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Whistleing sound when engine is idling - 2003 Dodge Caravan

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Cracked vacuum hose?

Posted on Jul 17, 2009

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Making whistle noise on off on run and stopping.


There are basically two types of whistle noises.

* Whistle when you get more gas (increase RPM, put gas pedal, sometimes just idling but louder when you put more gas)
This usually intake-side leak.
Intake manifold itself, intake manifold gasket (most likely), even airfilter housing, Airflow meter housing (connector), anything where air goes to engine.
usually engine get rough or unstable idle when intake leak occur.
Engine knocking or pinging may feel.

* Whistle when you decrease RPM (engine brake, reduce speed, sometimes just idling but louder when it dropping RPM)
This usually Vacuum-side leak.
There are many vacuum hoses in engine room. even inside of cabin (heater control, etc)
Try to spot where it coming from.
Vacuum also connected to Brake servo, heater control and spark timing.

Put metal or plastic pipe (small PVC pipe will work fine) to one of your ear then isolate source of noise and find where it come from.

Feb 26, 2016 | Cars & Trucks

1 Answer

My engine is idling very high


High idle speed is an indication of a vacuum leak. Listen for a small whistle. Find the whistle sound, you will find the leak. Now repair the bad hose, or broken plastic tube with a small chunk of hose that will fit over the tube. If it is more major, it could be an intake manifold gasket. The engine uses an idle air motor to control engine RPM. After fixing the vacuum leak, the engine may not idle at all, until you drive the car for about 5 minutes above 40 MPH. The idle air motor resets itself to 0.

Apr 12, 2013 | 2004 Chevrolet TrailBlazer

1 Answer

Can a air idle conrol valve whistle when cold


You are so right the IAC can make that whistling sound,

Nov 05, 2012 | 2004 Mercury Grand Marquis

1 Answer

Got a 99 Nissan Altima 2.4, t-chain broke... replaced head and all t-components... start up surging idle and whistling off idle... engine runs smooth and great power off idle


the surging and whistling sounds like there might be a vacuum leak that is causing this.recheck all vacuum lines and surfaces were this is a gasket that seals a vacuum source.smooth running and good power off idle suggest this leak only affects the motor at a low(idle)rpm.

Apr 14, 2011 | 2005 Nissan Altima

1 Answer

Whistling from engine


This is a symptom of the inlet manifold gasket having a leak.The whistling is air going in through the small leak/hole in the gasket.With the throttle butterfly shut,air is getting sucked in the only way it can.Try tightening the inlet manifold bolts 1st.But more than likely the gasket needs replacing.Hope this helps

Jan 09, 2010 | 2000 Jeep Cherokee

1 Answer

When i give my car gas a whistle comes from the engine. It's a high pitch continual sound. When i let off the gas the whistle stops. It sounds like it's coming from the top of the block.70k miles...


Sounds like a vacume leak, chk. for a cracked or broken vacume line or maybe one came off. Does it idle ruff? With it running open hood and listen for a low pitch whistle you may have to rev it up a little.

May 31, 2009 | 1986 Ford Thunderbird

1 Answer

Whistling noise in engine and rough idle


check all vacuum hoses,sounds like a leak, try spraying carb cleaner near noise,if engine rpms go up you found the leak

Apr 09, 2009 | 1998 Audi A4

1 Answer

Surging and loud whistling noise


Sounds like a vacuum leak. Check all vacuum hoses on the intake, throttle body, etc. Sounds like one cracked or came off. Post back if you have any questions. Hope this helps.

Feb 08, 2009 | 1996 Chevrolet Impala SS

2 Answers

My 1994 Jeep Grand Cherokee is making a whistling sound. It whistles when I am giving it gas even coasting. But when I slow down, it stops or gets quieter. We changed the PCV valves and hoses for the...


Often a whistling sound, from the engine bay anyway, is the sign of a vacuum line that is leaking. Might want to check all the vacuum lines for cracks and such and make sure they are all connected.

Dec 31, 2008 | 1999 Jeep Grand Cherokee

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