Pls house i need more experience bcs I'm right now Confused...I'm using Toyota sienna space bus bt d problem with it is highly consumption of fuel....After diagnosing it...d culprits was spark plug and injector mouth, After changing those....I'm still nt satisfied with d result...ever since then evry mechanic do tell me to buy catalyst of which i did....But real concern now is that i should av leav it as it was before buying catalyst....the vehicles is running smoothly but consuming much fuel after putting cat.....someone now advised to remove cat and leav it empty so see d different...and after removing it d fuel nw come back to normal..... my question now is ..... Is Catalyst converter Overhyped or is it working differently with d system of cars?.....pls i jst wnt to learn o

Catalyst converter convert dirty air from engine combustion cabon monoxide that will kill you to to clean air CO2 and H2O

FROM ENGINE TO EXHAUST PIPE

CO+HC+NOX= CO2+N2+H2O

CocoaOla:
Catalyst converter convert dirty air from engine combustion cabon monoxide that will kill you to to clean air CO2 and H2O

FROM ENGINE TO EXHAUST PIPE

CO+HC+NOX= CO2+N2+H2O

..... so, it doesn't affect fuel consumption

Bosun13:
Pls house i need more experience bcs I'm right now Confused...I'm using Toyota sienna space bus bt d problem with it is highly consumption of fuel....After diagnosing it...d culprits was spark plug and injector mouth, After changing those....I'm still nt satisfied with d result...ever since then evry mechanic do tell me to buy catalyst of which i did....But real concern now is that i should av leav it as it was before buying catalyst....the vehicles is running smoothly but consuming much fuel after putting cat.....someone now advised to remove cat and leav it empty so see d different...and after removing it d fuel nw come back to normal..... my question now is ..... Is Catalyst converter Overhyped or is it working differently with d system of cars?.....pls i jst wnt to learn o

Original catalytic converter is expensive the one you fix might be choking blocking your engine from breathing properly forcing the engine to suck more fuel in order not to stall

Bosun13:
..... so, it doesn't affect fuel consumption

Yes sir except the cat is blocked

CocoaOla:
Yes sir except the cat is blocked

...thanks ...i will continue using my car without catalyst for now ...i will remove the cat

Bosun13:
...thanks ...i will continue using my car without catalyst for now ...i will remove the cat

..i will put net or straight pipe as advised

Bosun13:
Pls house i need more experience bcs I'm right now Confused...I'm using Toyota sienna space bus bt d problem with it is highly consumption of fuel....After diagnosing it...d culprits was spark plug and injector mouth, After changing those....I'm still nt satisfied with d result...ever since then evry mechanic do tell me to buy catalyst of which i did....But real concern now is that i should av leav it as it was before buying catalyst....the vehicles is running smoothly but consuming much fuel after putting cat.....someone now advised to remove cat and leav it empty so see d different...and after removing it d fuel nw come back to normal..... my question now is ..... Is Catalyst converter Overhyped or is it working differently with d system of cars?.....pls i jst wnt to learn o

.
I will advice you to visit this thread and learn
https://www.nairaland.com/5265973/danger-driving-car-p0420-check

Bosun13:
..i will put net or straight pipe as advised

Don't put net to avoid choking your engine to death , you can decide to leave it hollow .

autologic:

Don't put net to avoid choking your engine to death , you can decide to leave it hollow .

...thanks bro

Bosun13:
Pls house i need more experience bcs I'm right now Confused...I'm using Toyota sienna space bus bt d problem with it is highly consumption of fuel....After diagnosing it...d culprits was spark plug and injector mouth, After changing those....I'm still nt satisfied with d result...ever since then evry mechanic do tell me to buy catalyst of which i did....But real concern now is that i should av leav it as it was before buying catalyst....the vehicles is running smoothly but consuming much fuel after putting cat.....someone now advised to remove cat and leav it empty so see d different...and after removing it d fuel nw come back to normal..... my question now is ..... Is Catalyst converter Overhyped or is it working differently with d system of cars?.....pls i jst wnt to learn o

of all the diagnosis you didn't scan the car which would really tell you what issue you have. Your O2 sensors maybe faulty or non existent.

SCAN VEHICLE FIRST AND FIX ERROR CODES

nurey:


of all the diagnosis you didn't scan the car which would really tell you what issue you have. Your O2 sensors maybe faulty or non existent.

