what would happen if the Valve Cover...

[eL eS]

What would happen if the VC was not on a securely as it should be how would the engine run? Or would there be not impact at all other than leakage.

 

[eL eS]

spoke with my neighbor that own a shop and he said it would just leak a little oil. I should have asked why do they put the vent tubes in that feed into the throttle body. Any one have the answer to that?

 

[SurfjaxLS]

It's too put unburned gases into the cylinders again. It increases fuel economy. It allows you to consume less fuel because some unburned hydrocarbons (I think) are mixed with the incoming air.

 

[billvaughn]

Last but not least it's better for the enviorment.......

 

[eL eS]

Thanks fellas. Funny so far all participants in this thread are from Florida.

Seems to me you risk the chance of gumming up the intake by sending exhaust gases back in. Plus the introduction of hot air ito a cool air stream would rob you of the chance of getting better combustion. I see their point for fuel economy though.

 

[SurfjaxLS]

You can always route the houses somewhere else, so that none goes in the intake. You'll lose some fuel economy, but I don't think you would notice any HP gains.

 

[eL eS]

well i noticed some tarnishing inside the intake body when I removed it. I do not think there is reason for concern right now but I do plan on owning the car for a long time. I guess I can check teh price of a new intake body.

 

[lsbit]

What would happen if the VC was not on a securely as it should be how would the engine run? Or would there be not impact at all other than leakage.

You would leak oil back into the plugs too. All depends on where they aren't secure. If it was an old Ford 302, you wouldn't have much of a problem. OHC engines are a different story.

I figured those vent tubes you mention were for PCV.

 

[eL eS]

I ordered a PCV to replace when I did my VC. The part no. is even listed on alldata.com but I could not find the part when i had everything apart. I did not have the time to keep searching so it is on my parts shelf for the moment.

 

[JohnnyBz00LS]

Correct, the VC vent tubes are part of the PCV (positive crankcase ventilation) system. It re-circulates blow-by gasses back into the engine to reduce emissions. It does NOT help MPG, as your engine is burning it's own pollution, which is NOT good for efficiency. However, your crankcase must be ventilated (preferrably w/ a small vacuum which IS provided by PCV) to help keep the seals working, otherwise pressure will build up and blow oil out the crankshaft seals.

PCV is probably one of the oldest forms of emissions control, dates back to the mid 60s IIRC.

 

[eL eS]

Correct, the VC vent tubes are part of the PCV (positive crankcase ventilation) system. It re-circulates blow-by gasses back into the engine to reduce emissions. It does NOT help MPG, as your engine is burning it's own pollution, which is NOT good for efficiency. However, your crankcase must be ventilated (preferrably w/ a small vacuum which IS provided by PCV) to help keep the seals working, otherwise pressure will build up and blow oil out the crankshaft seals.

PCV is probably one of the oldest forms of emissions control, dates back to the mid 60s IIRC.

So if I rerouted teh VC vent tube elsewhere would that harm or hender the car in any way?

 

[JohnnyBz00LS]

So if I rerouted teh VC vent tube elsewhere would that harm or hender the car in any way?

I'd recommend leaving it as designed. To do otherwise would risk leakage at the seals, and would certainly cause you to fail emissions testing (not to mention the PCM will probably throw some codes). There really is nothing to gain by re-routing it, but maybe a small fraction of an MPG. In fact, some race engines use vacuum pumps to evacuate the crankcase (moreso than what manifold vacuum can do) and results in increased power.

 

[eL eS]

I'd recommend leaving it as designed. To do otherwise would risk leakage at the seals, and would certainly cause you to fail emissions testing (not to mention the PCM will probably throw some codes). There really is nothing to gain by re-routing it, but maybe a small fraction of an MPG. In fact, some race engines use vacuum pumps to evacuate the crankcase (moreso than what manifold vacuum can do) and results in increased power.

roger-wilco

 

[kleetus]

The only other problem you may run into, depending on how loose the VC's are is dirt being sucked in from the PCV system. Obviously, it's best to keep most things tight, where they started out.

 

[eL eS]

i forgot to add that I found some of the bolts a bit loose when I was performing the maintenance. Apparently when the dealer did the job the first time they did not tighten them all abck down. It wasn't flapping loose but the center bolts required little to no effort to free. In fact a few were loose enoough for me to spin out by hand.

 

[lsbit]

i forgot to add that I found some of the bolts a bit loose when I was performing the maintenance. Apparently when the dealer did the job the first time they did not tighten them all abck down. It wasn't flapping loose but the center bolts required little to no effort to free. In fact a few were loose enoough for me to spin out by hand.

I guess they didn't re-torque them, as you normally start from the center. I always check all the way around again after initial install. That was probably too much work for them. I have had intake bolts come out that way and never had a leak. I always re-torque intake bolts a few times. Well...on a 302, which I seem to always have around in one of my cars.

 

[eL eS]

I guess they didn't re-torque them, as you normally start from the center. I always check all the way around again after initial install. That was probably too much work for them. I have had intake bolts come out that way and never had a leak. I always re-torque intake bolts a few times. Well...on a 302, which I seem to always have around in one of my cars.

I do the same thing becasue as you well know applying torque to the adjacent bolts most of the times puts play on the bolt you did before it. I'd rather do the jobs myself just so I know what was done. Why pay them to screw it up when I can do it for free