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I have a 2000 Mazda protege es, and when I turn car off I hear whistling noise coming from air intake hose. Is it normal for vacuum to always be on thru air intake hose? I took intake hose off mass air flow sensor and started car and turned off, while hold my hand over open end of hose and vacuum continued and made whistling noise. Is this normal?

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1 Answer

No hole in line somewhere

Posted on Oct 18, 2013

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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daves944
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SOURCE: Need to find Mass Air Flow sensor on 98 Camry

You are not stupd! :-) This car has a speed-density system. The computer is programmed to meter fuel and spark timing from manifold absolute pressure (MAP), engine temperature, air temperature, and throttle position only.

Are you having a problem?

Posted on Mar 29, 2009

  • 1 Answer

SOURCE: Cold Air Intake - Mass Air Flow Sensor Adapter

i have a 91 mx6. the intake is all cattywompus and im just goin to take a piece of metal and tube and cut a hole in the peice of metal and weld the tube to it take my stupid box out and run that pipe staight to a coupling and then to the cone air filter. BAM!!!! problem fixed... i maight be able to fix yours too... e-mail me ajjordan64@hotmail.com. k?

Posted on Apr 16, 2009

co7196
  • 3433 Answers

SOURCE: 2004 Mazda MPV vacuum line from pcv valve and

You have the wrong type hose on the pcv valvle. It isn't vacuum hose.

Posted on Nov 12, 2009

Testimonial: "thank you you have been very helpful i understand now but the hose that is on the new pcv valve is a vacuum hose "

greezy_je208
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SOURCE: High pitched whistle noise coming from engine

it sounds to me like it is a blower motor not the engine.(heater fan)

Posted on Dec 16, 2009

  • 617 Answers

SOURCE: Location of mass air flow sensor, 2000 Grand Prix GTP

3.1 or 3.8 motor, mass air flow is in the fresh air (goes from air cleaner to engine)

Posted on Feb 07, 2010

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1 Answer

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

Sounds like air is shooting out when accelerating. Could this be an exhaust leak? Plugs, coils, hoses seem fine. Noise is coming from passenger side under engine sounds like.


yes could very well be an exhaust leak.but that should be kinda loud and annoying..also u could have a slight whistling sound coming from ur air intake hose coming from air cleaner box to ur intake or throttle body or ur air inlet goin to the motor. when the motor is accelerated it would produce a high pitch sound like a whistling .hope this can help

Jun 28, 2015 | 2001 Mazda Tribute

1 Answer

Code p0401


on a mazda protege. 1.8L. You have a clogged vacuum port. On that intake back by the EGR valve there should be a port with a vacuum hose that goes over to the Right side strut tower. That line should have vacuum. That controls your EGR boost solenoid. If that line does not have vacuum it will be clogged at the nipple where it comes out of the intake. Step two. Take off throttle body. Behind the throttle body, looking inside the intake, there should be a big vacuum port. It will be clogged. You will see a big black ring most likely around the hole where the port should be. I usually pull the EGR valve off the intake so it doesn't get carboned up. Blow through that vacuum port with shop air and use a pick and some carb cleaner on it. This should solve your issues with the egr flow issue on this vehicle. 9/10 the ports will be clogged. Good luck.

May 03, 2014 | Mazda Protege Cars & Trucks

1 Answer

Whistle from turbo.. 2007 mazda bt50 2.5 diesel turbo. . While accelerating I get this whistle noise in the cab. High pitched sort of. it sounds like its around the passenger side footwell.. if driving...


locate the waste-gate and see if you can cover it temporarily while driving. see if this changes it any. It could have a pin sized hole in the diaphragm. just a guess.

May 04, 2014 | Cars & Trucks

1 Answer

What is a vaccum leak on a 1999 buick regal


All engines have vacuum created in the intake manifold, because the pistons are pulling in air into the cylinders from the intake manifold, resulting in a pressure drop in the intake. A leak is caused when the intake manifold gasket is bad, or when a vacuum hose off the intake becomes disconnected or breaks. The hose will then **** extra air into the intake, causing a higher than normal idle, maybe a rough running condition, and can be identified by a slight whistling noise at the break or at the disconnected end of the vacuum hose.

Feb 20, 2012 | 1999 Buick Century

1 Answer

I ran fault coded on my 2002 Mazda protege. It comes back fuel too lean bank 1. Already had fuel pump checked, and that was not the problem. Any ideas?


YOU COULD HAVE AIR LEAKS IN THE INTAKE MANIFOLD OR EXHAUST MANIFOLD.RESTRICTED FUEL FILTER AND FUEL INJECTORS.CHECK FOR BROKEN OR LOOSE VACUUM HOSES.FUEL PRESSURE REGULATOR FAILED.

Jan 24, 2011 | 2002 Mazda Protege

1 Answer

Hi- I have a volvo v70 automatic, this fault comes and goes.....the engine idle is very eratic and also not always at the same time there is a terrible whistling noise from the engine. Thanks Phil


Sounds like you have a leaking vacuum line. If it has a hole or is cracked, it will leak or **** air causing the idle to be erratic. The vacuum lines or hoses should be traced down for any cracks or dry rot and replaced. The heat from the engine and the emissions causes the hoses to break down and a lot of people don't realize these should be replaced. The vacuum lines or hoses coming from the intake area is the main area to look at.

Jun 05, 2010 | 2000 Volvo V70

2 Answers

Whistling noise while driving


If it is whistling while you rev your engine (while parked), then most likely there is a leak or hole in your air intake or vacuum hoses.

Facts:
1. Your car creates a vacuum to constantly receive air from the outside.

2. A whistling noise is created when air travels through a hole.

Check all air pressurized ducts for holes or leaks.
Check air intake system for holes or leaks.

Jan 08, 2010 | 2000 GMC Jimmy

1 Answer

Mazda Protege 2001.. when i start the engine. it makes a single popping burst. and when i speed up, the noise continues and fades down after a while.. can anyone suggest the problem please..


sounds like a misfire. first check it intake hose from the air filter box to the throttle body. check it for cracks. remove it if you have to. air entering the intake behind the MAF sensor causes improper air/fuel mixture which could cause your misfire.

if all is well it could be in need of a tune up plugs/wires (don't use aftermarket wires get mazda ones) coils could also be weak.
start from plugs to wires to coils, after checking the intake hose.

Jun 22, 2009 | 2001 Mazda Protege

1 Answer

Whistle noise when moving


Could be a vacuum leak i would pop the hood and see if you can hear or see a hose off or hear a sucking whitling noisegood place to look is at the back of the motor and around the brake resovoir

Nov 10, 2008 | 1991 Mazda 323

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