Skip the auto shop - Our mechanics make house calls

Q: I've got a knock it increases when I push on the gas should I just replace the engine?

asked by on

So I go to accelerate from a stop light and my 4runner barely accelerates and starts knocking I didn't have cab fare so I drove it the rest of the way home about 5 miles. It only stops knocking about midway through the RPMS before the shift. Is it time to take her to the mechanic and get it running like new or is it time for a new car? Toyota Holds it's value fairly well I just don't want to fix something that would be worth less than my mechanics bill.

My car has 177000 miles.
My car has an automatic transmission.

Hello, and thank you for writing in. A knocking noise may be coming from the engine or the exhaust. Without pinpointing the exact location of the repair, it is very difficult to compare your options truthfully. An exhaust leak will cause the engine to lose power and make a knocking noise. The timing belt, and accessory belts can also create a knocking and are fairly simple to replace. More serious issues may also be happening, but we will not know until we find out where in the vehicle the noise originates. With that being said, even serious repairs can be rebuilt or replaced. It all depends on the rest of the vehicle’s condition and its sentimental value to the owner. For more help inspecting the vehicle, contact our service department to schedule an appointment.

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
  1. Home
  2. Questions
  3. I've got a knock it increases when I push on the gas should I just replace the engine?

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: No acceleration or RPM increase while pressing gas pedal

It sounds like you may have an issue with your throttle position sensor. This sensor sends a reference voltage to your power-train control module, which uses that to determine ignition timing and fuel trims. If the power-train control module is...

Q: Car makes knocking noise

A knock is never good to hear on a car and could mean catastrophic failure in the engine. It could be something simple like something coming loose and knocking in the engine compartment, but it could also be something as...

Q: Rumbling on acceleration and idle while using air conditioning.

This may be related to a dirty or failing idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...