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AZBMW Forums › Model Specific Discussion › 1-4 Series › Could someone with a 93-95 325i/is do me a favor?
Could someone with a 93-95 325i/is do me a favor?
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johnlemonx
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PostPosted: Tue Nov 18, 2014 11:02 pm
Post subject: Could someone with a 93-95 325i/is do me a favor?

The 93 325is I just bought just failed the emissions test by a lot. Check engine light is on, code is 1215 (MAF sensor). I tested the MAF with my DMM: 14 volts going in and ~8.7-8.9 output volts at the connector at idle which I am hoping is high. The voltage falls a bit when I open the throttle. All wires going to the DME are fine, X6454 ground is fine as well.

So can someone with a 93-95 325i/iS check their working MAF and put up the output voltage here please, I am really hoping that it is my MAF that is bad.

These are the two pins to test:

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S52limo
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PostPosted: Wed Nov 19, 2014 12:06 am
Post subject: Re: Could someone with a 93-95 325i/is do me a favor?

This should help you out.

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johnlemonx
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PostPosted: Wed Nov 19, 2014 12:24 am
Post subject: Re: Could someone with a 93-95 325i/is do me a favor?

that is for the 1992 only 6 pin MAF with DME m3.1, no?

Mine has M3.3.1 w/ a four pin MAF, do these numbers still apply?

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S52limo
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PostPosted: Wed Nov 19, 2014 12:33 am
Post subject: Re: Could someone with a 93-95 325i/is do me a favor?

Yes. This covers 3.1 through 3.3.1

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johnlemonx
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PostPosted: Wed Nov 19, 2014 12:43 am
Post subject: Re: Could someone with a 93-95 325i/is do me a favor?

ok, so which is the correct resistance value between the 2 pins in my maf?

3-4 ohms or 16.3 ohms

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S52limo
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PostPosted: Wed Nov 19, 2014 12:59 am
Post subject: Re: Could someone with a 93-95 325i/is do me a favor?

Good question. The shop manual does not elaborate any further but says this applies to the 3.3.1.

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laplana325i
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PostPosted: Wed Nov 19, 2014 3:09 am
Post subject: Re: Could someone with a 93-95 325i/is do me a favor?

can you post your emission numbers
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johnlemonx
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PostPosted: Wed Nov 19, 2014 3:30 am
Post subject: Re: Could someone with a 93-95 325i/is do me a favor?


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1989 525i 193k bronzitbeige metallic
1993 325is Brilliantrot
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laplana325i
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PostPosted: Wed Nov 19, 2014 2:38 pm
Post subject: Re: Could someone with a 93-95 325i/is do me a favor?

If the engine runs fine then those numbers indicate bad catalytic converter.
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johnlemonx
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PostPosted: Wed Nov 19, 2014 3:16 pm
Post subject: Re: Could someone with a 93-95 325i/is do me a favor?

Well the engine is running in limp mode because when I disconnect the maf there is no change in the idle, I'm going to try a different maf and see if it passes or at least see if the numbers drop a bit.

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1989 525i 193k bronzitbeige metallic
1993 325is Brilliantrot
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johnlemonx
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PostPosted: Wed Nov 19, 2014 10:36 pm
Post subject: Re: Could someone with a 93-95 325i/is do me a favor?

Good news! Pulled a used maf from Glendale Auto Parts, installed it and no more check engine light. ~0.759 volts at idle. Old maf was putting out 8v more than it should have.

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1989 525i 193k bronzitbeige metallic
1993 325is Brilliantrot
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