I need help! I dont know what went wrong...

GTA_V6_Mustang · Jan 31, 2007

Ok well I decieded to replace the crankcase breather on my car just now and well after fighting and prying I replaced it. Well when I started my car I hear a whistleing. Then it starts idling funny. Then it started to stall while idling and when you give it gas it seems to be fine, as long as its revved. I know its a vacuum leak, Just dont know from where it could possible be. I checked the hoses for the pcv valve and they seem fine, and the tee there for the hose that runs to the pcv to the manifold or something and to somewhere under the manifold is good. Any other suggestions?

tjh566 · Jan 31, 2007

check any and all vaccum hoses u see.

Did you replace the rubber grommet that the pcv valve goes into, that could have a hole in it or be ripped or something.

Not sure what else to check after that. could be a few things.

GTA_V6_Mustang · Jan 31, 2007

Yeah I put that grommet in about a month ago and never had any problems with it prior to this. AGH!!! this is aggrivating... And I know its coming from the area where the tee is but I cant figure out exactly where.

tjh566 · Jan 31, 2007

spray starting fluid or carb cleaner or something of that nature along the vaccum lines and when the motor revs up your leak is around where u were sprayin. could work???

HISSIN50 · Jan 31, 2007

With a larger vac leak, be very careful of flammable fluids (like starter fluid, carb spray, etc), as an explosion can occur.

We don't have crankcase breathers stock so I'm not sure how custom your set-up is, but at times I've put mechanics gloves on and held vacuum hose junctions. My hand would make the hiss change pitch and I knew I found a connection that needed addressing. Be careful of moving parts, hot parts, etc.

One long shot is that some PCV valves (if applicable) come with a capped second nipple. Ensure that second fitting is capped.

Good luck.

GTA_V6_Mustang · Jan 31, 2007

Theoretically I guess yeah it could work. I will try this tomorrow at work then... A friend of mine there has some starting fluid. Just afraid of hitting a hot spot and BOOM, lol. Any other suggestions? This sux ass man! I fix one thing and get another problem!

GTA_V6_Mustang · Jan 31, 2007

We don't have crankcase breathers stock so I'm not sure how custom your set-up is

Yea we do, my car is pretty much bone stock and the "Crankcase breather" is under the pcv valve and is the metal mesh thingy there. lol

GTA_V6_Mustang · Jan 31, 2007

tjh566 thanks for the advice. I went out there with a can of throttle body cleaner and sprayed the tee and the pcv valve and nothing, Scared the manifold gasket **** itself I sprayed around where the upper and lower manifold meet to check if that was leaking but nothing. Then I sprayed under the upper manifold around the middle of it where there is a vacuum hose running to and it revved itself up. So what could this mean? That third hose is no good? since it is all dry rotted and super stiff does this mean I could have cracked it? I will replace that hose tommorow as soon as I get to work but what I am worried about is where that hose goes to the manifold is that metal? Because I hope by my prying on that hose I didnt damage it if it is not metal.

HISSIN50 · Feb 1, 2007

You're right about the breather - we tend to call it a mesh screen (parts stores are the only ones who call it a breather - it's really more like a filter). I simply thought you were talking about conventional open breathers before - my bad.

You are right on about the flammable liquids. If you are spraying that stuff and have a backfire, watch out!

The hoses under the plenum (upper intake - you got me watching my phrasing now. ) are really prone to vulcanizing. I wouldn't worry about the fitting on the intake - you'd have to really pry on it to screw it up. If you did, it should be easily fixable.

Good luck, and sorry again about the misunderstanding.

GTA_V6_Mustang · Feb 1, 2007

Hehe no big deal man, I appreciate the help though... Well I will try to replace it once I get to work now, I only hope that she can make it there with that vacuum leak, its 15 miles highway so I will have my fingers crossed, lol. By the way the on in there was like really dirty what is so good about replacing it? Just curious, because I replaced it since well i know it should have been replaced but now I am asking myself what will this help thanks again.

GTA_V6_Mustang · Feb 1, 2007

Ok well I pulled the hose I was talking about that is teed into the pcv and it looks fine no cracks it is dry rotted but no cracks looks pretty solid... Is there anything other vacuum lines under there I should check? I know its coming from under there because nowhere else I spray causes the engine to rev up when I do.

