Q: vibration and shaking at idle. also very loud and noisy engine. replaced all motor mounts, spark plug components, and intake syste

asked by on

I noticed that ever since I bought my car it shake at a red light or stop sight until I hit the gas. It is also accompanied by a very loud noisy that persists when I accelerate. when at idle its a pulsating noise sounds like a pulley. I have replaces all motor and trans mounts. also all spark plugs, wires, and ignition coil pack. the timing belt has been replaces as well as water pump. idle air control valve and throttle body has been replaced. no blown head gasket or leak. have replaced all vacuum hosed and PVC valve. the king is worse when idling as well as the noise from the engine along side some ticking noise.

My car has 139000 miles.
My car has an automatic transmission.

Often noise is related to exhaust system leaks or internal failures in the exhaust such as loose baffles in the muffler. To rule out accessory drives and pulleys as a source of noise what you can do is momentarily run the engine without the serpentine belt attached. That will help you distinguish between "internal" engine noise versus noise from "external" accessories such as a pulley, alternator, etc. The rough idle and vibration could be due to anything from sticking valves and uneven compression (all mechanical problems) to a bad tank of gasoline, dirty fuel injectors, incorrect idle speed, exhaust restrictions, vacuum leaks, incorrectly installed or damaged spark plugs, a defective or clogged fuel pump or fuel filter, failing electrical components such as the ignition control module, plug wires, coils, and spark plugs, a defective airflow sensor, dirty oxygen sensors and other causes. I would recommend that you request a rough operation/rough idle diagnostic and the responding certified mechanic will perform the required diagnostic steps to get all the issues (noise, rough operation, etc.) resolved. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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. vibration and shaking at idle. also very loud and noisy engine. replaced all motor mounts, spark plug components, and intake syste

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 vw 04 beetle ticks when idling, the ticking goes away when you give it gas.

The problem sounds like you have low oil pressure and and engine knock due to engine rod bearing or crankshaft bearings are worn. You may also want to have front crankshaft pulley checked to see if it is bad before...

Q: Hissing sound coming from the front of the car

It sounds like the AC lines may still have a leak in them as indicated by the hissing sound you describe. This is a common sound when there is a leak in the AC system. As the AC compressor builds...

Q: I opened my trunk by accident in the house with my keypad, can I lock it back using the keypad?

You cannot use the remote to close a trunk after you have opened it. You will need to close it manually.

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.