Question about 1999 Oldsmobile Alero

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Hi,i have a toyota tarago 2005 vvti,when i acelerate on takeoff it has a flat spot,plugs and air filter are good.any ideas?thx

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  • petergrigori Apr 07, 2011

    hi,the intake manifold and fuel injectors are difficult to get to ,if i spray carbi cleaner in the area you think will detect any leaks or you know some better trick.air filter has been done.thx

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Let me get back to you

Posted on Apr 06, 2011

Testimonial: "very helpfully pinpointed the problem,highly recommended."

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  • Jonah Oneal Apr 06, 2011

    stumble on acceleration could be stopped up fuel filter,clogged fuel injectors,intake manifold leak or plenum leak or leak at air duct to throttle body

  • petergrigori Apr 06, 2011

    hi,whats plenum?
    throttle body has been checked no leaks.
    ecu reading was done no codes or engine light comes up.
    to explain better,it runs flat around 10000rpm when you acelerate sudenly then as you acelerate it goes okay,theres like half second delay as you acelerate,and you can hear like air hissing but cant find any vacuum leaks.feels like its running lean.
    ive aded 98 octane premium fuel and fuel system cleaner it has improved about 30%but still has the problem.basically wont take off smoothly.what you think?.thx peter

  • Jonah Oneal Apr 06, 2011

    if you hear hiss noise you have a intake leak.check around air duct to air filter housing.replace air filter and fuel filter.the plenum is a aluminum cover on top of intake covering fuel injectors.

  • petergrigori Apr 07, 2011

    hi,air filter has been done.intake manifold and injectorsare hard to get to,if i spray carbi cleaner on them you think i can tell any leaks or you know some other trick?thx

  • Jonah Oneal Apr 07, 2011

    you can use a long small vacuum hose stick one end in you ear other end around intake plenum and intake air duct to air filter housing,if you have vacuum leak you will hear hissing noise thats a vacuum leak. some mechanic use carb cleaner and wd 40 but they are very flammable. thats why i use a vacuum hose to listen around intake area for vacuum leak.becareful and caution not to get hands, hose sleeves and hair caught in the engine drive belt and fan.

  • petergrigori Apr 09, 2011

    changed fuel filter sounds good now.thx for your help

  • petergrigori May 17, 2011

    toyota tarago 2002 vvti,when i switch off the engine and i restart the engine,(without taking out the key) if it starts and i let go of the accelerator the revs just drop and conks out.or it kicks over but wont start.i have found that when i remove the key and wait couple seconds then its starts and runs normal.so basically if i shut of engine i have to pull out key and reinsert to start up.can you help?.

  • Jonah Oneal May 18, 2011

    change fuel filter and clean fuel injectors.sound like engine not getting enough fuel on start up.thats why it shuts off and you can restart it.

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