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Lexus is200 not revving

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Comments

  • #32
    mullingar
    Registered Users, Registered Users 2 Posts: 5,338 ✭✭✭mullingar


    That is really an odd fault.

    The first few things I would check are:
    vacuum - make sure the vacuum lines are perfect. Some cars have a valve to open/close intake sections powered by the engine vacuum.
    Air-flow - make sure there is no obstruction in the intake or exhaust - disconnection is best (but keep in the MAF sensor)
    Fuel - get the fuel pressure line checked on both idle and WOT. Then maybe check each injector.
    Spark plugs - Are they all the same colour?

    If all those fail, it has to be electrical so the thinking cap needs to go on.....


  • #33
    Is200Sully
    Registered Users, Registered Users 2 Posts: 8 ✭Is200Sully


    mullingar wrote: »
    That is really an odd fault.

    The first few things I would check are:
    vacuum - make sure the vacuum lines are perfect. Some cars have a valve to open/close intake sections powered by the engine vacuum.
    Air-flow - make sure there is no obstruction in the intake or exhaust - disconnection is best (but keep in the MAF sensor)
    Fuel - get the fuel pressure line checked on both idle and WOT. Then maybe check each injector.
    Spark plugs - Are they all the same colour?

    If all those fail, it has to be electrical so the thinking cap needs to go on.....

    Serviced the car today changed out everything, oil, oil filter, air filter, spark plugs, fuel filter, polen filter...took car for a drive it was perfect later on do back to the start again would go to 4000 revvs and start shuttering and lose power...

    What's easiest way to check for a vacuum leak?


  • #34
    mullingar
    Registered Users, Registered Users 2 Posts: 5,338 ✭✭✭mullingar


    Simplest way is to disconnect a small rubber tube to see if it affects the idle.

    Another thing, check your full intake to see if there is an extra butterfly valve after the throttle body as some Toyota had an ACIS system which half closes the air intake to restrict the air intake to help low rev torque. If this is stuck closed you won't be able to rev thanks to air starvation.


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