bmw 520i 91 idle problems

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neaty - 02 Nov 2006 14:06 GMT

can any help got a bmw with idle problems when warm goes up and down then
cuts out have changed the idle air valve and still doing it also had a
bloke out and he says it the alternater could this b right or not thanks
shaun

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John Burns - 02 Nov 2006 14:38 GMT

> can any help got a bmw with idle problems when warm goes up and down then
> cuts out have changed the idle air valve and still doing it also had a
> bloke out and he says it the alternater could this b right or not

More likely a vacuum leak, throttle position switch or in the event of
oscillating idle the O2 sensor.

Unlikely to be alternator.

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neaty - 02 Nov 2006 16:39 GMT

thanks 4 that any ideas where 2 start on it

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Leroy - 02 Nov 2006 19:52 GMT

Does it have an M20 engine or an M50?

> thanks 4 that any ideas where 2 start on it

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Tbird-Steve - 04 Nov 2006 03:10 GMT

Look for oil leaks coming from the engine and if you find any just trace it
back. If none, check all the air and vacuum hoses and feel around
underneath too. Also check things like the O rings on the dipstick and
anywhere else where air might be getting into the engine.

Steve

> thanks 4 that any ideas where 2 start on it

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neaty - 11 Nov 2006 01:20 GMT

hi thanks 4 that checked all the hoses and no oil leak any where any other
help

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