SCAN VEHICLE FIRST AND FIX ERROR CODES

....av done that already bro...it was injector mouth and plug after that i realized the fuel still on high side...d mechanics later advise to get catalyst bcs my car doesn't av one ,i spent almost 40k to get cat...after getting cats i diagnosed again and d result of test was perfect but still more higher on fuel consumption..mind u b4 i put cats it was me that not satisfy bt after putting cats its more wost that b4...thats what brought d questions overhere. ..does catalyst work differently interms of engine system

When i cut catalyst out.. the fuel consumption back to normal that's y I'm asking weather catalyst is Overhyped

Bosun13:
When i cut catalyst out.. the fuel consumption back to normal that's y I'm asking weather catalyst is Overhyped

catalyst removal increases back pressure which is supposed to lead to fuel economy gain. which sienna generation is this? cause I haven't seen scan tool detect injector mouth faulty.

I understand the plugs but ensure you replace with original plug not all those NGK New sold at 1k or tokunbo.

change your air filter and clean your throttle body, also ensure the throttle cable is in default position shouldn't exceed 800rpm when engine is loaded I.e when engine is warm and gear in drive position.

Then buy full tank and use that to compare fuel economy

nurey:


catalyst removal increases back pressure which is supposed to lead to fuel economy gain. which sienna generation is this? cause I haven't seen scan tool detect injector mouth faulty.

I understand the plugs but ensure you replace with original plug not all those NGK New sold at 1k or tokunbo.

change your air filter and clean your throttle body, also ensure the throttle cable is in default position shouldn't exceed 800rpm when engine is loaded I.e when engine is warm and gear in drive position.

Then buy full tank and use that to compare fuel economy

....it is year 2000 model

Bosun13:
....it is year 2000 model

.....when i put catalyst i bought d one in the front close to manifold and the one mount under exhaust pipe but i realized whr i i used to reach with #2000 fuel I'm spending 3k and i tested it for 2wks,when i see no changes i decided to cut it out and my fuel consumption back to at it was,though the sound was loud when cat was removed

Bosun13:
.....when i put catalyst i bought d one in the front close to manifold and the one mount under exhaust pipe but i realized whr i i used to reach with #2000 fuel I'm spending 3k and i tested it for 2wks,when i see no changes i decided to cut it out and my fuel consumption back to at it was,though the sound was loud when cat was removed

That is not how to calculate fuel economy, the sienna fuel level sensor is gravity dependent and doesn't tell true value of things. if you park with the back slant than the front the sensor would tip upwards like their is more fuel.

Fuel economy is affected by other factors like

driving habit

Tyre PSI

load you are hauling

condition of other car components like air filter, throttle body, spark plug condition and leakage in the vehicle exhaust system (leakage is different from presence of catalyst)

Now we can also add engine condition and mileage the vehicle has done. mileage is about wear and year after long use just like humans when young you can have sex 5 rounds but as you age you can only do it once while engine condition is engine oil used, sludge in engine, running fan direct etc.

My question to you is

1. Is there the check engine light on your dash board?

2. What oil do you use to service and your change interval

3. Is your fan ran direct?

4. why don't you buy full tank and do the L/100km test which is easier.

NOTE: The fuel gauge of the sienna after the full is a small section (A) big section (B1) half tank then big section again (B2) then small section (C). I tested this experiment for a year with the stock tyres when I first bought my sienna, from full tank to the end of A the vehicle will give you 200km, from end of A to B1 is 150km, meaning from full tank to half tank is 350km from half tank to reserve light coming ON is 220km. Reserve is around 10 to 15L depending on debris in the fuel tank.

nurey:


That is not how to calculate fuel economy, the sienna fuel level sensor is gravity dependent and doesn't tell true value of things. if you park with the back slant than the front the sensor would tip upwards like their is more fuel.

Fuel economy is affected by other factors like

driving habit

Tyre PSI

load you are hauling

condition of other car components like air filter, throttle body, spark plug condition and leakage in the vehicle exhaust system (leakage is different from presence of catalyst)

Now we can also add engine condition and mileage the vehicle has done. mileage is about wear and year after long use just like humans when young you can have sex 5 rounds but as you age you can only do it once while engine condition is engine oil used, sludge in engine, running fan direct etc.

My question to you is

1. Is there the check engine light on your dash board?

2. What oil do you use to service and your change interval

3. Is your fan ran direct?

4. why don't you buy full tank and do the L/100km test which is easier.

