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Author Topic: Vacuum Leak  (Read 2685 times)

Offline Unofficial

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Vacuum Leak
« on: October 20, 2008, 10:21:17 pm »
It seems like almost ever since I put in my rebuilt 350, I've had this hissing sound. I replaced the valve covers, so my PCV setup got changed, and now I have a big unused nipple coming out of the TBI spacer ring that the air filter sits on. I got a new spacer without the nipple, and I still have that really bad hissing. I figured I must have some kind of vacuum leak, but I don't know where to start. Is there any special technique or do I just look at every single vacuum line?

Also, I've noticed that sometimes, if I take off from a stop sign or a light, I'll lose all power and it will feel like I'm taking off in too high of a gear. The engine bogs down and I could floor it and it would just chug. Do you guys think a vacuum leak would be associated with this problem, it's getting pretty annoying. Thanks for any help.  :)
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1987 Custom Deluxe R10
350 TBI bored .040 over
700r4 with a Transgo shift kit
MSD ignition
Long tube headers w/ true duals
Upgraded sound system w/ subwoofer

Offline VileZambonie

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Re: Vacuum Leak
« Reply #1 on: October 20, 2008, 10:24:57 pm »
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline gerardo0367

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Re: Vacuum Leak
« Reply #2 on: October 20, 2008, 10:45:20 pm »
Check the butterfly shafts on the base of the carb i had one that leaked and it had a hissing sound also from worn shafts and or bushings later
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All Man wheres my wallet and my keys I wont try that again
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