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
  1. Home
  2. Questions
  3. Hi - Knocking noise

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: AC initially not blowing cold air

I have seen this before. It is usually caused by either low refrigerant levels which would mean you have a leak, or a condenser fan that is not working. A mechanic, such as one from YourMechanic, can help you diagnose...

Q: Engine stumbles at low speeds - 2007 Dodge Sprinter 3500

It may be at a particular throttle angle and the EGR valve is getting carbon into the valve causing the erratic idle. You may need to have the engine decarbonized. If you hold the engine in neutral and REV it...

Q: Vehicle wobbling when driving

Hi there. If your vehicle feels like this while you drive then you either have worn out suspension struts or you may have a loose suspension part. A mechanic would typically start by checking to see if there are any...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...