When driving my car at VOT, I smell heavy oil/gas fog in the coupe, just after giving VOT. Probably going through air-ventilation holes, from engine room. This is probably PCV-gases.

So, where does gases come from?

I have checked the PCV-valve. It does function. I pull it out from the valve cover and can feel the vacuum at it. When shaking it I also hear the ticking from it.

But, I found that the brommet / gasket this PCV valve sits in is not complete air tight. Is that normal? I can see a little bit oil sweat beside PCV valve, but I want to check out other possibilities first, since I dont think this very small passage can let out that much smell. (Pic 003)The brommet / gasket is not broken.


But, I saw that the hose from the PCV valve was not going to the carburetor (Edelbrock) PCV port. Instead, the hose was going to a nipple at the inlet manifold (Performer rpm), just between the carburetor and distributor. The hose at the carburetor PCV port is going to brake power unit.

Is this hose-routing OK? Does it make any difference coupled this way (it`s vacuum present both places)? Or can this "hose-twisting" cause this smell problem?

The nipple I mention at the intake manifold is a "double" nipple. (Pic 004)Nipple 1: PCV valve hose. Nipple 2: A thin hose, going together with electrical cables behind the engine, at the wall. Could this cause a problem? What function has this hose?

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No catalysator, no computer, no EGR, no ****.

 

You norweigens have a funny way of talking no offense, just amuses me.

The expression is "WOT", as in Wide-Open-Throttle. Just so there's no confusion...

Your PCV valve seems normal and ok. It should be pretty tight, but a little loose probably wouldn't cause you any smell. The house being routed to intake manifold instead of carb, will not cause any problems. Your PCV and power brake hoses are swapped, they are supposed to be opposite. This shouldn't cause any problems however, just longer hoses.

The "T" fitting (nipple as you called it), and the hose that goes with wires, back towards the firewall? That smaller hose probably is for your heater controls, (HVAC), no big deal.

Looking at your motor from the front of the car, your PCV is on the right side valve cover right? So what is on your left side valve cover? There should be a breather, or a fitting going to your carb correct?

One thing to check, while the motor is running, grab the throttle cable at your carb, and rev it up. Can you see smoke coming from anywhere? Check your oil dipstick tube area, PCV valve area, and your other valve cover, and your carb.

 

Vide oopen trottle?

Well the PCV "should" be connected to the large port on the front center of the carb, brake booster is often located at the back port of the carb and accessories are run from the vac fitting on the manifold.

But it doesnt really much matter. As long as the brake booster connects directly to a vac source without any sort of tee fitting, for safety reasons the brake booster line should always be on a dedicated line.

As for the PCV's function. When your engine is running you will always get a slight ammount of combustion fumes (alot more on old burnt up motors) that blows by the piston rings (appropriately called "blowby")

This mixture of noxious fumes can break down the chemical structure of the oil and cause even more problems for you. So they have installed the PCV (positive crankcase ventillation) which sucks this nasty mixture of fumes from the crankcase via the PCV valve, meanwhile drawing fesh air through the breather on the other valve cover keeping the air in the crankcase somewhat fresh to minimize oil breakdown and deposits

 

84z28350:

I have to disagree, not that it matters, but the things you say ARE true but NOT the reason you have a PCV valve. Back in the bad old days we had "road draft tubes" nothing more than a hole in the block with an elbow directing it towards the road ( hence the name) the function of which is to keep crankcase pressure from being a problem. remember all that air the pistons are moving on the top ? well they move an equall amount on the bottom (also the reasons for windage trays) you need someplace for the air to in and exhale otherwise you blow out dipsticks and main seals and the like. The real reason we have this reingestion system called PVC is because the EPA mandated it (1965 if I am not mistaken) and we (they/whoever) were no longer allowed to just vent air contaminated with oil and fuel mist to the atmosphere.

the result is the same, not sure even why I botherd to post anything, just getting old and crotchety I guess.

Dan

 

Hehe, thats okay. By the way, we are "norwegians", not "norweigens"

Of course, I remember now

Good, that`s what I was thinking too. I expected that since vacuum is present both places. By the way, the hoses was that way from the former owner.

Aahh, yes of course...its vacuum in the heater control system. Thanks for the info.

Yes, PCV valve is on the valve cover at the drivers side. And yes, passenger side valve cover has a thick hose, going to air filter. Its a breather, yes. You see it at the second pic, at right side at the pic.

No smoke coming from engine at all. Just fumes in coupe after WOT. The engine seems very thight and in good shape (perform very good, and no black or blue smoke from exhaust.) Well, I will take a closer look at all hoses etc. And change routing of those two hoses, just to make that correctly. Thank you guys. If you have more comment, feel free to post.

 

hmm, exhaust leak under car perhaps?