Corolla XLI 2011 Acceleration problem

[bossthecall]

Hi,
We have Toyota Corolla 2011 model (facelift). The car have insanely low acceleration compared to other Gli's same shape/model i've driven. So we went to mechanic He
* Cleaned up butter fly
* Catalytic converted is removed
* plugs are changed
* changed fuel filter
* serviced ejectors
* changed airfilter

Acceleration was still same as before (A minor change but unnoticeable).
So a week after that Fuel Pump of car stopped working, I had to call mechanic he changed the fuel pump and installed fuel pumb from a company called DENSO. (I HAVE NO IDEA WHAT FUEL PUMP WAS INSTALLED BEFORE AS WE BOUGHT USED CAR)
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Acceleration issue was still there. So I went to yet another mechenic he asked us to get Advancer changed. We did.. After that we noticed a bit increase but still its not satisficatory.
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1. And also i noticed rattling sound when i accelerate quickly from low RPM (2000-2500) car pickups slowly but makes rattling sound or maybe its knocking or something. Only if i press accelerator alot in, if i slowly depress the accelerator sound is not there.

1. Also car is giving pretty low average (about 9 KM/l -10KM/l)

2. Check light is NOT on.

3. Mileage is about 140,000 Kms
   .

NOW please tell me what to get changed or checked next?
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THE VIDEO IS OF TODAY AFTER THAT ALL DONE WITH FULL ACCELERATOR(80 KMH to 100 KMH in 5th Gear)

[asad1]

As its on CNG before and the mileage is almost 150k most probably the valve has done thier life

[bossthecall]

Maybe.
Is there any way to confirm it?

[Ashhad4]

I dont think 2011 model corollas have catalytic converter. Secondly, get it properly checked from 3S. Get the issue diagnosed first before changing parts on the suggestion of ustaads.

[abdkhan2]

Is there any vibration?

[bossthecall]

Yeah There is viberation specially at speed 100-120 kmh. And also when applying slight brake at these speeds. i think these are due to improper alighnment

[bossthecall]

They have catalytic converter.
These center are in karachi and i am waiting for trip to karachi as we live in mirpurkhas.

I thought i might be mistaken acceleration might be fine, then i today took two of our relatives to have a try. They also said same acceleration is very very low.

[abdkhan2]

Engine vibration on idle?

[bossthecall]

Nope, no vibration at idle.

[abdkhan2]

They valves and tappet are fine, it might be fuel pump.

[bossthecall]

Great to hear.
So whats the best fuel pump to change? Qabuli??

[rajaahmed96]

Best is to check it through scanner it will show exact situation of throttle injector and fuel pump

[shoaib657]

Go for compression test to check engine life

[Ashhad4]

I have the same model corolla and it doesn’t have cat converter. Well, get the issue diagnosed first before changing or removing any part. There are dealerships in Hyderabad too, get it checked from them as it near mirpurkhas, it will be convenient for you. When did you changed its engine oil and what about periodic maintenance?

[abdkhan2]

Get it scan and share date, it will cost u 500rs from any efi mech

[bossthecall]

Always oil chanced at 3000-3500 Km's.
Okay, so within a week will go to get it scanned. Will share the result.

[saaqie786]

Salam bro. I had same problem with my 2009 xli. After having certain experiments from different ustads and efi mechanics, the problem was diagnosed as malfunctioning of throtle body. I replaced one with kabuli one costing 2000 rs of throtle body and 500 rs of labour charges. Now i am satisfied and my car is responding good at accelerator

[Ashhad4]

Sure, your problem will be diagnosed most probably.

[bossthecall]

Oh okay, Thanks for telling me i will take a look at throttle body too.
Can you please tell in detail what problems were you facing exectly? Were they same as mine?

[saaqie786]

Yes. Same problem as with urs