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Old 06-19-2003, 03:13 PM   #1 (permalink)
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Vacuum

One question, for those of you that have done the non-ABS conversion, where do you pull the vacuum from?
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Old 06-19-2003, 06:14 PM   #2 (permalink)
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On the plenum above the manifold. There should be a threaded fitting with a plug torqued into it. Pull the fitting, measure the thread size/pitch and find a fitting with a nipple on it the same diameter as that on your M/C.
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Old 06-19-2003, 06:30 PM   #3 (permalink)
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Nice, thanks. The rest of my parts should be in tomorrow and I'm hoping to have it done this weekend. I'm running all new brake lines except for the hard lines at the rear and I figure it will take me some time to get everything bent and put together.

I found some adapters to put into the MC that will allow me to use standard brake pipe to the stainless lines so if I have an uh-oh sometime it will make replacing the line a whole lot easier.

I'll post a report with all my findings.
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Old 06-20-2003, 10:22 PM   #4 (permalink)
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I've felt around on the back of the plenum and manifold by the stepper motor and I cannot find it. Anyone got a more exact location?

This is 4.2L 93 LWB and I wonder if they left that fitting out?

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Old 06-21-2003, 04:41 AM   #5 (permalink)
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It is on the right side of the plenum, near the back. It should be the same port used for your ABS Booster.

On that side of the plenum, there should be three threaded ports. The rear one is usually used for brake vacuum and has a nifty one way check valve. The next one forward is used for the evaporative emissions canister and the forward-most one is usually plugged.

Peace,
Paul
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Old 06-21-2003, 08:47 AM   #6 (permalink)
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On my setup there was no vacuum line, this port still has the plug in it. It looks like I won't have this done this weekend, but I should have it done on tuesday or wedensday. Thanks!!!
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Old 06-21-2003, 09:57 AM   #7 (permalink)
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Quote:
Originally posted by cardboardkiller
On my setup there was no vacuum line, this port still has the plug in it. It looks like I won't have this done this weekend, but I should have it done on tuesday or wedensday. Thanks!!!

Like I said...pull the plug, measure the threads, and find a fitting...
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Old 06-21-2003, 12:19 PM   #8 (permalink)
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Thanks, I figured it out. It just kind of spooked me to pull that plug and have a couple of drips of gas come out. Now I have to jerry rig up a fitting. I was actually looking at the very rear of the plenum, instead of on the passenger side.

Last edited by cardboardkiller; 06-21-2003 at 12:23 PM.
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