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Thread: 1nz-fe acceleration problem

  1. #1
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    Question 1nz-fe acceleration problem

    salam.friends. i would like to share a problem .the engine is 1nz-fe , the problem is i used liqui moly full system cleaner some time ago. i poured it in tank , car also runs in cng. after a month or so its giving problem in acceleration, the engine starts well but after it starts to vibrate and doesnt accelerate but pressing the pedal at full the engine takes some time and accelerate suddenly and on high rpm the car is fine.but after running it for sometime on petrol it gets ok... on cng its runs fine....but after a wash at service station it does the same in petrol and cng as well..and its plugs are iridium, seems like need to change them as well... havent changed the plugs ,its being 3 years now....

    question is ....1. is it because of the plugs ??
    2. fuel pump?
    3. injectors ? as i use the car in cng so the use of liqui moly full system treatment, dirt might clogged some area.
    4. petrol pump should i change it. i use PSO?

    is there any way to check the fuel pump????
    suggestion are welcomed as i dont want the hands of these mechanic ruining everything...i would rather try to fix it myself if i can thanks...

    实事求是

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    any suggestion.?
    实事求是

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    which car

    did you checked O2 sensor?

    1nzfe acceleration problem -13407241nzfe acceleration problem -1340725
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    Don't wash your engine compartment with high pressure water.
    Iridium spark plugs usually last 100k kms but clean and re-gap them to be on the safe side!

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    bhai is the CEL on? how much fuel is there usualy in the tank.

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    When you put an additive in the car which has to clean the injectors or is a treatment for the fuel system, make sure you fire her up properly to get it to clean... ( Drive on high RPMs)...

    What you are experiencing is maybe, clogged injectors, vacuum leak or your throttle body is dirty.... If the car is misfiring then maybe your spark plugs are shot( one of them maybe)...

    You can check that yourself if you have the right tools... If all else fails, have a diagnostics test for any DTCs...

    Cheers..
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    if this is not because of bad spark plugs or dirty throttle body then most likely its dirty injectors.

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    @ capsat. no i didnt checked the o2 sensor i will check it soon to know whether its ok or not........thanks for suggestion
    实事求是

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    wasay_ahmed . there is no indication in cluster panel...... and around 15 to 20 lts.
    实事求是

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    waleed 911...yes it can be clogged injectors , high chance of vacuum leak ...but i noticed the car doesnt speed up on throttle while running i tried to speed up the car on cng aswell .but the responce was not good......though we bought the car in 2010 and havent changed the spark plugs. throttle body is clean....
    实事求是

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    so can i pour again the fuel system cleaner but with this time use it in petrol till all the petrol finishes up??????
    实事求是

  12. #12
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    or liqui moly injector cleaner?
    实事求是

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    ........
    实事求是

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    Any progress i have just swaped the same engine in my car and its doing the same thing after first oil change and engine cleanup .

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    Get your air intake pipe inspected and maf sensor check there should be a air leaking behind the maf sensor

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    Check the bulb of airflow sensor and clean it with fine cloth. Clean the spark plugs n also fuel pressure of fuel pump.
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