HISSIN50 · Feb 1, 2007

If that breather element clogs up, it causes excess crankcase pressure. This can lead to seals spewing oil, excess oil in the intake and TB, and so on. It's not good.

There are a few vac lines under the intake and the fitting itself. Dry rotting can still mean a leak (right at the fitting is where the lines often rot the worst).

Good luck.

gcomfx.com · Feb 1, 2007

Vacuum lines are cheap... replace them anyway.

GTA_V6_Mustang · Feb 1, 2007

gcomfx.com said:
Vacuum lines are cheap... replace them anyway.

Yeah I know, they are free for me here at work

Bosko5.0 · Feb 1, 2007

there is a smaller vaccum line not a plastic one but a rubber one that goes to evac system aka purge valve all you have to do is pull on it lighty it should just fall apart well atleast myne did replace it. even if the hoses are cracked but no leaks just so you dont come up with a leak down the road and since you get them for free it makes it even better

GTA_V6_Mustang · Feb 1, 2007

Bosko5.0 said:
there is a smaller vaccum line not a plastic one but a rubber one that goes to evac system aka purge valve all you have to do is pull on it lighty it should just fall apart well atleast myne did replace it. even if the hoses are cracked but no leaks just so you dont come up with a leak down the road and since you get them for free it makes it even better

Yeah when I was putting the new hose that went under the manifold from the tee for the PCV I noticed that there was another fitting down there but nothing was hooked up to it. Searched around the PCV area and found a hose that had dry rotted and shredded to peaces. Well I replaced that hose and everything seems good to go now. My car no longer idles like ****, and it seems to be a bit better on gas. I have no idea yet though because by fixing my speedo I broke my odometer gear but thats a whole other story. lol and thanks a lot for all your help guys. As soon as I get my overage check from school I will be replaceing both o2's and hopefully my mileage will finally get to what it should be. Also you think if that hose had a small developing leak it could be what caused the code for my evap canister thingy? lol

TurboSnake95 · Feb 1, 2007

GTA_V6_Mustang said:
Yea we do, my car is pretty much bone stock and the "Crankcase breather" is under the pcv valve and is the metal mesh thingy there. lol

What's a part number on this piece, mine is old and nasty looking.

Thanks, Will

P.S. Nevermind I found it, thanks anyways.

GTA_V6_Mustang · Feb 1, 2007

TurboSnake95 said:
What's a part number on this piece, mine is old and nasty looking.

Thanks, Will

P.S. Nevermind I found it, thanks anyways.

Lol, no problem I guess. Good luck replacing it though... Mine was such a pain in the ass.... It was such a pain in the ass getting the concrete screw in there but when I finally did I screwed it in there pretty well, then I used a screw driver and pryed up on it and finally managed to pull it out. Dont know what else I should replace as far as maintenance goes I have replaced the pcv valve, pcv valve grommet, "crankcase breather", spark plugs, distributer cap & rotor. any other suggestions? (also of course oil and filter.

HISSIN50 · Feb 2, 2007

The computer only can monitor the cannister purge solenoid (the black plug lookin deal that has rabbit ear vacuum lines going in and out of it). The computer has no idea if the vac lines are connected or anything else (you can use that solenoid in your back seat and have it connected and pumping from a bottle of air freshener - the computer wont know. ).

Grab up a bunch of vac line and replace every line you can. You will have to remove the passenger wheel well to get to the charcoal cannister and other lines. It's well worth it - the charcoal cannister lines egressing the cannister always bake (Paul happens to be an expert on Charcoal cannisters as I recall ). The lines under the intake manifold also bake. Once all lines are replaced, you will feel better about things (and be surprised how bad some of those old lines were).

The vac leak could definitely cause a lean/O2 code if you got one of those.

Good luck.

GTA_V6_Mustang · Feb 2, 2007

The computer only can monitor the cannister purge solenoid (the black plug lookin deal that has rabbit ear vacuum lines going in and out of it). The computer has no idea if the vac lines are connected or anything else (you can use that solenoid in your back seat and have it connected and pumping from a bottle of air freshener - the computer wont know. ).

Well thanks for making me feel silly.... lol

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