Question about 2002 Nissan Altima

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I have a slight rattling noise coming from under the hood whenever my car is in gear. The noise is not audible when in neutral or park. Could it be as simple as needing a new air filter?

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Check your oil level. Vavle timing is set by oil pressure and if the oil is low or poor it may tick.

Posted on Feb 03, 2010

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1993 Saturn sl2 will make rattling noise coming from under hood while sitting at a light with foot on brake if I put in neutral or park it stops and when I'm driving also what could be wrong with it


Chances are that a heat shield located under your exhaust or the catalytic converter has broke loose and rattles when you are idling in drive. This is common on older cars and is only usually noticed while idling in drive because the engine is working under a slight load and runs a little rougher. A good exhaust shop could probably fix it for very little.

Nov 23, 2014 | Cars & Trucks

1 Answer

Rattling noise , engine noise, that accelerates while increasing speed.


if this is under the hood (front of car), it could be an exhaust heat shield that is either corroded loose or a fastener has come loose. Does it happen when you rev the engine in park? if so, either have someone rev while you watch for whatever is rattling or have them watch while you rev.

Mar 01, 2014 | 2004 Chrysler Sebring

1 Answer

Light Vibration and Humming sound in cabin


no posts on this old post. but no year, so .... as an example
to others posting, NO year?, NO answers.
but... here you go.
NOISE MOVING, ONLY !: (dangerous tests)
NO noise , in neutral, guning throttle like mad man.
or doing same in drive, all brakes set, wheels chocked,
DO the FSM A/T trannny Stall test. 5seconds max !, at 0MPH this puts full load on most the parts, MAKE NOISE NOW?
moving.....
cutting the engine , depends? in neutral? or coasting in gear.
risk 2, accidentally hitting park doing the test.
risk1:
selecting neutral and cutting the key (danger if the steering locks ) do so only off road, and no people about, no turns., no cliffs, no trees, no rocks. (flat desert or parking lot, at early hours..etc.)
Safety first.....
"and it goes off."<<< meaning the noise stops? key off?
btw:
the wheel bearing are under full load, now.
in turns the wheel bearing are under more load (huge in fact)
and the CVs run all the time.
but, if goes off means. no sound , it can be. (sure not wheel bearings)
1: exhaust parts, rattling. (running)
2: engine noise. (lots of possible) , but see test above.
3: A/T trans noise (its A/T right?) bad front, A/T pump? or TC?
or 150 other vastly complex A/T parts. bad.
when coasting , the CV do turn all the rear planetary gears ( and axle gears)
so they are not bad, as the quiet sound ending , proves.

keep in mind most parts, under torque love to make noise.
so cutting the engine, cuts most that torque, and hides the bad parts, with silence.

i use and remote electronic ear to find moving noise.
electronic stethoscope.
it has small microphones that clamp to suspected parts.
this removes most the danger in testing.

good luck finding it, if it still makes noise.


Aug 28, 2013 | Honda Civic Cars & Trucks

1 Answer

Knocking/tapping sound behind left side of engine


if the knocking is occurring while vehicle is in motion it can be a driveshaft cv joint bad..if it occurs while not moving but in gear, it could be the exhaust rattleing under the car..may also be the front end suspension bushings worn..

Feb 12, 2013 | 2001 Mazda MPV

2 Answers

1997 s10 2 wheel drive truck. 4.3L v6 makes a loud noise as the car accelerates fast or under load. When running 55 I can release the gas pedal and the noise is not audible. I can put the truck in neutral...


Your noise sounds like it is power train related,If you have eliminated the engine,Since it doesn't make the noise while moving and in neutral.
It sounds like a universal joint in the drive shaft.Do you notice a vibration
along with the noise?

Nov 17, 2009 | 1997 Chevrolet S-10 Pickup

2 Answers

97 Lexus Es300 noise under the hood by alternator


mcdevito75 here, If you have 1 continuous belt on the engine (serpentine) then the belt could be worn or the tension pully holding the belt tight could be going bad. No noise in Neautral or Park as increased engine speed in these gears over rides the worn part and thus no noise. On a cold engine examine the belt, look for frays / wear from where the belt rides the pullys. If the belt is 2 years old, Change it.

Jun 06, 2009 | 1999 Lexus ES 300

2 Answers

Rattling from under the hood


I would start by splitting up the drive train to determine if it is accessory, engine or transmission related.
There are a number of things that can cause a problem like this.
1) Is the noise louder in drive or reverse.
2) I would start with heat-shields because of your "clank" description. Exhaust manifold, catalytic converter shields and any other you can find under hood or under body.
3) If all is good, check engine and transmission mounts. Make certain none have collapsed, cracked or broken.
4) If all good, remove all accessory drive belts and start engine to see if noise goes away.
That's a lot to start with, so let me know what you find and we will go from there.
Regards.

Mar 30, 2009 | 1995 Buick Riviera

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