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Finding vacuum leak

How do I fine a vacuum leak

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Spray some water with the bottle spray

Posted on May 05, 2014

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My prizm hesitates when pushing the peddle. Then it takes off. Not carburetor.

Is the check engine light on ? Sounds like it mite have a vacuum leak. Check all vacuum hoses , pinch off the bigger vacuum hose going to the power brake booster . Spray around the engine with spray carb. cleaner. I 'll send a link on finding vacuum leaks by Eric the car guy . Watch all his videos . a picture is worth a thousand words. These computer controlled cars get problems that need to be tested with scan tools and electrical testing equipment , such as lab scopes and dvoms . Ask Eric he has videos for all car problems How To Find Vacuum Leak EricTheCarGuy and there are other posted repair videos .

Dec 23, 2014 | Cars & Trucks

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Why cant I find vacuum leak/

Waterboard it!

No, really. Get a spray bottle that can spray out a fine mist, and fill it with water. Start the engine and let it idle. Now wet down all suspected areas-vacuum hoses and fittings, intake manifold gaskets, pcv hose, etc.. Special attention to the intake. Wet it down good around the intake sealing area.
If you have a vacuum leak, the water will get sucked into the intake, and you will hear the engine idle change pitch, it may stumble and the idle will drop.
If no leaks found, maybe was something else. Check fuel pressure for one.

Aug 31, 2014 | 2004 Kia Sorento

1 Answer

Dodge ram dies reverse

You may have a vacuum leak, which is more apparent when you lean on the brake pedal hard. It won't be easy to find vacuum leak, but a can of WD40 sprayed around suspected areas could find leak when idle changes.

Jan 06, 2014 | Cars & Trucks

1 Answer

Reduced engine power and traction control disabled. replaced mass air flow sensor and throttle body position sensor. still won't start or it will stall when driving. sometimes it will run fine. it seems...

Check for a vacuum leaks use a air pressure gauge most come with instructions. It may be a failed gasket or airline. If it is a Vacuum leak usually the mechanic has to use a smoke machine to find it unless it is very obvious. Try plugging vacuum line for the power brakes if the car has a vacuum assisted brake instead of a hydraulic one. Sometimes the diaphragm fails in the power brakes unit or the seals leak. Remember when you test this there will be no brake assist and In some cars you have to stand on the brakes for the car to stop. .

Jan 02, 2014 | Pontiac Cars & Trucks

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I just got this blazer and noticed that it idles rough what could cause this?

idles rough but fine in a higher rpm. you might have a vacuum leak. to find a vacuum leak i use propane to pinpoint the orign of the leak. when the leak sucks in the propane the engle idle increases. thus you found your vacuum leak

Feb 16, 2011 | 2002 Chevrolet Blazer

3 Answers

My 96 mustang gt 4.6L automatic is running like

vacuum leak. it wiil cause a misfire code to be set because too lean from vacuum leak.

Feb 14, 2010 | 1996 Ford Mustang

1 Answer


In the past we have used starting fluid to find vacuum leaks. Start the engine, let it idle. Spray quick shots of starting fluid at your vacuum lines in isolated areas. When the starting fluid find the vacuum leak the engine will react to it... usually by going up in rpm. Depending on your engine computer, it may stall the engine. Either way you will find your vacuum leak. Get starting fluid or "ether" at Autozone or O'Reilly.

Dec 01, 2009 | 1999 Volvo S80

2 Answers

When I shift to 4 wheel drive the indicator light comes on but the front wheels do not lock. If you manually lock the front hubs the 4 wheels lock and work fine. what is the fix for this problem.

The autolocking hubs are vacuum actuated. If they don't lock then you most likely have a vacuum leak somewhere. This usually occurs where the vacuum line (black rubber hose) attaches to the knuckle on the inside of each front wheel. These hoses get dry and crack. Another simptom of this leak is the AC changing from front vents to defrost vents when you switch to 4x4 so check for this. You could also have a vacuum leak in the hub diaphragm or one of the orings in the hub could be cracked or broken. If you cannot find a vacuum leak then the vacuum solonoid valve may be bad.

Aug 07, 2009 | 2003 Ford F250 Super Duty Crew Cab

1 Answer

97 jeep wrangler 2.5 running lean

check fuel pressure and check exhaust for leaks. exhaust leaks caqn play with the o2 sensor readings

Sep 15, 2008 | 1997 Jeep Wrangler

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