Q: Why is my car loud at idle and when accelerating

asked by on

A couple weeks ago, my car had gotten acceleration problems. I got it tuned up. Still had problems, found out the egr valve gasket was blown. Got a new egr valve and gasket, changed the fuel filter as well. At idle it sounded like a brand new car. It drove better until I hit 40mph and i heard this clicking noise, it went away. Then again at 40 I had to let off the gas because it would rev like it’s in idle hitting the red limit(only when I tried to floor it) So I drove normal 2 days later. I hear this clicking noise. I lift the hood. And hear a clicking noise coming from the egr valve. I go to autozone and they said I have a bad map sensor. That’s the only code that popped up. Well I wouldn’t be able To fix that until Friday. Now I’m thinking does a clicking egr valve have anything to do with that. So I’m driving at night and out of nowhere my car gets loud as I accelerate. I turned it off and it’s still loud. And when I’m crusing it kind of goes away until I accelerate. Help ? thecat?

My car has 195000 miles.
My car has an automatic transmission.

Generally loud "noise", especially on acceleration, is due to exhaust system leaks or internal muffler (e.g., baffle) failures. The ticking noise is more likely coming from the valve train and not the EGR valve. The OBD-II diagnostic code that "refers" to the MAP sensor can NOT be used to condemn that part especially as MAP sensor out of range readings can simply be due to fluctuations in intake manifold pressure which can in turn be due to faults that have nothing to do with the MAP sensor itself. As an aside, GM MAP sensors RARELY fail. Most are replaced because people mistakenly assume that a "trouble code" that includes the sensor is an actual diagnostic. Trouble codes are NOT diagnoses and thus you should never replace a vehicle part SOLELY on the basis of a trouble code! I think in your circumstance, you are going to be best served by requesting a vehicle noise diagnostic. Although that is nominally the diagnostic, the responding certified mechanic will evaluate all of the concerns that you have referred to in your question and then get the underlying fault(s) resolved. If you have further questions or concerns, do not hesitate to re-contact YourMechanic because we want you to make the most of your repair dollars and help you to get the best possible results.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Why is my car loud at idle and when accelerating

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My van loses power going uphill sputters like it's going to die I've changed my fuel filter and it has not helped

Hello. If the vehicle only does this while going uphill and no other times then it is usually caused by a failing catalytic converter or a weak fuel pump. Both of these will cause this as well as a failure...

Q: Fuel pump relay issue. 2000 Buick LeSabre

Hi there - the first rule of modifications is that when things stop working, you revert to the condition before the last change. In this case, remove power to the new stereo components, recheck your fuel fuses and the pump...

Q: One of my engine mounts crack and my mechanic suggests I replace all of them front rear and side. I look up the parts is the side

I suggest you verify with the mechanic since they may be referencing the motor mounts front and rear but they are also called transaxle mounts when parts are looked up. The engine has one main mount in front of motor...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...