Vitz long self

[m_umairr]

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.

I suspect vitz late 2nd gen has a 2 stage catalytic converter.. Just need to confirm it it is the case

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[m_umairr]

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.

Imran i do und that not every dholki contains cat.

Did you check our the pw posts i referenced to spider? I suspect vitz has a 2 stage cat converter.. One of the toyota guy confirmed it to me.. Though he isn't with toyota anymore.

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[fahad4434.ali]

I am also facing the same issue in my Vitz, only 15k kms genuinely driven its a 2015 manufactured, previously it was perfect, i used pure hobc many times but the very last time when I got my oil changed and poured in hobc, my car started to taking longer time spans to start like 3-4 seconds. Maybe because I also washed the engine with water. And also can it be a battery issue because once someone left the light inside the car turned on for a day.

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[imrananr]

I am also facing the same issue in my Vitz, only 15k kms genuinely driven its a 2015 manufactured, previously it was perfect, i used pure hobc many times but the very last time when I got my oil changed and poured in hobc, my car started to taking longer time spans to start like 3-4 seconds. Maybe because I also washed the engine with water. And also can it be a battery issue because once someone left the light inside the car turned on for a day.

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Use 60/40 ratio HOBC and supreme and your issue will be resolved. But, don't worry if it takes long self (single self) to start. I would still prefer pure 100% HOBC over mixed ones.

[imrananr]

I am also facing the same issue in my Vitz, only 15k kms genuinely driven its a 2015 manufactured, previously it was perfect, i used pure hobc many times but the very last time when I got my oil changed and poured in hobc, my car started to taking longer time spans to start like 3-4 seconds. Maybe because I also washed the engine with water. And also can it be a battery issue because once someone left the light inside the car turned on for a day.

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Use 60/40 ratio HOBC and supreme and your issue will be resolved. But, don't worry if it takes long self (single self) to start. I would still prefer pure 100% HOBC over mixed ones.

[imrananr]

Imran i do und that not every dholki contains cat.

Did you check our the pw posts i referenced to spider? I suspect vitz has a 2 stage cat converter.. One of the toyota guy confirmed it to me.. Though he isn't with toyota anymore.

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Vitz has one CAT as far as I know. It's only 1000cc (3-cylinders) mostly in Pak.

[kkoool]

I dont know why people opt for HOBC when your car is designed for Super 87 Ron Etc. Most of the HOBC is just leaded Super
Say good bye to your catalysts and valves earlier than their time period.
I have personally experienced a choked catalyst on Reborn 2008 at 60,000km due to constant use of HOBC and another reborn has ran over 120,000km on Regular fuel without any choked CAT.

If your having knocking issues, use proper Fuel from a good petrol pump not just any that you find on road. Use proper oil, recommended spark plugs only

[imrananr]

I dont know why people opt for HOBC when your car is designed for Super 87 Ron Etc. Most of the HOBC is just leaded Super
Say good bye to your catalysts and valves earlier than their time period.
I have personally experienced a choked catalyst on Reborn 2008 at 60,000km due to constant use of HOBC and another reborn has ran over 120,000km on Regular fuel without any choked CAT.

If your having knocking issues, use proper Fuel from a good petrol pump not just any that you find on road. Use proper oil, recommended spark plugs only

Well, the minimum octane fuel rating for JDM vehicles is 90+. Since we see new vehicles with higher compression ratios, 10.5:1 and above, RON 87 is too less for that matter. HOBC sold in Pakistan is around RON 91, perfect for imported vehicles with high compression ratio engines.

Higher octane rated fuel has nothing to do with choking of CAT and valves.

[kkoool]

Well, the minimum octane fuel rating for JDM vehicles is 90+. Since we see new vehicles with higher compression ratios, 10.5:1 and above, RON 87 is too less for that matter. HOBC sold in Pakistan is around RON 91, perfect for imported vehicles with high compression ratio engines.

Higher octane rated fuel has nothing to do with choking of CAT and valves.

The first sign of sticking valves is experienced during morning when the engine is cold and valve clearances are less, keep on blending the 60:40 50:50 30:70 ratios and ruin your CAT and valves, first try to get the Lead out of HOBC or you have a perfect recipe of deposits around valves due to increased temp in combustion chamber.

"aagay aap ki marzi bhai"

What I am trying to say is that HOBC in Pakistan is not mostly HOBC, so beware, the pumps / refineries here are experts in adding other things in fuel as well.

[rkbladex]

I suspect vitz late 2nd gen has a 2 stage catalytic converter.. Just need to confirm it it is the case

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I think the Problem is related to fuel so you need to check the whole fuel system like Restricted in tank Fuel filter, Fuel Pump, Fuel Pressure Regulator, clogged Fuel line if any so i am also facing this issue so my opinion is the problem is fuel pressure. So i read on internet EFI cars runs on high fuel pressure i don't know how much it is correct.

• RKBladeX

[m_umairr]

I think the Problem is related to fuel so you need to check the whole fuel system like Restricted in tank Fuel filter, Fuel Pump, Fuel Pressure Regulator, clogged Fuel line if any so i am also facing this issue so my opinion is the problem is fuel pressure. So i read on internet EFI cars runs on high fuel pressure i don't know how much it is correct.

