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over reving


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#1 emz

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Posted 14 August 2008 - 09:14 AM

when i start my car it revs right up and it doesn't really come back down. when i reverse it revs badly and when i change gewr especially into 2nd and 3rd it over revs. does anyone have any ideas?

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#2 mintalkin

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  • Ford Model: mondeo tdci 130
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Posted 14 August 2008 - 10:58 AM

first check that all the vacume pipes from throttle body to cylinder head are ok with no leaks as this would upset the maf and produce a rich mix then it could be a throttle position sensor problem or its voltage /idle controlle valve requires cleaning you dont say how high the car revs,on 1999-2000 2L zetec e engines there is a known fault with the idle air valve which also causes over revving


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