Skip the auto shop - Our mechanics make house calls

Q: knocking and loud engine sound and poor acceleration.

asked by on

I have changed the fuel injectors , but still the car has a Lound and knocking sound. The acceleration is very poor and white smoke is emitted
My car has an automatic transmission.

Hello there, many faults will cause your 1994 Mercedes-Benz E320 to have a knocking sound and smoke. The most common is low oil level, spark plugs, fuel pump, plug wires, low oil pressure, piston rings, or engine mechanical damage. This vehicle should not be driven in its current condition until it is repaired. A qualified Technician such as one from YourMechanic will be able to diagnose your knocking noise and make any repairs required.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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: Starts missing after it gets warmed up.

Hi there, It sounds like you may have a faulty idle air control valve or potentially a faulty MAP sensor. The IAC valve is activated when the car is warm and helps the engine cope with loads on it during...

Q: Have e320 2000 Mercedes Benz getting code p1491 and check engine light on.

This code is related to the pressure in the AC system and suggests that it is too high. When this happens it is usually a result of some kind of blockage in the system. There is also a pressure sensor...

Q: I don't know how to reinstall my camshafts.

Usually everything is timed at top dead center when doing jobs like this. You should turn the engine until cylinder number 1 is at top dead center, then install the camshafts so the lobes for cylinder 1 are in position...

Related articles

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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.