Positive Crankcase Ventilation system problem please help

[oneqwicksho]

Well while trying to figure out my fuel pressure problem I thought " why not check vacuum lines ". When I pulled the pcv hose off of the front of the throttle body to do a test there is no vacuum. I did notice there is oil in my intake and, I am using oil.

So far I have tried the following to figure out what is going on-
1. If I blow thru the hose it tries to stall motor
2. With motor off if I blow thru the hose I hear air leak throu the intake tube (good. I think?) , it leaks at the FPR hose and, I hear it leaking air at the back passenger side of the motor somewhere.

Do you think this could cause a fuel pressure problem?

Thanks mike

P.S. I would link my other post to this one but I'm doing this on my blackberry

 

[oneqwicksho]

bump. any one know why i would not be getting vacuum? and, know how to fix this problem?

thanks

 

[1bad98SHO]

So there is no vacuum at the intake portion of the PCV hose or at the PCV end of the Hose? Have you taken the PCV out the hose and blown through it. Chances are the pcv valve is clogged.

 

[oneqwicksho]

So there is no vacuum at the intake portion of the PCV hose or at the PCV end of the Hose? Have you taken the PCV out the hose and blown through it. Chances are the pcv valve is clogged.

Correct no vacuum at the intake/TB portion of the PCV hose. And, I don't think gen 1 sho's have a pcv valve. Could be wrong tho

 

[BlackonBlack89]

The CCV (VC to mani) does is to replace the air that the PCV (valley to bottom of TB) is sucking into the engine/intake. which is why the intake has oily black deposits everywhere also. The CCV is behind the TB plate so it should be garantee'd to have vac, it has too. The PCV has holes all over inside the TB on both side of the TB plate.


I am 99% sure those 2 lines will not cause any FP problems. Unless they are old, cracked and causing a vacuum leak. Which any vacuum leak will have problems. Vacuum is wat the FPR uses to control fuel amounts. But u should also be having a rough running motor if there a leak. or atleast a miss here and there.

You said the FPR refernce line is leaking?? I think that may be the main problem......

 

[Off Road SHO]

I don't understand what you are trying to say. The PCV hose on the SHO comes from the oil separator deep inside the "V" of the motor. It attaches to the throttle body by way of a 90 degree fitting on the bottom of the throttle body. You have this hose disconneted from the 90 degree fitting, while the engine is running, and you can't feel a vacuum when you put your finger over the open end of the 90 degree fitting, right? Is that what you are saying?

Tom

 

[oneqwicksho]

Blackonblack89, no lines are cracked or dried out but, yes when I blow thru the hose that comes from the vc and, leads to the front of the tb with motor off air leaks out aroung the ****** on the fpr, and through the intake and, back side of motor. I get poping thru the intake from time to time, plus I do have a random miss and, at wot there is almost no differance in vacuum at the fpr. Off road sho, the hose were talking about is the one that comes from the front vc to the front of the tb, with motor running if I pull that hose off there is no vacuum at all, not even enought to hold a small piece of paper up to it, when there should be a lot of vacumm there Thanks for the help guys

 

[BlackonBlack89]

Ur confusing me. From the sounds of things it sound like u have the lines going to the wrong places or it ur descriptions....i think its the 2nd one.

Front of TB would be IMO where rubber tube is. No vacuum there nor any nipps to put something there. 2nd the ****** is on the intake manifold itself not the TB. the one from the V/C.

Find where its leaking. Back of the motor, there is only the big vacuum line and the secondary controls. there 2 nips for that. The FPR line. and the CCV line. The PCV which is the big one under the TB. other than bad gaskets, loose couplings, or disconnect line there should be no leaks. also the vacuum ee by the master cylinder but that hasn't been touched.

And how are u blowing air in there? Must take alot of air to compress the whole intake, block and it should leak out the TB cause it not a perfect seal. are u using an air compresser???


And U HAVE to HAVE vacuum where the tube from the V/C goes to the intake. Its behind the TB plate. The engine has to be sucking in air if its running. Maybe the hose is clogged.

It should be at 39 at idle and go down with vacuum. IE -18vac should equal 30psi at the rail.

 

[oneqwicksho]

Yes sorry for my poor description. that's the right hose. Pulled the hose off and can blow thru it so its not clogged. But, when I put the hose back on and start motor and let run no vacuum from hose at all. I'm 22 and going bald because I'm pulling my hair out. I have looked through 2 diagnosis books and can't figure it out.

I am blowing thru the hose with my mouth

And I get when I start the car 34 psi and wot it spikes 39psi and drifs down to 36psi

 

[SuperHO]

wow...both of my PCV lines are currently venting to the atmosphere, with electric tape blocking off the holes in the throttle body. only change is a burnt oil smell from time to time, especially after a couple of WOT pulls.

 

[BlackonBlack89]

Dude idk WTH is going on. Maybe the ****** iteslf is clogged with carbon build up. Thats the only thing I can think of.

 

[oneqwicksho]

Tell me about it I am going nuts trying to figure it out. One thing that is nice is this weekend it is getting the top 60K done and, I am going to take the tb and intake completely apart and, run them thru parts washer wile there going to check that leak at back of the motor, plus double check the secondaries lines, unless when I blow its leaking air from the valve cover gasket but it shouldn't leak there. Right?

 

[BlackonBlack89]

idk but this blowing air thing.............. would make me nervous lol

sounds like with the intake rebuild it should fix the problem.

 

[oneqwicksho]

idk but this blowing air thing.............. would make me nervous lol

sounds like with the intake rebuild it should fix the problem.

Lol you trying to say something bad j/k

I'm praying it fixes the problem if not idk what's next

 

[oneqwicksho]

Is this normal? I pulled the lower pcv hose on the bottom of the TB. And, it is puffing out smoke and, is in rythem with the idle

And, still know vacuum on the side hose. Where the lower hose hooks to the TB is there spose to be vacuum on the TB ******?

 

[oneqwicksho]

Anyone know or could they check if the ****** on the tb for the lower pcv hose has vacuum or not

Thanks

 

[Off Road SHO]

Smoke vapor is normal coming out of the crankcase, it's called blowby and is normal for all piston motors. If you don't have a slight vacuum on the ****** on the bottom of the throttle body (where that crankcase hose came from), you probably have a gummed up passageway. The oil vapors are hotter than the throttle body so they condense on the inside of the passageway and eventually clog it up. Shoot some BerryMan's B-12 in there, let it soak, shoot some more, let it soak. It will clean it out.

Tom

 

[shomtx95]

yes, the ****** on the bottom of the throttle body should have vaccum. The hose that comes form the valve cover to the front of the throttle body is not supposed to have vaccum, trust me, take of your throttle body. The little ****** leads through a tiny port that goes in front of the throttle blade, hince no vaccum.

 

[oneqwicksho]

Ok took TB off completely cleaned it put it back togeather. and, still no vacuum. I think the oil separator is cloged. and, if so how do you clean it?

Thank you everyone for help

 

[Off Road SHO]

Just to be sure, the vacuum should come from the TB ******; not the hose that goes down to the oil separator down in the "V" of the engine. No need to clean the oil separator until you take the whole engine apart. Just put a longer hose on the separator and run it down into the air stream under the car. And plug the 90 degree fitting on the TB.



Tom