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Old 06-14-2018, 10:46 AM   #1
silver sl
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Default Vacuum Leak?

I have a 2000 sl1 and I have a vacuum leak somewhere. What are the most common and best way to find them?

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Old 06-14-2018, 12:53 PM   #2
Dsaturn
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2001 L-Series 2.2L Sedan
Default Re: Vacuum Leak?

Spray carb cleaner on all vac hoses and where they connect while the engine is running. Listen for the engine to bog down from the spray.

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Old 06-14-2018, 12:57 PM   #3
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Default Re: Vacuum Leak?

I always found the engine to surge, not bog down with carb cleaner....its like extra fuel.

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Old 06-14-2018, 01:41 PM   #4
Cheyne
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Default Re: Vacuum Leak?

It's likely an intake manifold leak with your model.

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Old 06-14-2018, 02:02 PM   #5
silver sl
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Default Re: Vacuum Leak?

just changed that. It idles better now but the motor still revs up a bit when I push the clutch in while driving. And the motor sounds different at higher rpms, like its working harder than before, doesnt sound as smooth as before the intake gasket was changed

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Old 06-14-2018, 02:23 PM   #6
DonP1
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Default Re: Vacuum Leak?

Did you change the gasket or the entire manifold? The plastic intake manifolds on 2000 - 2002 are know to crack.

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Old 06-14-2018, 04:12 PM   #7
Dsaturn
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Default Re: Vacuum Leak?

Quote:
Originally Posted by toggenburg View Post
I always found the engine to surge, not bog down with carb cleaner....its like extra fuel.
You are correct if you use flammable carb cleaner. Non flammable drops rpms. For safety reasons non flammable should be used. Of course if a person is old school and a little nutty they use starting fluid. (Very dangerous) Then the engine revs high.

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Old 06-14-2018, 11:51 PM   #8
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Default Re: Vacuum Leak?

Quote:
Originally Posted by DonP1 View Post
Did you change the gasket or the entire manifold? The plastic intake manifolds on 2000 - 2002 are know to crack.

The plastic manifolds are just on the DOHC.

...
97 SW2 5-Sp 273k -mine
02 SC2 5-Sp 67k - best friend's

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Old 06-15-2018, 05:38 AM   #9
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Default Re: Vacuum Leak?

Quote:
Of course if a person is old school and a little nutty they use starting fluid.
That would be me! Haven't done it in a long time though. The 80's cars had a lot of vacuum junk and leaks could be an issue.

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Engine, subframe, diff pin mod, brake lines, headliner, alternator, and so on!
'98 SC2, 5SP bought 2018

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Old 06-15-2018, 08:52 AM   #10
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Default Re: Vacuum Leak?

Quote:
Originally Posted by Greg1 View Post
The plastic manifolds are just on the DOHC.
Thanks I did not know that. I'm a bit of a DOHC snob LOL!

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