Strange noise after throttle body cleaning

[abashussain]

Hello all,

I own a Corolla Ecotec 2012. I serviced my car from Toyota Capital ISB. They replaced Spark plugs, and rest of the items required for a 20K service.

Mechanic also opened throttle body and put some Petrol on a piece of cloth and told me to press the accelerator so that the butterfly in throttle body opens(as told by the mechanic) and he cleaned it. After that everything was ok but now I feel some pat-pat-pat sound (not so loud) when car accelerates from 0-20 and disappears after it. I checked it on idle but didn't hear any sound except for the Ecotec's injectors' Tar-Tar-Tar sound

Any idea guys?

thanks,

[spectra]

some rubber pipe is not properly tighetened.

[SER_GTR]

Any Loose Fittings Or Leaks.....Thoroughly Inspect Engine room And Fittings For Any Loose Pipe Fittings...!

Make Sure Nothings Is Also In Way Of Belts Or So...!

[fawadakbarkhan]

Whaaaaaaaaaaaat? Kia Kaha bhai? Butterfly in GLi 2012? :o

O teri khair, kon tha ye mechanic? O bhai I don't think your car has a butterfly. Corolla 08+ models came with electronic/ DBW throttle systems.

Aap ne kahan se butterfly saaf karwa li?

[fawadakbarkhan]

Regarding noise, I think air filter box has been left loose. Check for loose pipes or unfixed latches.

[rustam54]

Whaaaaaaaaaaaat? Kia Kaha bhai? Butterfly in GLi 2012? :o

O teri khair, kon tha ye mechanic? O bhai I don't think your car has a butterfly. Corolla 08+ models came with electronic/ DBW throttle systems.

Aap ne kahan se butterfly saaf karwa li?

Pardon me sir, but the DBW also has a butterfly controlled by a servo motor. Electronic or Driven by Cable, the butterfly area does get accumulated with dirt/carbon deposits especially when CNG is used. The OP should be grateful to the mechanic for not petrol blasting it after removal.

[fawadakbarkhan]

Pardon me sir, but the DBW also has a butterfly controlled by a servo motor. Electronic or Driven by Cable, the butterfly area does get accumulated with dirt/carbon deposits especially when CNG is used. The OP should be grateful to the mechanic for not petrol blasting it after removal.

Hmm, Thanks for the info, I learned something today. Don't have much info abt this, was told by someone that this system doesn't have the conventional butterfly gate sort of thing.

[fawadakbarkhan]

A small query Rustam Sir, the op mentioned that he pressed the gas pedal to open and close the butterfly, shouldn't this be happening with the engine running? How is that possible? Because I got the TB of R18a civic cleaned from honda and they did it in a very different way.

Pardon me sir, but the DBW also has a butterfly controlled by a servo motor. Electronic or Driven by Cable, the butterfly area does get accumulated with dirt/carbon deposits especially when CNG is used. The OP should be grateful to the mechanic for not petrol blasting it after removal.

[rustam54]

Well I wont have much information about how he did it. I have seen some ford's DBW TB youtube videos where they tried to explain zero lag between throttle plate opening and gradual peddle pressing. This was done in Ignition On position, without the engine actually started.

I wont have any say if honda (R18 / L13) or toyota allow that without crank sensor pulses.

@OP You should follow the inputs by spectra and Ser_GTR. And do update us all about the outcome.

[dms664]

A small query Rustam Sir, the op mentioned that he pressed the gas pedal to open and close the butterfly, shouldn't this be happening with the engine running? How is that possible? Because I got the TB of R18a civic cleaned from honda and they did it in a very different way.

the engine must b running I guess. Mech should have sprayed the TB or carb cleaner spray instead of petrol cloth.

[Xulfiqar]

the throttle opening is not a gradual analog motion like - 10% pedal opens 10% throttle. Its a calculation done by the ECU to "harness engine power at 10%" the throttle may open more and reel back depending on the "speed of change at the potentiometer" It also is quite peculiar with added variable valve timing, its also used to reduce pumping losses.

It wont work with no crank sensor pulses, the factory test rig can make it function though, its to test the motor and feedback circuits.

[dms664]

the engine must b running I guess. Mech should have sprayed the TB or carb cleaner spray instead of petrol cloth.

I use this at times to clean the air filter sensor n one odd times sprayed it into tb also.(engine was running n throtle pressed by anoder person)

Sir xulfiqar what is your take on this? Is it good or the petrol cloth method ?

PS got gli 2k10, my car went for 20k service recently n 3s mech said the tb is clean so no tb cleaning. May b due to this spray. Ur say plz

Sent from my HTC One V using Tapatalk 2

[Xulfiqar]

the throttle plate does not require a "bath" every now and then it can recalibrate itself if its dirty, the old types which had a separate IACV needed cleaning if the idle system failed to work.

The MAF also does not require bathing religiously, only clean when its showing fault and if it does not help then replace it with a new part.

[irfansiddique]

^ 100% correct as always . . pls dont mess with the DBW system or TB, its very sensitive and require alot of professionalism only touch it when its not performing correctly DBW system after cleaning also require CEL light cleaning through computer.

[hasan7]

Their is a butterfly in throttle body dear ........... butterfly still exist in this world.