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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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Posted on Jan 02, 2017

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20 valve toyota RXI idles fine when accelerates it begins to backfire.What can cause it.


Likely a vacuum leak from a disconnected hose, misconnected hose, or deteriorated hose. Using the vacuum diagram decal, trace and inspect each vacuum line under the hood one at a time. Once you find a bad vacuum line, continue to trace the lines until you are sure all have been inspected.

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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

1 Answer

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

Vacuum Issue on 2006 Lincoln Zephyr


Problem Description and Possible Solution
A vacuum leak from the PCV grommet. A vacuum leak can cause the Check Engine Light to illuminate. The molded rubber hose connections may crack and collapse, causing the vehicle to run roughly. A damaged PCV hose will require replacement.

Problem Data
Average mileage: 137,860 (98,300–203,000)
17 model years affected: 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007

Jan 21, 2018 | Lincoln Cars & Trucks

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

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

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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