C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Help under the hood

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Old Aug 9, 2005 | 09:13 PM
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nw92vert's Avatar
nw92vert
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Joined: Jul 2004
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From: Everett WA
Default Help under the hood

There's a vacuum hose, 7/32, routed to the firewall, or a box on the firewall, from a round module above the battery on the driver side. It appears to connect inside that box. Can this hose connection be accessed easily from under the hood or do I have to go under the dash? Is it the ASR function that 'pushes' back on the gas peddle when there's slippage detected? There's another 5/32 vacuum hose that comes off the bottom of that same round module that I've just replaced.

The hose is deteriorating and I want to replace it but don't want to waste time trying from inside to get to the hose connection when it can be done more easily from the other side of the firewall, or visa versa.

Thanks in advance.

- Glenn
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Old Aug 10, 2005 | 12:05 AM
  #2  
Hotred94's Avatar
Hotred94
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From: Syracuse Utah
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These hoses are part of the cruise control. The larger hose goes to a fitting on the brake pedal and brakes the cruise control vacuum when you push on the brakes. The other hose goes to a vacuum source.

Yes, you have to remove the lower dash to work on this hose unless you are a contorsionist. It's in a very awkward location. I also removed the battery to get right in there on the engine side. Cut the hose anywhere you want to get it out; it goes through a rubber fitting in the firewall. I cut the hose right at the brake fitting, then rotated the fitting down (it rotates easily) and slit the hose open to remove it.

To get the new hose in, wrap the end of the hose in duct tape making a leader about 6 inches longer than the hose, then thread it through the firewall fitting and pull it through the other side like threading a needle. It helps to "lube" the tube up with vaseline or something.

Hope this helps.
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