Vitz long self

[imrananr]

[spiderman-17]

If i press accelerator and start it starts immediately.

That can give you some indication for your problem

1) fuel starvation, it could be that the fuel pump is not delivering the fuel necessary to start the engine, when you press the acceleratior more fuel goes into the cylinder and thats why it starts
2) bad or dirty MAP sensor, not correctly detecting the air pressure going through the throttle body, thus supplying less fuel into the cylinders. are you getting good fuel economy? (+13km/ltr in city)
3) dirty plugs or worn out plug cables
4)low octane in fuel. Low octane fuel detonates faster then hi octane fuel so it detonates before the piston reaches top dead centre and thats why engine vibrates on low idle (premature combustion chamber explosions) the ecu tries to compensate for these but depends of the data given to him from the knock sensor
5)low battery cold start amperes. The engine needs a good kickstart especially when cold. If it is not getting this it will take longer to start

Ignore 02 sensors at this stage because the ecu starts the engine at what is called open loop (it does not try to deliver a lambda value of 1.0 or 14.7:1 air/fuel ratio) because 02 sensors don't deliver data when cold, when they are hot enough (very hot) they start to deliver voltage variations to ecu, then ecu goes to close loop but it can take 2-3 minutes ecpecially with non heated sensors

@imrananr .. Thanks!

[usman_arooq2]

Ap to gusa hi kar gae
App pa to nahi hans raha tha
Why you take it wrong
I never ever suggest to clean radiator with distaled water
Read again complete
Ap jo others ki bat karhe the us pa lollz kaha tha


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Kerosene oil won't do nothing to rust. better use soda or citric acid solution(can't remember exactly but @xulfiqar has posted the procedure multiple times) and flush it multiple times with distilled water than add coolant mix.

[m_umairr]

That can give you some indication for your problem

1) fuel starvation, it could be that the fuel pump is not delivering the fuel necessary to start the engine, when you press the acceleratior more fuel goes into the cylinder and thats why it starts

This could be the issue, i feel fuel pump is faulty and is responsible for this behaviour. Not sure though.
2) bad or dirty MAP sensor, not correctly detecting the air pressure going through the throttle body, thus supplying less fuel into the cylinders. are you getting good fuel economy? (+13km/ltr in city)

I get approximately 13 km/l in city with AC. I did clean MAP sensor myself after servicing throtle body(Not to mention, i do tuning myself other than the computer, as i don't have a scanner)
3) dirty plugs or worn out plug cables

Plugs are only 3 months old and are regularly cleaned.
4)low octane in fuel. Low octane fuel detonates faster then hi octane fuel so it detonates before the piston reaches top dead centre and thats why engine vibrates on low idle (premature combustion chamber explosions) the ecu tries to compensate for these but depends of the data given to him from the knock sensor

I always try to mix Hi-Octane with super fuel, but i have not been able to find it lately easily. I would like to mention here that problem arose when i poured two tanks of hi octane continously, it was okay before though.
5)low battery cold start amperes. The engine needs a good kickstart especially when cold. If it is not getting this it will take longer to start
Battery is okay, no carbon yet. water level is okay and indications are okay too.
Ignore 02 sensors at this stage because the ecu starts the engine at what is called open loop (it does not try to deliver a lambda value of 1.0 or 14.7:1 air/fuel ratio) because 02 sensors don't deliver data when cold, when they are hot enough (very hot) they start to deliver voltage variations to ecu, then ecu goes to close loop but it can take 2-3 minutes ecpecially with non heated sensors
For my satisfaction, i changed O2 sensor though.

@imrananr .. Thanks!

One thing I need to confirm, is there any second catalytic converter beneath the vehicle? I have heard mixed opinions about it. Some people say there is a second catalytic converter just beneath driver seat also other than the primary CC that is adjacent to Engine?

[rajaatta]

No soloution till now to your problem??

[spiderman-17]

One thing I need to confirm, is there any second catalytic converter beneath the vehicle? I have heard mixed opinions about it. Some people say there is a second catalytic converter just beneath driver seat also other than the primary CC that is adjacent to Engine?

There is 1 cat convertor in your car because ther is 1 bank of cylinders (cyl 1,2,3) monitored by 1 pre and 1 post Oxygen sensors, besides it doesn't make sense to put 2 cats in series on 1 exaust pipe

Eg: A typical V6 engine will have 2 because it has 2 banks of cylinders (bank 1 will have cyl 1,2,3 whilst bank 2 will have cyl 4,5,6). It will also have 4 O2 sensors (2 on each bank) This is just an example because there are varations in v6, v8 engines.

Hope i explained it well

[imrananr]

No soloution till now to your problem??

I don't think it's a problem. I thinks he's over anxious with this minor thing of long cranking to start the engine, that also occasionally. Just an opinion. No offence.

