Question about 2001 Mazda MPV

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Air intake makes knocking noise when i let off the gas

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Take it to auto zone or any other car parts store to get it looked at. walmart could even look at it for you

Posted on Nov 03, 2012

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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

Knocking engine ?


Are you sure you are not hearing a popping noise from upper intake and throttle body because of a intake valve burnt or sticking open. Do a compression test on all six cylinders to see which one is low.

Jul 19, 2014 | 2003 Buick Century

1 Answer

Noise air intake


moving only or all the time..........???????????????????????
this is a hands on deal, no web bunny can guess.
it takes tools and all senses to find this. humans, touching....
ok, ill guess. the tappet is bad.


most FSM have a huge chapter just on noise,that works about 10% of

http://www.fixkick.com/NOISE.html

3000 parts on the car, any can make noise. for sure moving.
start with a stethoscope.

Jan 11, 2014 | Toyota Corolla Cars & Trucks

1 Answer

1990 toyota 4runner knocking noise from air intake will turnover but wont start


Knocking noise in the air intake or do you mean a lifter noise,because you let it sit the lifter are not charged up or solidified,so you dont get adequate compression when you turn it over.if you have fuel and spark thats fine what about compression,noise from the air intake make me wonder if the timing belt is intacted.

Feb 04, 2013 | 1990 Toyota 4Runner

1 Answer

My 1992 300zx is making a pinging sound when pressing on gas peddal


Try this. Burn off your current take of gas, get it down to a quarter tank or so. Fill up with premium gas. If the noise goes away it is probaly a condition known as ping. Which is the predestination of the air fuel mixture in the combustion chamber. This can be caused by carbon buildup and could be resolved with an upper intake and valve cleaning. If the noise persists it is most likely a mechanical engine noise, an experienced ear will be able to tell you what the noise is.

Aug 10, 2012 | 1990 Nissan 300ZX

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

3 Answers

Knocking sounds


Windstar's are notorious for having intake manifold air leaks, they even make a kit to repair it. I would send it to a repair shop as it is a time consuming repair.

Jul 11, 2009 | 2001 Ford Windstar

1 Answer

Car making loud humming noise from the air intake or air filter when idling ,a/c on and pressing gas petal.


the idle air bypass valve is making noise and resonating through the air inlet the valve needs to be replaced there is also a revised hose to the valve to reduce noise if it hasn't already been replaced

Jun 16, 2009 | 1994 Ford Crown Victoria

2 Answers

1997 pontiac grand am knoking topside, ajusted valves, replaced fuil filter, fuuil regulater, intake gasket, cleaned injecters,what eilths could it be?


If im correct i beleive those engines have hydraulic lifters in them. Thats probably whats making the noise. it's useless to replace them. It's not gonna affect your engines performance. just let it knock

Oct 08, 2008 | 1997 Pontiac Grand Am

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