quick vacuum question

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Jun 29, 2021 | 06:43 AM

sb66

Thread Starter

Burning Brakes

Joined: Jun 2016

Posts: 1,058

Likes: 108

From: Ohio

quick vacuum question

ok i attached a vac gauge and found at idle/neutral (manual tranny - '85 with 70K miles). at 149* rpm at 670-700 the vac showed was between 18-19 when hooked to the port marked in red

which at least on the gauge says "normal". I am not sure if that is or not - does any of that sound right?

thanks

Jun 29, 2021 | 07:56 AM

Red86Z51

Safety Car

Joined: Mar 2003

Posts: 3,583

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From: Indianapolis IN

Finalist 2020 C4 of the Year - Unmodified

C4 of Year Finalist (stock) 2019

Rest easy, your vacuum looks good.

Jun 29, 2021 | 07:58 AM

sb66

Thread Starter

Burning Brakes

Joined: Jun 2016

Posts: 1,058

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From: Ohio

excellent - thanks - sigh of relief . . .

Jun 29, 2021 | 08:03 AM

FostersPerformance

Safety Car

Joined: Jul 2003

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From: Saratoga Springs NY

2024 C4 of the Year Finalist - Modified

2022 C4 of the Year Finalist - Modified

Besides the # at idle you also are looking for a steady reading. Not bouncing around or fluttering or anything else . A vacuum gauge will tell you alot if you can read it.
If you image search for "vacuum gauge chart" you will see how that tool is very useful.

Jun 29, 2021 | 09:13 AM

sb66

Thread Starter

Burning Brakes

Joined: Jun 2016

Posts: 1,058

Likes: 108

From: Ohio

thanks - i will do that now - mine did have a little flutter to it but at least it stayed in that zone

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