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Engine acceleration issue - Suzuki Alto HA36


aamarakoon

Question

There is a strange issue with my parents 2018 Suzuki Alto HA 36. Milage 14000. Genuine. Personally imported, we are first owners. 

In January my mother met with an accident when she tried to reverse from parking. Apparently, the car accelerated violently when her foot was off the accelerator. And again when moving forward just seconds after. However, I was reluctant to  believe though my mother had driven vehicles for about 25 years. 

Then everything seemd fine. I drove it myself for about 500km.

Today the car the same issue few moments after a cold start. Engine accelerated suddenly, even when accelerator was released. Efficiency indicator around the speedometer had turned orange (haven't seen it ever before). No check engine or any other indicators lit. Car was put in N and eased to a halt. After shutting down the engine,everything became normal. Drove 250km without any issues. Has anyone ever experienced something similar? What would be the most appropriate way to find out the problem? 

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Posted (edited)

It could be a stuck throttle body or something with the accelerator linkage itself. Of course, this would be the "simpler" explanation before the hundreds of other things that it could be (e.g. faulty sensors and ECU causing erratic supply of fuel and air...).

When was the last time your car got a proper service/tune-up? Are there any other issues, e.g. accelerator pedal feeling heavier or feeling not as linear as it used to be, intermittent misses/hiccups, hissing sounds from the engine, exhaust having a petroleum smell, petrol smell from the engine compartment, etc... ?

Edited by iRage
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9 hours ago, iRage said:

It could be a stuck throttle body or something with the accelerator linkage itself. Of course, this would be the "simpler" explanation before the hundreds of other things that it could be (e.g. faulty sensors and ECU causing erratic supply of fuel and air...).

When was the last time your car got a proper service/tune-up? Are there any other issues, e.g. accelerator pedal feeling heavier or feeling not as linear as it used to be, intermittent misses/hiccups, hissing sounds from the engine, exhaust having a petroleum smell, petrol smell from the engine compartment, etc... ?

Thanks. No errors on scanning. No other issues as well. Services done on time.

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22 hours ago, aamarakoon said:

Thanks. No errors on scanning. No other issues as well. Services done on time.

But you haven't fully answer my questions. When was a complete tune-up done and have you checked the throttle body or the accelerator linkage? None of these would necessarily show up in a scan.

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4 hours ago, iRage said:

But you haven't fully answer my questions. When was a complete tune-up done and have you checked the throttle body or the accelerator linkage? None of these would necessarily show up in a scan.

No. Tune-up not done. It's an E throttle. No mechanical linkage. 

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18 hours ago, aamarakoon said:

No. Tune-up not done. It's an E throttle. No mechanical linkage. 

So that leaves open the possibility of the throttle body itself (getting stuck) or the accelerator and throttle position sensors going bad. Depending on what is wrong with the sensor it might not have been logged in the ECU as well.

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