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Engine knocking

Tiny
NEBU MAMMEN
  • MEMBER
  • 2016 TOYOTA COROLLA
  • 1.8L
  • 2WD
  • AUTOMATIC
  • 9,000 MILES
While cruising at low speeds, the engine knocks on accelerating from a speed of between forty and fifty kmph. It does not happen at higher or lower speeds.
Is it because it does not sense the drop in speed and change gears?
Could you suggest a possible cause/solution?
Dr. Nebu
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Monday, July 3rd, 2017 AT 6:29 PM

9 Replies

Tiny
HARRY P
  • MECHANIC
  • 2,293 POSTS
Many cars can be very picky about their fuels. Poor fuel quality could cause what is called a "spark knock." Which sounds similar to an engine knock. What brand of gas do you usually get?
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Monday, July 3rd, 2017 AT 7:39 PM
Tiny
NEBU MAMMEN
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  • 5 POSTS
Thank you for the reply.
I live in India and use the regular petrol supplied by Indian oil company.
This problem occurs only at a speed of around forty kmph, not at higher or very low speeds.
At times I anticipate the knocking and shift gears using the paddle shift. It goes into third gear and does not knock on accelerating then. Hence I thought of a problem fue to the gear shift not occurring on time.
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Monday, July 3rd, 2017 AT 8:10 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Do not disregard the knock sensor itself, a code read will tell you if the sensor is faulty.
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Tuesday, July 4th, 2017 AT 3:35 AM
Tiny
HARRY P
  • MECHANIC
  • 2,293 POSTS
Definitely get the codes checked. If the service engine light is on, and let us know what it says. If the light is not on, I would try a different fuel, if anything is available. Admittedly, it has been twelve years since I have been to India, so I do not really remember what your options are concerning fuel.
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Tuesday, July 4th, 2017 AT 4:44 AM
Tiny
NEBU MAMMEN
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  • 5 POSTS
No warning lights are on.
If it is a fuel problem would it not knock at all speeds?
Will ask Toyota guys about the codes.
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Tuesday, July 4th, 2017 AT 5:31 AM
Tiny
HARRY P
  • MECHANIC
  • 2,293 POSTS
In my experience spark knocking is usually heard at certain engine speed ranges (usually low speeds). That is not to say that it is not happening at all speeds, but that is just when it can be heard.
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Tuesday, July 4th, 2017 AT 6:16 AM
Tiny
NEBU MAMMEN
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  • 5 POSTS
I get it. Will let you know what they find in the next round of checking.
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Tuesday, July 4th, 2017 AT 6:41 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,960 POSTS
Please let us know what happens, we are interested to see what it is.

Cheers, Ken
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Wednesday, July 5th, 2017 AT 2:34 PM
Tiny
NEBU MAMMEN
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As I will be travelling, they will do tge next check by the end of the month. Will put up the progress.
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Wednesday, July 5th, 2017 AT 6:43 PM

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