Skip the auto shop - Our mechanics make house calls

Q: Knocking/ Pining/ Dieseling noise

asked by on

Toyota dealer couldn't figure it out after trying tune up, fuel injector service. They sent a recording of the noise with a scan tool to a Toyota engineer and their response was thats normal. I have been using premium gas, tried carbon cleaner in my gas and nothing helps. I'm not an oversensative driver, the knocking gets REALLY bad when the car is going up a slight hill or getting on the highway via on ramp.

My car has 75000 miles.
My car has an automatic transmission.

A: Hi there. If your Tacoma is a 4x4, then che...

Hi there. If your Tacoma is a 4x4, then check the transfer case and see if that is where the noise coming from. If it is, then the chain in the transfer case is slipping and needs replaced or repaired. If your Tacoma is a 2x4, then the noise would be coming from the flex plate as it could be bent or cracked. This is a common issue with Toyota vehicle. If you need further elp with your vehicle, then seek out a professional, such as one from YourMechanic, to help you with the knocking noise.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Ignition key won't come out of the switch.

Hi there. If the steering wheel lock is causing the key to say in the ignition system and also keeping the vehicle from starting due to the lock being stuck, then the steering wheel lock solenoid may not be working....

Q: Stiff steering wheel, Battery Light flashing, and noise under hood.

Hi there. The stiff steering wheel and flashing Battery Light may be caused by a serpentine drive belt that has broken or come off. It could be that the serpentine belt tensioner pulley was making noise and seized or that...

Q: My son bought an S10. It drove for a week. It was good until I changed oil and heard a knock!

Hi there. I hate to be the bearer of bad news, I but I think you will need to pull the engine out, disassemble it, and check clearances precisely to determine the source. Given your mileage, and the "sludge" condition...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...