95 Es300 Bad Gas Mileage Inspection Step By Step

[boymans]

Step 1 : Replace Spark plug

Step 2 : Replace Change Oil

Step 3 : Replace Filter

Step 4 : Replace PCV Value

Step 5 : Replace Oxygen Sensor (If I need to replace it even I dont have engine error light? )

Step 6 :

Step 7 :

Step 8 :

Step 9 :

Step 10:

Step 11:

Step 12:

Step 13:

Please help me to finish the step

Thank you very much

[boymans]

Step 1 : Replace Spark plug

Step 2 : Replace Change Oil

Step 3 : Replace  Filter

Step 4 : Replace  PCV Value 

Step 5 : Replace  Oxygen Sensor (If I need to replace it even I dont have engine error light? )

Step 6 : cleaning the MassAirFlow

Step 7 :

Step 8 :

Step 9 :

Step 10:

Step 11:

Step 12:

Step 13:

Please help me to finish the step

Thank you very much

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[amf1932]

Step 1 : Replace Spark plug

Step 2 : Replace Change Oil

Step 3 : Replace  Filter

Step 4 : Replace  PCV Value 

Step 5 : Replace  Oxygen Sensor (If I need to replace it even I dont have engine error light? )

Step 6 : cleaning the MassAirFlow

Step 7 : Check tire inflation

Step 8 :

Step 9 :

Step 10:

Step 11:

Step 12:

Step 13:

Please help me to finish the step

Thank you very much

←

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[amf1932]

Step 1 : Replace Spark plug

Step 2 : Replace Change Oil

Step 3 : Replace  Filter

Step 4 : Replace  PCV Value 

Step 5 : Replace  Oxygen Sensor (If I need to replace it even I dont have engine error light? )

Step 6 : cleaning the MassAirFlow

Step 7 : Check tire inflation

Step 8 : Check your driving habits.....accelerate smoothly with no jack rabbit starts.

Step 9 :

Step 10:

Step 11:

Step 12:

Step 13:

Please help me to finish the step

Thank you very much

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[Lexusfreak]

I'd add air filter, fuel filter, clean throttle body & make sure tire pressures are correct. B)

[Toysrme]

1 Reset the ECU

2 Check the front bank spark plugs

3 PCV

4 Check o2 sensors for responce & replace them

[mburnickas]

1 Reset the ECU

2 Check the front bank spark plugs

3 PCV

4 Check o2 sensors for responce & replace them

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I agree with you here on the 02 sensors. No need to replace if not bad.

[boymans]

How to Reset the ECU?

how to check the oxygen sensor, I found my 1995 toyota windom use 1 wire oxygen sensor. Is that right??

Thank you very much

[Toysrme]

Pull the EFI fuse a second & replace it.

[SKperformance]

Toys how does pulling the ecu fuse affect the mileage of a vehicle?

[mburnickas]

Toys how does pulling the ecu fuse affect the mileage of a vehicle?

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I must ask too.

From what I know, you pull the ECU fuse when you do make emission changes like new o2 sensors, MAF etc. Since they need to "see" the new items.

If you do nothing and think it will help, it most times will not. THe car goes back to its original logic and then learns your driving (somewhat).

Hence, you can pull fuses till you wear out the leads and till will get the same XX mpg.

[Toysrme]

Pulling the EFI fuse resets the ECU. That includes all codes & trims.

In the OBD-II's case, that includes short & long term fuel adjujstments aquired throughout the rpm ranage.

STFT is a 10% adjustment on the fly with the o2 sensors.

LTFT is another 5 - 10% adjustment.

That's a large amount of fuel that can be added, or subtracted from stock.

It happens as fuel injector springs get a little wear on them & they can't pulse fast enough & o2 sensors get wear on them.

[SKperformance]

So you are saying that the computer has not adjusted for these deviances itself or is incapable of it?

[Toysrme]

If any of the sensors are off, the fuel trim<s> will be affected.

air sensors (AFM, MAF, MAP)

coolant sensor

o2 sensor<s>

incorrect ignition timing / bad ignition

All can have a big affect with fuel trim.

Case in point, one of the free mod series I wrote about originally had you put a POT in on the coolant temp sensor. You can easily add 4-6% more long term fuel trim by making the car think it is colder than it is. That's LTFT too, that doesn't account the few extra % the STFT will add because of it.

Always reset the ECU before troubleshooting poor mileage. You never know when something might be cooky on these things as much sound cladding we have & how quiet the stock engine's are.

[daovang]

Toysrme, you are god in lexus expertise. I liked your "free mods series." Maybe will try some of them out. Just did the seafoam thing today that you had posted long before. I was scared when the car didn't turn on after 5 minutes, but after 15 minutes it turned on an worked a charm.

But...taking off useless things like amps and subs will help gas milage.

[chargerucd]

HELLO,

Just out of curiosity, what mileage doi you have now that seems too low?

CHargerUCd

Toysrme, you are god in lexus expertise. I liked your "free mods series." Maybe will try some of them out. Just did the seafoam thing today that you had posted long before. I was scared when the car didn't turn on after 5 minutes, but after 15 minutes it turned on an worked a charm.

But...taking off useless things like amps and subs will help gas milage.