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View Full Version : Intake Manifold Vacuum leak


Ridoan
06-09-2012, 03:48 PM
My car starts but it takes like two or three tries before it does. Then the other day I popped the hood after I turned it off and heard a hissing noise. So I think I have an intake manifold vacuum leak. Has anyone had an issue like this before? Any tips on how to fix it?
83CelWA
06-09-2012, 04:17 PM
Find the leak and seal it.....
4SFED
06-09-2012, 04:42 PM
Has anyone had an issue like this before? Any tips on how to fix it?
Vacuum leak is probably the most common 'issue' you'll see with these cars that are getting older and rubber cracking, plastic getting brittle and seals getting unsealed.
So quick answer to first question is yes. Quick answer to second question is see above. If you can hear it then it should be pretty easy to find and fix.
Ridoan
06-09-2012, 08:18 PM
Find the leak and seal it.....

I know that's how to fix it. I was wondering if anyone had any tips on how to find it. My fault for asking. I guess I should have know better.
4SFED
06-09-2012, 08:51 PM
first do a visual. Pinch off hoses one by one and if the rpm changes when one is pinched off then chances are it has a leak. Spray carb cleaner around while the engine is running. Around the intake manifold and the throttle body and the intake hoses going to the AFM. If the rpm changes, it usually indicates a vacuum leak in the area that your spraying in.
4SFED
06-09-2012, 08:55 PM
Sometimes we forget that what we might consider as common knowledge may not be so common.
Rich64N
06-10-2012, 01:26 AM
+1 on 4SFED above. And long term vacuum leaks lead to a lean running condition, which then leads to burnt valves and low compression.
Ridoan
06-10-2012, 08:17 AM
Thanks. That's the kind of stuff I was looking for earlier. I'm not a rock scientist or a mechanic. I'm just a regular guy who has a celica supra who's trying to do his best to restore it. It's comments like the ones earlier that make me want to give up on this site all together
bahlorm
06-10-2012, 09:43 AM
Agree with the above message from 4sfed. Another method I have heard of that works is taking a cigarette or cigar, unplug a vacuum line and puff smoke inside of it. I have not tested this but heard it works well. But I would personally go with some carb cleaner and listen for any difference in the engine.