Skip the auto shop - Our mechanics make house calls

Q: Hi - Knocking noise

asked by on

Hi I have just pour fuel injector cleaner in my fuel tank. As driven about 290 km my car has start knocking in 40-50 kmph. It goes away as I accelerate more or drive between 25-30 kmph. What should I do now to make my car smoother again. My car talking a little long self when its hot, so I pour injector cleaner. Now two problems are present. 1. Long self when hot. 2. Knocking sound

Car is 1000 cc 2nd generation VITZ By TOYOTA

My car has 153000 miles.
My car has an automatic transmission.

Hello. If there is a knocking noise then it may have some bad fuel or it may be another failure like an internal engine problem or a bad sensor. I usually start the diagnostic process by scanning the computer for codes, checking to see if there are any sensors that are reading incorrectly.

If those are all fine then I check the fuel pressure to make sure that the fuel pump is fine and then do a compression test to see if there are any internal engine issues.

If you want to have this repaired, consider YourMechanic, as certified mechanic can come to your home or office to diagnose the sound firsthand and help you make an accurate repair.

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: Steering wheel feels too loose

Steering components do wear over time, but what you're describing sounds excessive. The problem could be play in the steering gear and/or linkage. Your steering wheel connects through the column, to the steering gear, tie rods and finally the steering...

Q: compatible transmission from another vehicle to fit mine

Hello. It would appear that Jeep Wranglers are only equipped with 4 or 6 cylinder engines. Your Durango comes equipped with a much larger (and more powerful) v8, which means those engines will likely not work correctly in that vehicle....

Q: Leaking water pump

If the water pump is leaking, then it will need to be replaced. Please note that cooling system checks or repairs should never be carried out on a hot engine, or on a pressurized cooling system, or serious injury can...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...