NOTE: The fuel gauge of the sienna after the full is a small section (A) big section (B1) half tank then big section again (B2) then small section (C). I tested this experiment for a year with the stock tyres when I first bought my sienna, from full tank to the end of A the vehicle will give you 200km, from end of A to B1 is 150km, meaning from full tank to half tank is 350km from half tank to reserve light coming ON is 220km. Reserve is around 10 to 15L depending on debris in the fuel tank.

.....thanks alot my brother,i realy appreciate how u dedicate your time for me to let me learn more abt my car,God will be with you in all your endeavors (amen).

nurey:


That is not how to calculate fuel economy, the sienna fuel level sensor is gravity dependent and doesn't tell true value of things. if you park with the back slant than the front the sensor would tip upwards like their is more fuel.

Fuel economy is affected by other factors like

driving habit


Tyre PSI

load you are hauling

condition of other car components like air filter, throttle body, spark plug condition and leakage in the vehicle exhaust system (leakage is different from presence of catalyst)

Now we can also add engine condition and mileage the vehicle has done. mileage is about wear and year after long use just like humans when young you can have sex 5 rounds but as you age you can only do it once while engine condition is engine oil used, sludge in engine, running fan direct etc.

My question to you is

1. Is there the check engine light on your dash board?

2. What oil do you use to service and your change interval

3. Is your fan ran direct?

4. why don't you buy full tank and do the L/100km test which is easier.

NOTE: The fuel gauge of the sienna after the full is a small section (A) big section (B1) half tank then big section again (B2) then small section (C). I tested this experiment for a year with the stock tyres when I first bought my sienna, from full tank to the end of A the vehicle will give you 200km, from end of A to B1 is 150km, meaning from full tank to half tank is 350km from half tank to reserve light coming ON is 220km. Reserve is around 10 to 15L depending on debris in the fuel tank.

Hello Nurey,

I've always been confused about the correlation of "running fans directly" and fuel consumption. How does these two relate?

Regards

GCFR696:


Hello Nurey,

I've always been confused about the correlation of "running fans directly" and fuel consumption. How does these two relate?

Regards

Let's take car A for example with an optimum working temp by the manufacturer pegged at 96 degrees centrigrade. So what the manufacturer does is afix that into the ECU of vehicle A in question.

The air and petrol mixture is better at the optimum temperature of the engine in question meaning any temperature less,the ECU will dump more petrol in the mixture to balance up.

The engine needs more fuel for combustion when it is cold (evident when you just started a car parked over night where the tachometer rises at 1.5 to 2000 then as engine begins to warm it drops down till it sits at 650 to 800 depending on vehicle as it reaches optimum working temperature).

GCFR696:


Hello Nurey,

I've always been confused about the correlation of "running fans directly" and fuel consumption. How does these two relate?

Regards

The average engine has an operating temperature, which is not ambient temperature.....
nurey will come with the specs...

the engine fuel management system will only function optimally when the engine has reached that optimum temperature.

the brain box will keep pumping fuel and keep a steady high rpm to make sure the engine reaches that optimum temperature fast.... so that it can use the o2 or air/fuel sensors to manage the fuel...

managing the fuel in this case means cycling the injectors to pump fuel only when needed.
the o2 sensors sense the amount of air fuel mixture in the exhaust gases and determine if it's too lean or too rich.
they send this info to the brain box which will do the injector cycling.....


now after typing all these, if your vehicle does not reach optimum temperature because ur fans are running direct, then your ecm keeps pumping fuel in hopes that it will reach optimum Temp soon.... so the whole essence of the fuel management system is defeated!

Points clearly understood.

Thanks guys

To learn more about the theory and practical effect of cooling system on fuel mileage .You can check this thread .
https://www.nairaland.com/3729134/let-discuss-cooling-system-overheating.
There is a practical experiment in that thread to scientifically prove it(Courtesy of autologic R& D team)

Honestly, I don't know about you'll but I just resolved a catalyst issue on my 2006 Camry V6 and my fuel consumption have greatly reduced.

It threw up the P0420 code, we checked the manifold catalyst and it was hollow. I had to replace the catalyst and O2 sensor and my fuel consumption have been super awesome for this past one week.

So if you ask me, a non-cat car has tendency to consume more fuel.

Ok.