- RKBladeX

If this was the case, why 2 fuel pumps burned out? I recently changed fuel filter and fuel pump but it is of no use at all..
I am unable to trace out issue

as a progress note, i opened my o2 sensor(exhaust pipe one) and cleaned it with nasa oxygen sensor cleaner i feel long selfs are now history.. But need to confirm for a day or two for confirmation..

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[m_umairr]

I think the Problem is related to fuel so you need to check the whole fuel system like Restricted in tank Fuel filter, Fuel Pump, Fuel Pressure Regulator, clogged Fuel line if any so i am also facing this issue so my opinion is the problem is fuel pressure. So i read on internet EFI cars runs on high fuel pressure i don't know how much it is correct.

- RKBladeX

If this was the case, why 2 fuel pumps burned out? I recently changed fuel filter and fuel pump but it is of no use at all..
I am unable to trace out issue

as a progress note, i opened my o2 sensor(exhaust pipe one) and cleaned it with nasa oxygen sensor cleaner i feel long selfs are now history.. But need to confirm for a day or two for confirmation..

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[spiderman-17]

as a progress note, i opened my o2 sensor(exhaust pipe one) and cleaned it with nasa oxygen sensor cleaner i feel long selfs are now history.. But need to confirm for a day or two for confirmation..

I doubt you will solve long selfs by cleaning an O2 sensor only, because:

1) o2's are not used during igniton in a vitz, (already explained this in a previous post in this thread)

2) you never actually clean an o2 sensor because the sensor is encapsulated in a metal shield to protect the sensor itself from carbon etc. So you cleaned the sensor protection shield. This shield can be dirty and the sensor still reads correct oxygen because oxygen is a gas not a Liquid. If this sensor was a thermostat (sensing liquid, then cleaning will improve the reading). O2's (like everything) have a lifespan, when it expires, you replace it

On the bright side, you could have found an air leak, which you fixed by re tightening the o2

[m_umairr]

I doubt you will solve long selfs by cleaning an O2 sensor only, because:

1) o2's are not used during igniton in a vitz, (already explained this in a previous post in this thread)

2) you never actually clean an o2 sensor because the sensor is encapsulated in a metal shield to protect the sensor itself from carbon etc. So you cleaned the sensor protection shield. This shield can be dirty and the sensor still reads correct oxygen because oxygen is a gas not a Liquid. If this sensor was a thermostat (sensing liquid, then cleaning will improve the reading). O2's (like everything) have a lifespan, when it expires, you replace it

On the bright side, you could have found an air leak, which you fixed by re tightening the o2

Very informative spider​ thanks a lot

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[fahad4434.ali]

Surprisingly after I topped the car with unleaded fuel yesterday and started it today morning it started within a second compared to hobc which took 2-3 seconds, so I guess pure hobc is not a good choice. Is 60:40 fine? Hobc:super.

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[walls]

I doubt you will solve long selfs by cleaning an O2 sensor only, because:

1) o2's are not used during igniton in a vitz, (already explained this in a previous post in this thread)

2) you never actually clean an o2 sensor because the sensor is encapsulated in a metal shield to protect the sensor itself from carbon etc. So you cleaned the sensor protection shield. This shield can be dirty and the sensor still reads correct oxygen because oxygen is a gas not a Liquid. If this sensor was a thermostat (sensing liquid, then cleaning will improve the reading). O2's (like everything) have a lifespan, when it expires, you replace it

On the bright side, you could have found an air leak, which you fixed by re tightening the o2

Where is this o2 located?
It can be done d.i.y ?

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[spiderman-17]

Where is this o2 located?
It can be done d.i.y ?

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There are 2, one before the catalytic converter and one after

For the DIY, it depends what you want to do. BUT, as the old saying says, if it's not broken don't fix it.

[DUDE007]

There are 2, one before the catalytic converter and one after

For the DIY, it depends what you want to do. BUT, as the old saying says, if it's not broken don't fix it.

Did you do any changes to your car before shifting from 87 RON to 98(correct if wrong)? i wonder why people here face issues running HOBC in vitz.

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[spiderman-17]

Did you do any changes to your car before shifting from 87 RON to 98(correct if wrong)? i wonder why people here face issues running HOBC in vitz.

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I shifted from what was in the car when i got it from japan to 1 tank of ron 95 and then always used 98. I Didn't do any thing to the car, even though there is only 3% increase in RON, i got a clean/smoother ride and some 1.75 kms increase in milage

I don't know what's in HOBC in Pakistan (and would like to know) but the vitz is made, and programmed to run on unleaded fuel, thus leaded fuel is harmful to the engine especially valves

[walls]

There are 2, one before the catalytic converter and one after

For the DIY, it depends what you want to do. BUT, as the old saying says, if it's not broken don't fix it.

Actuly my car also take long self.. but not regularly
Once in a week
May be my car o2 sensor also need to be clean
Thats why asking [emoji1] [emoji2]