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How do I Check for a vacuum leak around all intake and vacuum lines.

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Start the vehicle spray carb cleaner on lines and any possible areas for a vacuum leak. The rpms of the vehicle will fluctuate when the spray hits the leak.

Posted on Dec 31, 2012


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SOURCE: intake manifold vacuum line

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SOURCE: where does the vacuum line on air intake duct

Are you referring to the plastic line that comes out of the top of the duct, turns and disappears toward the back of the engine? That line goes to the top of the rear valve cover. Use a flashlight and look for the hole on the top of the back valve cover. Look to the right and below the coils. It's tough to see but you can see it. Be careful, sometimes the plastic line can be brittle and break.

Posted on Oct 01, 2009

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Hey, that's pretty good logic. Why you asking us? Just the same, I would verify the gasket leak by spraying carb cleaner on the gaskets while the engine is running. If the speed changes, there is your leak. You will have to remove the upper manifold first anyway. Be careful not to tear up the gaskets when you pull the manifold off, so you can inspect to see where the leak was--validate the issue, you know. OK?

Posted on Jan 23, 2011

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SOURCE: CEL Code 71, V-6 engine.

This code can mean no EGR flow is detected, manually open the valve and see if the engine starts to stall, if it doesn't you have a plugged EGR exhaust gas passage

Posted on Feb 26, 2011

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2.2 ltr eng hard starting loud sucking noise around intake

vacuum leak --can be from bad gasket-vacuum line damaged or disconnected --check lines if good and having problems carefully spray carb cleaner or starter fluid around gasket areas when idle smooths out that area is where leak is coming from

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Surging idle 2003 nissan altima s

I think you have an air leak, a vacuum line loose, or possible intake manifold gasket leaking, maybe your big air intake hose is leaking. spray carb cleaner or soapy water around mating surface of intake and on vacuum lines and connections. If idle changes, there is your leak. good luck.

Oct 27, 2011 | 2005 Nissan Altima

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The MOST LIKELY cause of an engine surging and refusing to idle is a vacuum leak. Check all vacuum line connections. You can also pinch rubber vacuum hoses off one at a time near the intake manifold to see if the engine idle changes, - don't forget to check the hose to the brake booster. If pinching off the booster hose fixes the running problem it is possible that the booster itself is leaking if you can't find any leak in the hose.

You can check for vacuum leaks at the intake manifolsd gaskets and throttle body base by squirting some carburetor cleaner around these areas. If you spray this into a vacuum leak area, you will hear a change in engine RPM.

Aug 16, 2011 | 1994 Chevrolet S-10 Blazer

1 Answer

How do I check for a vacuum leak on this vehicle?

I do it two ways. The not so safe way is start the motor and spray starting fluid around your intake and vacuum lines. If the motor idles up theres your leak. The safer way is take a little LP torch turn it on but dont light it and monuver it around the intake and vacuum lines with motor running and again if motor idles up theres your leak. I hope this helps you good luck. kyle

Jun 22, 2011 | 2000 Chevrolet S-10

2 Answers

97 ford thunder bird lx engine light on rough idle when put in to drive rpm drop below normal

Sounds like you have a vacuum leak. To test you will need a small bottle of propane. Usualy comes in a blue can and a nozzle to control the flow out of it. Start the car. Pop the hood. Locate your vacuum lines. Move the bottle around the lines, intake cleaner, intake manifold. Listen for the idle to smooth out. You will have located your vacuum leak.

Sep 22, 2010 | 1997 Ford Thunderbird LX

1 Answer

Have a 94 Cutlass 3.4 that idols irratically. We have replaced coil packs, spark plugs ans wires, and the iginition modual. What else can it be?

Check the engine for vacuum leaks around the intake gaskets.Just spray it with carb.cleaner or brake clean while the engine is idling.While you spray around the intake if it is leaking you will hear the idle smooth out when you spray where it is leaking.Also check the egr valve and make sure it is not sticking slightly open.Check all the vacuum lines.Hope this helps.Good luck.

May 07, 2010 | 1994 Oldsmobile Cutlass Supreme

1 Answer

Everytime i stop for a long or short time the car will cut off i replace the spark plugs and wires and the roader cap and ball

Possible vacuum leak. Use a can of carb cleaner spray to check for vacuum leaks. Remove air cleaner housing assembly and plug the vacuum line. Start car. While idling in park, spray cleaner around base of carb, intake manifold to head area and around all vacuum lines. If the idle increases or smooths while spraying an area, that is where the vacuum leak is.

Feb 21, 2010 | 1983 Oldsmobile Delta 88

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It wants to red line after I start. This happened

Check the intake manfold and gaskets for vacuum leaks. too ways to do this plug the throttle body completly with your had if it does not stall out you have a vacuum leak. Take some carb cleaner and spray it around the mainfold and notice for idle changes to pinpoint the leak. hope the info helps please rate.

Jul 11, 2009 | 1999 Jeep Wrangler

1 Answer

Engine running at 1500 rpm to 3000 rmp when started but stays at 1500 at a red light when driving car stay at 2000 to 2500 rpm

Your problem is typical to a vacuum leak. Check all of the vacuum lines connected to the engine for proper connection, and make sure there are no cracked vacuum lines. If you don't see any vacuum hose problems you will need to check the intake for leaks. The easiest way to do this is to take a spray bottle full of water and spray it around the intake and intake hoses with the engine running. If there is a change in engine RPM's while spraying with water, inspect area for the source of the leak.

Aug 12, 2008 | 2003 Dodge Neon

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