[m_umairr]

There is 1 cat convertor in your car because ther is 1 bank of cylinders (cyl 1,2,3) monitored by 1 pre and 1 post Oxygen sensors, besides it doesn't make sense to put 2 cats in series on 1 exaust pipe

Eg: A typical V6 engine will have 2 because it has 2 banks of cylinders (bank 1 will have cyl 1,2,3 whilst bank 2 will have cyl 4,5,6). It will also have 4 O2 sensors (2 on each bank) This is just an example because there are varations in v6, v8 engines.

Hope i explained it well

How come i hear people having two cats and breaking the second one for better performance?
It just doesn't make sense!

For a reference, check it out:
https://www.pakwheels.com/forums/vitz-yaris/222865-toyota-vitz-choked-cat-removal-noise-solution-after-cat-removal-2

[spiderman-17]

How come i hear people having two cats and breaking the second one for better performance?
It just doesn't make sense!

For a reference, check it out:
https://www.pakwheels.com/forums/vitz-yaris/222865-toyota-vitz-choked-cat-removal-noise-solution-after-cat-removal-2

I think u 'maybe' did not understand what he did in the link you posted

He said (and I quote) "Removed CAT con after drivin 70k kms, and after that installed additional DHOLKI to reduce noise whhich comes after CAT"

So he removed the catalytic converter and installed an extra engine noise suppressor (i don't know what DHOLKI is) to compensate (reduce noise) for the lack of cat. Convertor. (somthing I don't recommend)

I am starting to beleive that pak has many mechanical engineers, but I could be wrong

[m_umairr]

I think u 'maybe' did not understand what he did in the link you posted

He said (and I quote) "Removed CAT con after drivin 70k kms, and after that installed additional DHOLKI to reduce noise whhich comes after CAT"

So he removed the catalytic converter and installed an extra engine noise suppressor (i don't know what DHOLKI is) to compensate (reduce noise) for the lack of cat. Convertor. (somthing I don't recommend)

I am starting to beleive that pak has many mechanical engineers, but I could be wrong

He surely said that. But did you see the pictures? He never did anything in the engine bay, infact beneath the vehicle?
"Dholki" is what we call round cylinder thing in exhaust pipe in urdu

[spiderman-17]

He surely said that. But did you see the pictures? He never did anything in the engine bay, infact beneath the vehicle?
"Dholki" is what we call round cylinder thing in exhaust pipe in urdu

Yes, I did.
In pic 3 with title 'Broken cat con' you can see the mix of precious metals. Platinum and others unfortunatly lying on the floor. He emptied (distroyed) his cat from under the car. (Pic 2)

[m_umairr]

Yes, I did.
In pic 3 with title 'Broken cat con' you can see the mix of precious metals. Platinum and others unfortunatly lying on the floor. He emptied (distroyed) his cat from under the car. (Pic 2)

So you agree there is a cat underneath?

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[spiderman-17]

So you agree there is a cat underneath?

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NO,
The cat is in front of the engine in a vertical position, you can see the bottom of it in pic 2

[imrananr]

So you agree there is a cat underneath?

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Umirr, DHOLKI or silencer is not cat. conv. Do not confuse CAT. With DHOLKI. They are separate; both are on the exhaust piping from engine exhaust till tail pipe.

[faizanali]

@spiderman-17, I would like to say sorry for this poor attitude of @faizanali. We Pakistanis are very poor in listening to others and justifying our point with logic.

The thing Spider linked with me its never ever recommend by me actuly [emoji16]

Any ways be happy and relax every one

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[walls]

Have you got your problem resolved?

Do share if problem is resolved

[rajaatta]

There is 1 cat convertor in your car because ther is 1 bank of cylinders (cyl 1,2,3) monitored by 1 pre and 1 post Oxygen sensors, besides it doesn't make sense to put 2 cats in series on 1 exaust pipe

Eg: A typical V6 engine will have 2 because it has 2 banks of cylinders (bank 1 will have cyl 1,2,3 whilst bank 2 will have cyl 4,5,6). It will also have 4 O2 sensors (2 on each bank) This is just an example because there are varations in v6, v8 engines.

Hope i explained it well

In modern jdm vehicle's 2 or 3 cats in row are common due to strict emission checks. The efficiency of the primary cat is monitored only via a post cat sensor.

[imrananr]

The thing Spider linked with me its never ever recommend by me actuly [emoji16]

Any ways be happy and relax every one 

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Some times it's difficult to crack a 'NUT'.

[spiderman-17]

In modern jdm vehicle's 2 or 3 cats in row are common due to strict emission checks. The efficiency of the primary cat is monitored only via a post cat sensor.

Agree 100%, I saw some in my country (2 in line) but the engine was > 1500cc, never saw a sub 1000cc with 2 cats inline. I saw a sub 1000cc Euro 6 but it was with one (but a bit longer then the vitz

[m_umairr]

Have you got your problem resolved?

Do share if problem is resolved

Not yet brother.. Still figuring out the issues

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