[DML] Re: Engine vacuum problems?
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[DML] Re: Engine vacuum problems?

Pul the intake manifold. One of the "O" rings to one of the holes in
the cylinder head is not sealing. You should be able to get 18" at
idle. The other possability is a leak in the large hose going to the
vacuum booster for the brakes. Pull it off and plug it and then see if
the vacuum gets any higher. It is the large hose coming off the front
of the intake on the right side. The air tube should be snug, you can
see it from inside the venturi. Make sure the "O" ring is sealing and
the tube is all the way in. Use a bit of silicon on it and the "O"
rings on the intake manifold to cylinder head. Make sure the intake
manifold is properly positioned and sealing fully when tightened up.
David Teitelbaum
vin 10757

-- In dmcnews@xxxxxxxxxxxxxxx, "stainlessilusion" <5n-@xxxx> wrote:
> At first, I didn't realize I had forgotten to hook up this vacuum 
> line and so the barb was left open sucking in the air. When I 
> finally noticed this I hooked the line back up and had the problems 
> I described in my previous post; so I then removed the line and 
> capped off the barb. Other then the one ridiculously huge leak I 
> have on one side- the exhaust sounds like the engine is running a 
> bit rich. For checking the vacuum: I hooked up my gauge to the RH 
> rear barb of the intake, have the LF side capped, the cold start 
> barbs running to themselves and finally the throttle body barb 
> capped. I then switched between LH and RH sides and experimented 
> uncapping/hooking up lines to make sure the lines weren't leaking. 
> Checking the vacuum and my meter read about 16.5 in Hg; when I first 
> started up the gauge went from 14-16 with the slight idle seek for 
> about 10 seconds until it steadied. If I hold about 1,500 RPM it 
> will jump to 18 in Hg, let go and there is the normal sudden 
> increase in vacuum to about 20-and then back down to 16.5. So I'm 
> guessing this means I have a leak somewhere? Now, I know that my "W" 
> air horn to intake gaskets aren't leaking, as well as the O rings 
> going to the throttle body. I also know the joint between the 
> throttle body and metering unit isn't leaking. All my engine's O 
> rings are brand new and the vacuum lines are silicone-were inspected 
> for any cuts and they are fine. The lines that also slide onto a 
> connection easily (t-body barb) have a clamp to tighten the lines 
> onto their barbs so they don't leak. My sensor plate sits at the 
> correct height and doesn't touch any of the sides-I verified this by 
> pushing it down, and with the throttle body removed; pushing it up 
> to hit the stop. The frequency valve is buzzing constantly naturally 
> (not forced with a bypassed full throttle switch) and the O2 sensor 
> is brand new. The brass tube slides easily into the base of the 
> metering unit; is this supposed to be, or is it supposed to be snug? 
> Other then that, the only thing left would be the intake to head O 
> rings right? Both the hoses for the idle motor are new and snug as 
> well as clamped down. Am I missing somewhere else? Thanks for the 
> help guys -----Dani B. #5003

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