Idle Problems E34 525i M50 1995

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ckramer7070@gmail.com - 07 Oct 2006 22:45 GMT

Recently I have been having problems when stopping for a peroid of 30s
to 1min, the engine revs high for a moment then the check engine light
comes on. It may stay on for 5min-10min then turns off, during this
time the engine runs rough at idle or at speed. Checking the engine
code only turns up 1222 (Lambda Control) which has been in the ECU for
the last 1-1/2 yrs, I suspect the MAF is going bad but the check engine
light always shuts off before I can check the code when this issue
presents itself. Any suggestions?

Thank you,

Chad

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Fred W - 08 Oct 2006 11:58 GMT

> Recently I have been having problems when stopping for a peroid of 30s
> to 1min, the engine revs high for a moment then the check engine light
[quoted text clipped - 8 lines]
>
> Chad

Chad,

Are you sure that you are extracting all of the codes? When you do the
stomp test to get the check engine codes you need to re-do the 5 stomps
after each code to get to the next one, other wise the light will
continue to flash out the same (first) code. When you have seen all of
the codes you will get a 1000 to indicate no more codes.

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-Fred W

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ckramer7070@gmail.com - 09 Oct 2006 14:35 GMT

Thank you Fred, I had no idea that I needed to do the stomp test more
than once. I'll give it a try tonight.

Thanks,

Chad

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ckramer7070@gmail.com - 09 Oct 2006 22:18 GMT

Looks like code 1221 came up as well, O2 sensor. I have replaced the O2
sensor last year and possibly not cleared this code, or it is the
other O2 sensor. Can someone tell me where these are located? The one
that was replaced last year was about mid frame.

Thanks,

Chad

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John Burns - 08 Oct 2006 12:22 GMT

> Recently I have been having problems when stopping for a peroid of 30s
> to 1min, the engine revs high for a moment then the check engine light
[quoted text clipped - 4 lines]
> light always shuts off before I can check the code when this issue
> presents itself. Any suggestions?

Sounds like a sticking idle control valve.

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