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Vacuum leaks i cant find it

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Got codes? Spray 2+2 around the intake, if the idle changes as you go over a certain area, that's where the leak is.

Posted on Nov 24, 2013

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Could i have an engine vacuum leak or any vacuum leak? my engine wont start after installing a new high rise intake and new holley street avenger 670 carb.


Yes.
The spacer could be leaking inside - the spacer should match the gasket for the base of the carb and the intake.

Mar 08, 2015 | 1968 Chevrolet Corvette 327

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 leak


you are looking to see if vacuum lines on the ends. are easy to pull off if so then will be leaking. cut the ends off then refit .

Dec 15, 2013 | 1997 GMC Safari

1 Answer

GETTING CODE 25 ON DOGE NEON 1995 FOR VACUUM LEAK AT IDLE CANT FIND A LEAK HOW CAN I FIX ISSUE?


Start the engine and with a spray bottle with water in it, spray water on the vacuum pipes until the engine stumbles or shuts down. I like to use propane and see where the engine raves high, thats where the vacuum leak is. Good luck.

Jun 23, 2012 | 1995 Dodge Neon

1 Answer

My boy has a 1993 mazda protege when he puts in drive engines stalls but not in rev.


There are several things that can cause this type of problem. The most common two problems are vacuum leaks, and a bad IAC (idle air control) I will tell you right up front there are several different names for the IAC, and this always causes confusion. It is basically a little servo motor that is controlled by the vehicles computer. It's job is to control the idle, and not let the engine die as it idles. If your vehicle has vacuum leaks on the intake manifold, or any of the vacuum lines then the IAC cant do its job, and the engine will die at an idle. The best way to proceed is to check for vacuum leaks with a can of WD40 run the engine and get someone to sit in the car and keep the engine running at the lowers steady speed you can keep it running at. Then spray the WD40 all around the intake manifold and vacuum lines. If you hit a vacuum leak the engine will speed up for a second or two. This method will allow you to find almost impossible to find vacuum leaks. If there are no apparent vacuum leaks then it it pretty safe to assume the IAC is the problem. Sometimes they are stuck, and if you spray them with carb cleaner you can free them up where they will work, but most of the time they just need to be replaced.

Dec 20, 2010 | Mazda Protege Cars & Trucks

1 Answer

95 toyota levin starts than stops immediately


CAR START DONT KEEP RUNNING.SYSTEM TOO LEAN NOT GETTING ENOUGH GAS.I WOULD HAVE FUEL FILTER CHANGED.CHANGE PLUGS AND WIRES.YOU COULD HAVE VACUUM LEAK AT INTAKE MANIFOLD OR VACUUM LEAKS FROM HOSES AND HAVE IDLE SPEED CHECKED.IF TOO LOW ENGINE CANT IDLE IT WILL SHUT OFF.

Jun 14, 2010 | 1998 Toyota Camry

1 Answer

Black smoke runs badly, fuel pressure regulator or temp sensor?


look for a vacuum leak. A large vacuum leak will do just what you described. I would listen for a leak first if you cant hear it and locate it then i would spray carb cleaner around the vacuum lines. If you have a leak it will pull the carb cleaner in and you will hear the engine rpm change.

Mar 29, 2010 | 1989 GMC Sierra

1 Answer

1999 rough idle/hesitating at idle .drives fine i


Yes it could be a vacuum leak at the intake manifold, could also be the MAF sensor (especially if you use a gauze/oil air filter).

Oct 25, 2009 | 2003 Ford E250

1 Answer

97 gmc suburban air wont come out front vents only bottom and defroster?


check for vacuum leak under hood on passegers side ,replace vacuum tubing even if it looks ok could be pinched or pin hole u cant see vacuum going from eng compartment to inside firewall

Jun 27, 2009 | 1996 GMC Suburban

2 Answers

Ford truck f250 v8 motor idles high after engine heats up it idles higher cant find a vacuum leak replaced a idle air valve it didnt help


the vacuum leak that causes this high idle is the gasket at the bottom of the upper intake manifold runners, they **** in, done 100's. to confirm this just spray carb cleaner at inside and outside base, when u hit the leak you will hear it. see photo.

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May 10, 2009 | 1992 Ford F250

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