch can. Then the out is going to the intake manifold. My hoses are Long to make them work where I put the catch can, can this hose length have anything to do tie the idle and rpms? (I attached a video)
2. On top of my passenger valve cover there is a 90 degree fitting coming out of the top (towards the front) and no hoses or anything are attached to it? Did the shop disconnect a hose here for Some reason? Or is this normal for it to just be open. Thanks for any help.
you can see everything in the video.
well I can’t get a video to upload of course so here are the pictures
This line is going to inlet side of the catch can Catch can. And this is on the driver side by the front light, so roughly 24”-30” of hose ran for both in and out. Is this to long of hose? This is where the out is going to the intake manifold
This is the top of passenger side. No hose ran to it, not sure if the shop pulled the line off or what? Any help on this and if anything needs to be done?
thanks for any help. And any questions you have I will answer them ASAP. Just not sure if they need to just adjust my idle, or if I need to do something else with this pcv/ catch can situation.
The hose where the green arrow is pointing is your problem. Remove that foam and you will see that where the green arrow is pulled out of another section that it just simply slides into. They pull out rather easy and the foam hides it.
That is causing the massive vacuum leak and high idle.
awesome. I’ll check it out this afternoon and I’ll keep a update Wish I could upload a video but it won’t upload my iPhone movies
Originally Posted by 98CayenneT/A
The hose where the green arrow is pointing is your problem. Remove that foam and you will see that where the green arrow is pulled out of another section that it just simply slides into. They pull out rather easy and the foam hides it.
That is causing the massive vacuum leak and high idle.
ok I pulled off the foam insulation and the only place that tube runs is to the fitting behind the intake manifold. It has two lines going in one side and one coming out the other. Sorry for the bad picture. But is this the place where it might have come apart? Seems to be in there pretty good?
Originally Posted by 98CayenneT/A
The hose where the green arrow is pointing is your problem. Remove that foam and you will see that where the green arrow is pulled out of another section that it just simply slides into. They pull out rather easy and the foam hides it.
That is causing the massive vacuum leak and high idle.
Youre missing the hose that goes from the passenger valve cover to the throttle body. The hose you disconnected was right, goes into the "in" side of the catch can. The "out" goes to the intake. I have a LS6 valley cover so the system is a little different but same concept.
that must be why that 90 degree fitting on my passenger side valve cover goes too. Thank you. Did I see you kept your PCV valve on with your catch can? I just put mine back on, read in another post that it needed it. Thanks for your help
Originally Posted by blkbird
Youre missing the hose that goes from the passenger valve cover to the throttle body. The hose you disconnected was right, goes into the "in" side of the catch can. The "out" goes to the intake. I have a LS6 valley cover so the system is a little different but same concept.
Reinstalled both PCV valve on the inlet line going to the catch can.
And also reattached the line going from the passenger valve cover 90 to the throttle body (this wasn’t connected from the shop so not sure if it was left off for a reason or they forgot to put it back on)
Yes, i would still leave the pcv in line like you did. I just left the old pcv valve to help with the oil blow by. The LS6 valley cover has one built in. It helps some for me. Not too much oil gets collected in catch can. Did that solve your issue?
will check it out this afternoon after I get off work. Thanks again for the help
Originally Posted by blkbird
Yes, i would still leave the pcv in line like you did. I just left the old pcv valve to help with the oil blow by. The LS6 valley cover has one built in. It helps some for me. Not too much oil gets collected in catch can. Did that solve your issue?
PCV Valve reinstalled and throttle body hose coming from the passenger valve cover
here’s another question, wouldn’t you want the line coming from the valve cover to have a “catch can” before it went into the throttle body? Or is this just vented air and not much oil in it? Trying to learn what all this does piece by piece. Thanks for your patience
UPDATE: removed the smaller catch can and installed a longer, skinnier one to fit better. Everything is much closer. Removed 6’-8’+ of hose. Instead installed about 20” of hose all together. I think this should def help. I will get it out this weekend and see how it is.
The drivers side is fresh air in so pipe from intake pipe between air filter and throttle body to drivers side head.. you dont want vacuum this side
Block the rear pipe on passenger side head, then from front pipe to catch can in, then from catch can out to intake manifold which gives u vacuum
The drivers side is fresh air in so pipe from intake pipe between air filter and throttle body to drivers side head.. you dont want vacuum this side
Block the rear pipe on passenger side head, then from front pipe to catch can in, then from catch can out to intake manifold which gives u vacuum
thank you. I’m trying to learn. Just getting back into the car after almost 20 years. I promise I’m not a total idiot. Thank you for your help and patience
thank you. I’m trying to learn. Just getting back into the car after almost 20 years. I promise I’m not a total idiot. Thank you for your help and patience
You might want to keep in mind that in Australia, drivers' side and passenger side are switched. They driver on the right side of the car.
UPDATE: removed the smaller catch can and installed a longer, skinnier one to fit better. Everything is much closer. Removed 6’-8’+ of hose. Instead installed about 20” of hose all together. I think this should def help. I will get it out this weekend and see how it is.
This looks correct with the exception of no PCV valve.
Isn't this an LS1 in an F-Body car? If so then is should have two ports on the passenger valve cover and one on the rear of the driver side. Connect the rear ports to the catch can and then from the can through an inline PCV valve to the intake manifold. Front port of the passenger valve cover to the throttle body and your done. It's really that simple. I've seen the engine bay of enough LS1 Fbody cars and I'm certain this is one of them.
I'd make sure you don't have vacuum leak from the new 3/8 hose running into the large factory hose post sealed catch can.
This is a factory line and there's a special hose that connects the back two ports to another line which runs to the back of the driver side valve cover. If any part of this line has a hole or tear or fails to seal properly then your going to have a vacuum leak.
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Correctly Installed? 
