Question about 2000 Isuzu Rodeo

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Full trottle when i start my 4cyl rodeo it,s a 4cyl manual tran

As soon as you start it up it goes to full trottle and you have to turn the key off to stop it from over reving

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  • jroy17 Nov 16, 2008

    Everything under the hood seems to be working fine .The cable seems ok as well..The throttle linkage seems to ok as well

  • jroy17 Nov 16, 2008

    No i did not check the air bypass/ idle cont. valve....That a good possibillity because the cables and the throttle was closed manually.........Just one thing where is the air bypass/idle cont valve.


    Thanks again for your help John

  • jroy17 Nov 16, 2008

    So if it has a problem it would cause the engine to go to full throttle when starting ??

    thanks again john


  • jroy17 Nov 18, 2008

    ok when i push the gas pedal to the floor it will not start.But when i start it without touching the gas pedal it goes to full rpms and i have to shut it off..How do i check the air bypass/idle cont valve ? Is it on the side of the carb or is it in the rear of the carb.

    Thanks for your help everyone John


  • jroy17 Nov 19, 2008

    i found the problem it was and is a cracked or broken intake.Air is sucking in.Two of the flanges are broken...Thanks everybody


    John


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Possibly the return spring on carburetor arm has broken or come off and letting the revs too maximum when turning key with motor off get someone to push accelerator while you investigate whats happening at carburetor end at worst it could also be a broken accelerator cable hope this is helpful glenn.........

Posted on Nov 16, 2008

  • glenn brown Nov 16, 2008

    ok my next thought is after this is the control flap or some component within the carburetor is failing to return from full throttle pull the air cleaner of and have a squizz inside carby push accelerator look yo see if any thing corrupted this is a good one i will be waiting to hear from ya glenn..........

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  • 393 Answers

Check throttle linkage i think you'll find it stuck wide open.

Posted on Nov 16, 2008

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  • darin brown Nov 16, 2008

    did you manually move throttle to closed position. also check air bypass/idle air cont valves

  • darin brown Nov 16, 2008

    mounted near the housing near throttle plates/it bleeds air around plate for cold start/(like a choke).

  • darin brown Nov 16, 2008

    lissen for a hiising sound/vaccum leak will raise rpm on fuel injected vehicles

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Wizard isuzu


Check your Fuel Lines and your Fuel Pump. (I just fixed a problem with my 2001 Isuzu Rodeo Fuel Return Line).

Also remember that in Rodeos, as soon as you turn your car key to turn the ignition on (just to make the dashboard lights go on) a certain amount of gasoline gets pumped to your engine in preparation of you turning the key all the way to crank the ignition and start the car. In other words, even before you turn the key all the way to crank the ignition, the Fuel Pump will pump some gasoline through the Fuel Lines to your engine (it will pump the gasoline for about 4 seconds then stop). So when you go to start your Rodeo, remember to turn the key with one continuos motion so that you start the ignition cranking while the gasoline is being actively pumped.

In addition, you should never turn the ignition lights on without turning the key all the way to start the engine. Doing so could cause that bit of gasoline that was pumped to start the engine to just sit there and create problems.

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