Vacuum Problem - Help!

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Aug 14, 2003 | 06:39 PM

flynhi

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From: Austin TX

Vacuum Problem - Help!

Doing final checks before buttoning up the dash on my 71 and I have a vacuum problem.
After start when vacuum comes up, both wiper door and headlights come up. Each will go down when its respective override switch is opened.
What's up with this?

Aug 14, 2003 | 07:00 PM

87bob

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From: Franklin IN

Re: Vacuum Problem - Help! (flynhi)

I think you may have a hoses reversed that is why the come up.

Aug 14, 2003 | 07:37 PM

wayne_69_427

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From: High Point, NC

Re: Vacuum Problem - Help! (87bob)

I think 87bob is on the right track

Aug 14, 2003 | 07:53 PM

vettfixr

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From: Sewell NJ

Re: Vacuum Problem - Help! (87bob)

Quote:

I think you may have a hoses reversed that is why the come up.

:iagree:

Aug 14, 2003 | 07:58 PM

flynhi

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From: Austin TX

Re: Vacuum Problem - Help! (87bob)

87bob,
Any idea which hoses could be switched that woould affect both systems?

Aug 15, 2003 | 01:01 AM

flynhi

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From: Austin TX

Re: Vacuum Problem - Help! (flynhi)

ttt

Aug 15, 2003 | 03:58 AM

jerryjfunk

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From: Pittsburgh PA

Re: Vacuum Problem - Help! (flynhi)

Which port do you run your headlights off of?

Aug 15, 2003 | 08:52 AM

flynhi

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From: Austin TX

Re: Vacuum Problem - Help! (jerryjfunk)

Primary vacuum is off the plenum of the TPI. Then to the vacuum reservoir under the driver side fender.
All plumbing forward of the res is as per AIM. I'm tracing plumbing on drivers side of firewall. Connections at the check valve on the back of the tach are suspect.
Any ideas on what could be wrong in this area that would cause my problem?