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



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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