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GOT A VACUUM LEAK HOW DO I DETECTE IT? - Suburban Chevrolet Cars & Trucks

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Choke or carb cleaner arooun intake if stumble or increased idle pin point spray to determine leak

Posted on Dec 14, 2012


Depends on where it is

An Evap Smoke Machine is the best
& quickest way to find leaks

Posted on Dec 12, 2012


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Vacuum leak

Symptoms of engine vacuum leak: The problems that arise from an engine vacuum leak can be more than annoying. Idle speed that is way too fast is one of the difficulties, and stalling is another. Confirmation of an engine vacuum leak can be a very loud hissing sound coming from the engine area.

Problems Caused By An Engine Vacuum Leak - Pro Car Mechanics

Dec 15, 2016 | Cars & Trucks

1 Answer

Could a vacuum leak cause right bank #1and bank 2 to run lean?

Running lean indicates too much air (like a vacuum line leak or an intake manifold leak) or not enough gas (like low fuel pressure or clogged injectors)

I would check the fuel pressure. Autozone and others will loan or rent fuel pressure testers. If fuel pressure is correct, purchase a vacuum gauge for about $15-$20, and hook it to a manifold vacuum tap. If your vacuum reading at idle is less than 17-22 inches vacuum and steady, then you have a vacuum leak. It is a great diagnostic tool-tells you quick if there is an air leak somewhere. Here is a link about using a vacuum gauge:

If you vacuum reading is good, check the injectors.

Jan 28, 2015 | Cars & Trucks

1 Answer

2003 trailblazer, 4.2..... No vacuum to the fuel pressure regulator. Why?

vacuum leak at intake or maybe to brake vacuum booster. Usually able to find with carb cleaner. Once the carb cleaner enters at vacuum leak it will raise the rpm's then you know where to look for the vacuum leak.

Dec 21, 2014 | 2003 Chevrolet TrailBlazer

2 Answers

Engine stalls essesive gas consumption

When does it stall? Give me some more details. But in the mean time Im gonna guess vacuum leak. Turn the car on and spray carb cleaner at the vacuum hoses. If you hear the engine wind up you know there is a vacuum leak in that spot. For your engine to stall and take a lot of gas its gotta be a big vacuum leak. But it might not even be a vacuum leak but its something to check into. It would be a cheap and easy fix if it is just a leak! Give me some more details if its not a vacuum leak. Good luck!

Sep 13, 2013 | 2002 Lincoln Navigator

1 Answer

My 1998 expedition with the 5.4 triton runs rough at idle but clears up when driveing down road I know I have a manifold leak and the previous owner said it was a coil pack, however after I had advanced...

If you have a manifold leak that will cause a MASSIVE vacuum leak and make it run rough at idle only. Look at your short term fuel trims with a scanner, if they are way negative you have a vacuum leak. Fix the intake manifold leak and that will fix your problem.

Oct 06, 2011 | 1998 Ford Expedition

1 Answer

Why would my heater change over to defrost when i excelerate

You have a vacuum leak -- acceleration drops vacuum in system -- vacuum motors which operate heating system doors loose vacuum and close.

Trace vacuum hoses and inspect for loose connections, cracked hoses, etc. Often the leak (hissing) can be heard. The leak could be in any number of places. If you can't find the leak yourself, best bet is to take it to a shop.

More info, let me know.


Feb 16, 2011 | 1988 Dodge Aries

1 Answer

I hear big vacuum leak on 2001 elantra not any hoses

If you can "hear" a vacuum leak then the performance of the car would be greatly affected and the engine would idle much higher than normal. Normal idle speed is around 800-1000 rpm, Check you dash tachometer. If you have a vacuum leak the idle will go up to 1200-1500 rpm.
There are lots of places beside hoses that can leak vacuum such as the EGR valve or around intake manifold. But check that rpm's first to confirm what you are hearing is a vacuum leak.
You can also purchase a vacuum gauge form your local auto parts store. they cost around $20.00+. The gauge should read a steady 15-20", if less, then a leak is indicated

Feb 06, 2011 | 2001 Hyundai Elantra

1 Answer

After starting, idle will not drop below 1500 rpm engine races. apparent vacuum leak. how do I locate this leak?

Easiest way to check for a vacuum leak is to spray some carb cleaner where you suspect a leak and engine idle will change.

I suspect your problem is with the IAC. Try changing if you can't find a vacuum leak. Cheaper to check for leak first.

Oct 24, 2010 | 1995 Ford Mustang

1 Answer

Vacuum Leak, the car jurks sometimes while riding.

When the problem is a vacuum leak you also have troubles at idle.
The vacuum can be tested using an hand tool gauge like this.
Vacuum/Fuel Pump Tester Kit
Once you find the leak, replace the leaking part.
Often it is easy to find the leak at a glance, as it is hissing or you notice the air out from the leak. Other techniques are pumping smoke inside vacuum or spreading soapy water on vacuum lines.
check also the EGR valve.
If you need the vacuum system diagram purchase a repair manual like this one : 2000 Cadillac SeVille STS Repair Manual on CDROM .
Here also a free tutorial on vacuum problems.

Jul 14, 2009 | 2000 Cadillac Seville

2 Answers

How do you clean the EGR valve on a 99' Honda Civic?

Pull vacuum on egr valve with engine idling and see if engine stumbles and tries to die until vacuum is released. If this DOES NOT happen the egr exhaust passage is plugged will need to remove egr valve assembly and remove carbon from passage into cylinder head.

Mar 29, 2009 | 1999 Honda Civic

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