Is a clamp needed? vaccum line?

[edhCO]

I attached this hose clamp to the top of the silver piece in the tube, does there need to be another attachment at the other side ( a directional air valve it seems,,, I apppologize, don't know what to call it.)

clamping it really helped my idle and a strange behavior with my brakes. Brake pedal depressed would increase engine rpm otherwise it was such a rough idle.. hard to keep running.

A threaded hose clamp does not suit the situation, the rubber is folded down- what clamp to use, if any? Anyone have a suggestion or pic of this on their rig?

Thanks in advance.

 

[Poser]

If the PCV valve grommet in the side cover is deteriorated, it could be causing a vacuum leak, which by the sounds of things, you were experiencing before you put the clamp on the hose.



So after you installed this hose clamp on the PCV valve, all of your idle and brake issues have gone away?

 

[edhCO]

Yes- So it seems, The idle is not as rough, I do have a bout of it stalling or I should say failing to idle occasionally. But the brake is quite apparent, There was an associated click with the in-cab light for the brake that was the threshold for the idle to increase.

The PCV is pretty loose on the bottom side, only takes a good push to one side before it comes out- just doesn't seem right. Please let me know if I am wrong.

Clamp it? or replace the grommet?

 

[MDH33]

looks like it might not be an OEM PCV grommet. It should fit Very Tight and thus doesn't need a clamp of any kind. Order a new one from CDan or a dealer and skip the auto parts store. Get a new PCV valve while you're at it. They're both cheap and good preventative maintenance.

What year is your 40??

 

[Poser]

But the brake is quite apparent, There was an associated click with the in-cab light for the brake that was the threshold for the idle to increase.

Please expand on this.


Pick up an OEM PCV valve and grommet.

 

[edhCO]

It is a '76

"But the brake is quite apparent, There was an associated click with the in-cab light for the brake that was the threshold for the idle to increase"

Expanded thought- So When I depressed the brake pedal, in the first part of the pedal travel there is a sound... An electrical "Click" Which I am tying to the light at the left side of the dash denoting the brakes, Prob. for wiring for trailer- or maybe they all have this. When the pedal continues in travel (depressed more) the idle speed would increase with direct coreelation to pressure given to pedal, This was actually quite handy as at the time the rig would not idle with out dying. I would have to hurry up to stop- Quite an irony. ha. ... It doesnt make much sense to me, but the only thing I manipulated was the PCV valve. The apparent difference.. now there is no coorelation with the pedal being depressed and idle speed.

Seemed like my idle was vaccum related- which is why I went on the hunt.

Clear as mud? Let me know if you have any other thoughts or reasons why this occoured.

 

[2mbb]

Your hose clamp above the PCV valve must have sealed a vacuum leak that was bypassing the PCV valve. Although a tight seal between the PCV valve and the engine block (at the rubber grommet) is a good thing for crankcase ventilation and containing emissions, it shouldn't effect how your truck runs, especially at idle. The PCV valve is designed to restrict flow at idle (high manifold vacuum) and not restrict flow under high load (low manifold vacuum). having a leak that bypassed the PCV valve at vacuum was letting too much air into the intake manifold and leaning out your idle fuel mixture. If all the air goes through the PCV valve, it shouldn't matter much whether that air comes from inside or outside of the engine block.

 

[066wally]

The click you hear is the brake light switch that is mounted at the top of the pedal and is most likely totally unrelated to the vacuum issues you have/had. When the switch is opened the brake lights come on (and the one in the dash lights up) and coincidentally it opens up at about the same time the brakes begin to be applied. Yeah, they all have it.