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Thread: Vitz 2008 Acceleration Problem

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    Default Vitz 2008 Acceleration Problem

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    Dear Masters,
    I have Vitz 2008 which i purchased 2 months back.Initially on motorway it easily passed 130-140 speed.But after i cleaned the throttle body of my car,it is not crossing 110km mark...I also changed plugs and placed new iridium plugs of genuine quality...What can be the reason..Any guidance will be very helpful...


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    No Comments yet.......

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    Inthai thanday

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    Vitz 2004 vvti 1000cc poor acceleration issue
    Well i faced the same problem for over a month, tried everything for diagnostics, the computer gave no hint DTC was always clean. Check engine light would come sometimes but again go off upon restart. The engine itself was dull, hitting the paddle hard gave sluggish acceleration but soft paddle seemed ok, that would leave me behind every other car on as soon as signal went green. The engine seemed to be choking, rev up would not convert into transmission it looked like transmission ptoblem. I checked following things.

    Air filter changed monthly
    Spark plugs changed 4 months ago
    Throttle body cleaned 4 months ago
    O2 sensors both cleaned 1 month ago
    Exhaust system removed today
    Oil sensor cleaned 1 month ago
    Fuel pump removed (i was about to change my fuel pump but it worked fine on the bench after removal) today
    Transmission oil checked (went through vitz owners manual it said transmission oil need not to be changed for lifetime) today

    Then we found out the real trouble...
    My car was once fitted with CNG but then the kit was removed. The sensor that deals with CNG is inside throttle body on left side of air filter it had gone bad and gave poor acceleration as well as poor mileage. Replaced the sensor and the car started running like a horse. Cost me only Rs 2500. You can also try step by step diagnostics as i did but i have to appreciate my mechanic he seemed to be a phd on efi engines, had a complete grip of the entire subject. He could have ripped me by changing everything possible but he was honest on every step. Hope you also find a good one. Plus many people say its the Catalytic that causes the issue its rubbish. We checked the engine with exhaust removed and it worked as bad as before. So exhaust system and catalytic was just fine even after 12 years running 02 sensors fine even after 12 years. Transmission oil fine after 12 years. Cars are made for running, there was only one sensor bad that too because of stupid CNG kit long time ago.

    Hope it help you resolving your car issue as every case is different with every car.

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    Quote Originally Posted by mee.neo View Post
    Vitz 2004 vvti 1000cc poor acceleration issue
    Well i faced the same problem for over a month, tried everything for diagnostics, the computer gave no hint DTC was always clean. Check engine light would come sometimes but again go off upon restart. The engine itself was dull, hitting the paddle hard gave sluggish acceleration but soft paddle seemed ok, that would leave me behind every other car on as soon as signal went green. The engine seemed to be choking, rev up would not convert into transmission it looked like transmission ptoblem. I checked following things.

    Air filter changed monthly
    Spark plugs changed 4 months ago
    Throttle body cleaned 4 months ago
    O2 sensors both cleaned 1 month ago
    Exhaust system removed today
    Oil sensor cleaned 1 month ago
    Fuel pump removed (i was about to change my fuel pump but it worked fine on the bench after removal) today
    Transmission oil checked (went through vitz owners manual it said transmission oil need not to be changed for lifetime) today

    Then we found out the real trouble...
    My car was once fitted with CNG but then the kit was removed. The sensor that deals with CNG is inside throttle body on left side of air filter it had gone bad and gave poor acceleration as well as poor mileage. Replaced the sensor and the car started running like a horse. Cost me only Rs 2500. You can also try step by step diagnostics as i did but i have to appreciate my mechanic he seemed to be a phd on efi engines, had a complete grip of the entire subject. He could have ripped me by changing everything possible but he was honest on every step. Hope you also find a good one. Plus many people say its the Catalytic that causes the issue its rubbish. We checked the engine with exhaust removed and it worked as bad as before. So exhaust system and catalytic was just fine even after 12 years running 02 sensors fine even after 12 years. Transmission oil fine after 12 years. Cars are made for running, there was only one sensor bad that too because of stupid CNG kit long time ago.

    Hope it help you resolving your car issue as every case is different with every car.
    So after swapping tps sensor did you mechanic calibrat it? Secondly who ever said transmission oil is lifetime is a big idiot

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    Btw tps cant be op's car problem his car lacks tps and uses dbw tb

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