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Thread: Corolla 03 running rich!

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    Default Corolla 03 running rich!

    Assalamulaikum.

    I'd like to share an issue that I'm facing with my corolla 03 (1.3 2nz-fe). The car has been running rich for the past few months. I've observed the following,

    1. Black smoke from the exhaust at mid to high rpms,
    2. Alot of smell of un-burnt fuel from the exhaust,
    3. Slightly erratic idle without the ac running. It idles at 1k rpm with the ac and is stable. Without it, while driving, when slowing down and bringing the car into neutral, the rpm sometimes drops below 400 giving you the feeling that the engine is about to stall and then comes back up to 700-750.
    4. Very poor fuel average. (Consumes fuel like a v8 except that it doesnt get you anywhere as fast as a v8 - its giving around 7-8km/ lit with a VERY light foot).
    5. Slightly sluggish at the lower rpm range.
    6. The car has around 270k km on the clock.

    Now the things that I've already checked.

    1. Checked the injectors for leakage and cleaned them. They're fine and dont leak. The spray pattern is uniform too.
    2. Checked for vacuum leaks (the carburetor cleaner method).
    3. Recently replaced the fuel filter.
    4. Got the car hooked up to an OBDII scanner without any error codes. Too bad though that the scanner isnt working now for some reason or I would've posted a screen shot of the observations.

    Now, I've looked up remedies online and the suggestions point to a faulty coolant temperature sensor. To test the sensor, I've taken voltage readings on it when the engine was warm (operating temperature) and it showed 0.5V. I have yet to check the reading with the engine cold and warm enough for the fan to come on automatically.
    When the scanner was connected to it, I observed the coolant temperature to reach 97 degree C when the fan turned on. Is that the normal temperature for the fan to turn on?


    I would be very grateful if anybody can help me solve this issue as its becoming annoying now and with the cost of fuel these days, very expensive to run too. @Xulfiqar your input on this would be much appreciated.

    P.s. Sorry for the long write up. Had to let everybody in on all the clues And btw the car doesnt have cng installed.


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    97c seems fine for the fan to operate
    can it hv anything to do with cam timing
    Life is short and very unpredictable just like a Quarter mile .....

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    @hash4u What could cause an altered timing? Since the timing is not manually adjustable.

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    Any response from the members would be appreciated...

    Sent from my HTC One S using PakWheels Forums mobile app

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    Have you checked its MAF sensor visually ?
    The best car safety device is a rear-view mirror with a cop in it.

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    The XLi/GLi Have This Issue That From No Where They Started Behaving Strange And Dumping A Lot Of Fuel.....!

    Have You Test Check Your Coil packs????? Also Check Your Main Load Sensors....MAF/TPS....It Don't Have O2 Sensor I Guess But Have A Variable Resistor In Place.....!

    Check All These Things.........All The Sensor Readings To ECU Should Be Normal.....!

    I Don't Know About 2nZ-Fe Coolant Operating Temp But As I Know......97 Is On High Side......100 Is Boiling Point....! It Should Be Under 90's
    TOYOTA Sprinter 86- AE80 DOHC 20v'D TOYOTA Corolla 98- AE101 4AFE 16v

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    If This Thing Still Behave Same........Its Your ECU....Physically Check It....Or I Would Have Hook VAFC 2 With It And Wideband And Lean Adjust The AFR's To Desired Levels.....LOL

    Easy Way Out....
    TOYOTA Sprinter 86- AE80 DOHC 20v'D TOYOTA Corolla 98- AE101 4AFE 16v

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    check the injector duty cycle and check that the injectors are not leaking themselves.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Thank you for the responses.
    @waqar19. Yes I've checked the maf sensor visually and its intact.
    @SER_GTR. How would I test the MAF and the TPS? About the temperature, that's what had me concerned too. I opened up the coolant temperature today and tried on two different ones from a local kabariya. With one of them, the car behaved the same way while the other one caused it to become even richer. So I cleaned off the residue on the original sensor and put it back in. And come to think of it, VAFCII is not a bad idea but I'd like to fix the car with the stock setup
    @Xulfiqar. I pressure tested the injectors individually for leaks by placing them in a pipe filled with carb cleaner and then pressurizing them with compressed air, in short, the injector cleaning method and they did not show any leakages. For the duty cycle, I tested each injector by connecting an led to the injector grips. Is that the right method?

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    You need To Look For Their Readings To ECU....You Need To Follow Manual......! Look For Manual And Check For Their Appropriate Reading.....!
    TOYOTA Sprinter 86- AE80 DOHC 20v'D TOYOTA Corolla 98- AE101 4AFE 16v

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    Yes.....Have Patience And Check Every Sensor Hooked Up With ECU........You Will Find Something....If You Don't.....Its ECU I Say...!
    TOYOTA Sprinter 86- AE80 DOHC 20v'D TOYOTA Corolla 98- AE101 4AFE 16v

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    check it valves clearance? r plugs oily or dry?

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    @SER_GTR I guess i'll have to find a way to get the scanner working and then will report back here.


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    @wasay_ahmed. I changed the plugs a couple of weeks back. The plugs were dry when i took them out.

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    Use A Proper Scanner...Don't Use Crappy Scanners Which Tells You Lame Results...
    TOYOTA Sprinter 86- AE80 DOHC 20v'D TOYOTA Corolla 98- AE101 4AFE 16v

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    @SER_GTR I've arranged for a guy whose working on the other car to attach his scanner which I think is a Tech 2. Lets see what shows up.

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    B.t.w....How Many Miles It Does And Ever RUN On CNG Before????

    Did You Compression Test The Motor?????
    TOYOTA Sprinter 86- AE80 DOHC 20v'D TOYOTA Corolla 98- AE101 4AFE 16v

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    Quote Originally Posted by Owais_Yunus View Post
    Thank you for the responses.
    @waqar19. Yes I've checked the maf sensor visually and its intact.
    @SER_GTR. How would I test the MAF and the TPS? About the temperature, that's what had me concerned too. I opened up the coolant temperature today and tried on two different ones from a local kabariya. With one of them, the car behaved the same way while the other one caused it to become even richer. So I cleaned off the residue on the original sensor and put it back in. And come to think of it, VAFCII is not a bad idea but I'd like to fix the car with the stock setup
    @Xulfiqar. I pressure tested the injectors individually for leaks by placing them in a pipe filled with carb cleaner and then pressurizing them with compressed air, in short, the injector cleaning method and they did not show any leakages. For the duty cycle, I tested each injector by connecting an led to the injector grips. Is that the right method?
    the noid light (LED) is for testing pulse output to the injector, duty cycle is tested from a live scanner in which you can see the output of the ECU to the injectors, if that goes messed up your engine may flood with fuel. btw I once came across such a problem in a Vitz, it was a piece of natural fibre stuck between the sense filaments of the MAF sensor. If you see it too, handle it extremely carefully, you dont want to break those filament wires.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    @SER_GTR It used to run about 7-8km/l and that too with a very light foot. Havent checked the compression, though the engine still performs the way it used to years back.


    Thank you all for your kind responses. I've changed the MAF sensor and the car is not running rich any more. I'll drive it for about a week and report here how it's doing on fuel and if it stays well with the replaced MAF sensor

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    @Xulfiqar. I checked the MAF sensor physically. Though it did not have any issues with it physically but upon replacing it, it seems to have fixed the issue. It did not show a CEL related to the MAF sensor though with the old sensor.

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