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Discussion Starter · #1 ·
I have a 94 900se 2.5 and cannot seem to locate the PVC valve. I am not getting any vacuum to the fuel pressure regulator and need to check and see if there is vacuum going to the PVC valve. Any help would be appreciated.
 

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A V6 ?

No pics have I:cheesy:
This will take some hunting.
I think the PCV system will run between the cam cover (one of them) and the throttle body, if this 6 is similar to the 4...
 

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Discussion Starter · #4 ·
I found out the valve itself is in the intake manifold and I need to trace the lines to the check valve. FYI for anyone who needs to know.
 

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Discussion Starter · #5 ·
Now I am told by the dealer there is no PCV valve just a check valve between the trottle body and the charcoal canister. They want 78.00 for the valve. Wow. What a rip. eeuroparts has it for 10.00 or 16.00.
 

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gthomp0805 said:
Now I am told by the dealer there is no PCV valve just a check valve between the trottle body and the charcoal canister. They want 78.00 for the valve. Wow. What a rip. eeuroparts has it for 10.00 or 16.00.
1) That is the evap canister purge valve, nothing to do with crankcase ventilation. Easy to check if it is leaking vacuum, cap the line off with a rubber cap from any part store, and check the vacuum before and after.

2) The 3.5L V6 DOES have a PCV valve/filter, the crankcase ventilation system is GM, and completely different from any of the 4-cyl engines. Assuming it is faulty, which is not common, I doubt eEuroparts has it for $10, it is a fairly complex part compared to the turbo PCV check valve, GM list price is around $150.

3) The original p/n's for the V6 are as follows:

Article : Crank case ventilation
PartNo : 4504882
Usage : 1994, NLS-USE 4770160

Article : Positive crankcase ventilation valve
PartNo : 4770160
Usage : 1995-1997
 

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Discussion Starter · #7 ·
I appreciate this information. thesaabsite has it for 143 and change. Do you know why I would not get vacuum to the fuel pressure regulator? There are 2 ports coming off of the throttle body. One goes to the regulator the other is capped.
 

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gthomp0805 said:
I appreciate this information. thesaabsite has it for 143 and change. Do you know why I would not get vacuum to the fuel pressure regulator? There are 2 ports coming off of the throttle body. One goes to the regulator the other is capped.
I don't know the V6 well enough. I think Ragtop is the resident expert or close to it.

I don't think I would just start swapping parts on a guess.

On the 4-cyl I would first test, or just replace the hose to the FPR. Then I would remove the other TB connections one at a time, and temporarily cap the ports while measuring the vacuum at the FPT using a gauge and T off the line etc...

The evap canister purge valve can be tested, I do know that, but I do not know anything about the V6 PCV system testing. On the 900 turbo, most vacuum leaks are from cracked hoses, example:



This was part of the FPR hose from a 900 Turbo, obviously, a hose will not hold vacuum in that state.
 

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Discussion Starter · #11 ·
There is no hose off the intake manifold. There are 3 off the throttle body, one goes to the IAC valve, one to the fuel pressure regulator and the other to a check valve which then goes into the fire wall to the charcoal canister. There is no PCV valve on a V6 so finding this crankcase breather housing has been quite a chore. Ah, unless the charcoal canister and the crankcase breather housing are one in the same. Can someone confirm?
 

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In this context, the throttle body and inlet manifold are a common source of vacuum. The older Saabs used ports on the intake manifold.They can be anyplace where an adequate vacuum is generated...

To find the PVC(positive vented crankcase) valve system, you may well have to remove the intake(inlet) manifold (same as when changing the 3 rear plugs)....
This is conjecture on my part; but the PCV exists, if it is not in the open, then one must "dig" for it....
 

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Discussion Starter · #13 ·
Been down that road as well. I assume there is no one in this forum familiar enough with the V6 to help. It's off to the dealer than. My mechanic can't find it either. Thanks for everyone's help.
 

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Have patience.

Repost this as " V6 PVC valve, where is it ?" Ragtop or Diosnoche, or PMI, are bound to respond....

Why pay the dealer $100 just to find it ???
 

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Discussion Starter · #15 ·
I have been trying to get this fixed for about a week. The car in general has run crappy since I bought it in Aug. I am trying the least expensive routes first as anyone else would. I am getting 8MPG. ugh! PMI has responded that he is not that familiar with the v6. Funny, I called the dealer about the PCV valve and the parts guy did not even know the v6 does not have one. He kept putting me on hold and going back to the service department to make sure I knew what I was talking about. Havent heard from the other 2 gents and I am running out of patience. Sorry, I never had much to begin with.:D
 

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PMI is honest. The Saab dealer has sold 3 V6s over the past 3 years(explaining why their knowledge is limited);parts-men (far too many) know nothing, and are not well paid; the smarter men are busy selling the Saab turbo...:cheesy:

Repost this as " V6 PVC valve, where is it ?" ....
BTW, I doubt is the PVC has very much with the poor running, but of course it should be examined..
And I hope you do have a warm garage...
The Saab V6 is a rather rare bird - thus, patience is a must...:cheesy:
 

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Discussion Starter · #17 ·
And I appreciate the honestly and nothing less. I suppose you are right about the poor running. I suspect that is the tensioner which the dealer never warned me was going bad when they did the timing belt. As for the garage, yes it is heated. LOL. Would have it no other way as I have a 84 318i that my son and I frequently tinker with. I will repost (good idea) and thanks again for your help.
 

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gthomp0805 said:
There is no hose off the intake manifold. There are 3 off the throttle body..
I have not worked on the 6-cyl engine. I assumed someone with the same model would pick up the thread. The diagram shows two hoses, not sure where one goes, perhaps the TB. The second hose looks like it drops right down from the bottom side of the intake manifold. Seemed straight forward to follow the hose, but perhaps it isn't, sorry.
 

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Hi, the V6 doesn't have any sort of PCV valve system, there is none, so don't waste your time hunting one down on the 2.5L V6 engine.

I once had a photo on here of my throttle body with the 3 vacuum ports and lines, i'll try and find the original for you, if anything I take a new photo of the vacuum lines for you.

But don't bother looking for a PCV valve, there isn't one.

In my opinion, the V6 is a very nice engine, if you understand it. The V6 doesn't demand alot of maintenance, but it does demand respect in the sense that you do the recommended service as outline in its literature (timing belt for example, oil changes with 100% synthetic).

If you're generally having poor MPG, service the Upstream Oxygen sensors, Bank 1 Sensor 1 and Bank 2 Sensor 1, don't worry about the downstream sensors just yet. Clean and inspect the IAC which is located under the intake manifold, inspect and clean the MAF, perhaps get a motorvac done of the fuel injectors and fuel system, change the air filter, change the fuel filter. Use the recommended spark plugs (Bosch FR8LDC) which are the factory plugs and are dual tipped for a dual spark, change the high tension wires. Basically a complete tune up.

Perhaps you could elaborate on what the symptoms are and your problem.
 
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