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Offline Shimy87

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vacuum block
« on: September 18 2013, 02:23:48 PM »
During my latest problem solving session I discovered another potential issue. It appears I have a slight leak in or around the vacuum block? I cant see any obvious issue but if I hold my hand over it the slight hissing I hear is muffled. It appears that the plastic block may have a slight bow in it??? Maybe its leaking at the seal to the TB because of this. Anyone run into this before?
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87 GN, K&N cold air, gutted cat, TT 5.7 chip, AFPR, 340 Walbro w/ hotwire, 60 LBS injectors, 981 valve springs, 206/206 Cam, RJC Powerplate, LS1 MAF & translator, Vacuum brakes, Hellwig rear sway bar, Energy suspension poly bushings, Razors Alky, Pypes exhaust, 5931 turbo, CK9.5 converter

Offline phil_long

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Re: vacuum block
« Reply #1 on: September 18 2013, 03:38:34 PM »
the piece sitting under vacuum block is cracked... :O im still scooting around, although that will be my next investment

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Offline Shimy87

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Re: vacuum block
« Reply #2 on: September 18 2013, 03:43:45 PM »
the gasket??
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87 GN, K&N cold air, gutted cat, TT 5.7 chip, AFPR, 340 Walbro w/ hotwire, 60 LBS injectors, 981 valve springs, 206/206 Cam, RJC Powerplate, LS1 MAF & translator, Vacuum brakes, Hellwig rear sway bar, Energy suspension poly bushings, Razors Alky, Pypes exhaust, 5931 turbo, CK9.5 converter

Offline Steve Wood

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Re: vacuum block
« Reply #3 on: September 18 2013, 04:46:48 PM »
sounds like the gasket to me...

is it snugged down properly?

Spray a little carb cleaner around it and see if the idle changes.

Take it off, put a thin smear of rtv on the base, clean off the top of the plenum, wait 20 minutes, and then bolt it down
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Steve Wood

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A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline Shimy87

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Re: vacuum block
« Reply #4 on: September 18 2013, 04:56:09 PM »
Thanks, i'll give it a try  :cheers:
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87 GN, K&N cold air, gutted cat, TT 5.7 chip, AFPR, 340 Walbro w/ hotwire, 60 LBS injectors, 981 valve springs, 206/206 Cam, RJC Powerplate, LS1 MAF & translator, Vacuum brakes, Hellwig rear sway bar, Energy suspension poly bushings, Razors Alky, Pypes exhaust, 5931 turbo, CK9.5 converter

Offline earlbrown

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Re: vacuum block
« Reply #5 on: September 18 2013, 08:32:27 PM »
Years ago I chased that link and couldn't get it to seal to save my life.  I finally got an alum block and solved the problem.
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'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline Shimy87

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Re: vacuum block
« Reply #6 on: September 19 2013, 05:03:52 PM »
I saw those but hope I dont have to spend the $40
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87 GN, K&N cold air, gutted cat, TT 5.7 chip, AFPR, 340 Walbro w/ hotwire, 60 LBS injectors, 981 valve springs, 206/206 Cam, RJC Powerplate, LS1 MAF & translator, Vacuum brakes, Hellwig rear sway bar, Energy suspension poly bushings, Razors Alky, Pypes exhaust, 5931 turbo, CK9.5 converter

Offline Shimy87

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Re: vacuum block
« Reply #7 on: September 19 2013, 08:00:19 PM »
Well $40 spent, was going to replace the little hose pieces when I did this and of course the frickin plastic nipple broke off on the end one  :013: :013: :013: 
 
Its how it always goes with this dam car!
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87 GN, K&N cold air, gutted cat, TT 5.7 chip, AFPR, 340 Walbro w/ hotwire, 60 LBS injectors, 981 valve springs, 206/206 Cam, RJC Powerplate, LS1 MAF & translator, Vacuum brakes, Hellwig rear sway bar, Energy suspension poly bushings, Razors Alky, Pypes exhaust, 5931 turbo, CK9.5 converter

Offline earlbrown

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Re: vacuum block
« Reply #8 on: September 20 2013, 01:07:13 PM »
I didn't want to spend the money either...    The car kinda insisted!



On the upside that's a part that is a permanent fix.
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'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock
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