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Diagnose my beasts spark plugs! With fault codes Diagnose my beasts spark plugs! With fault codes
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Old 25th December 2011, 00:38   #1
Bisan
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Diagnose my beasts spark plugs! With fault codes
Kind of weird. Basically the front four cylinders are running very lean. I started with 8 plugs and 1 MAF meter.


Car was throwing...

Bank B (passenger side) MAF meter
Misfire under 1500 RPMs
Multiple misfire without cutoff
Multiple misfire with cutoff
Misfires 1,2,3,4,5,7 with and without cutoff

Also found a torn ignition coil ground that I fixed as well. Let me know what you guys think.

I suspected bad coil packs here are packs 4,3,2,1 shown below.


Last edited by Bisan; 25th December 2011 at 00:42.
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Old 25th December 2011, 01:37   #2
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Can you post the numbers of the codes you had? I can't lookup descriptions. Front being lean and back being rich makes me think low fuel pressure, but I would expect different codes, so have you had other codes other than you mention? Have you any history on the fuel supply system? IE pump filter and pressure reg.
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Old 25th December 2011, 01:49   #3
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2002 BMW M5

Here are screenshots of codes.
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Old 25th December 2011, 01:55   #4
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Try unplugging the MAFs and driving it. Should run way better, if it does not put a fuel gauge on at the fuel filter and see what the readings are. Likely two new mafs are in your future. Still don't see a reason for 4 being so rich maybe a bad or dirty flow pattern.
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Old 25th December 2011, 02:04   #5
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I tried that earlier today after I put 8 new plugs in it. But no it didn't clean up at all. My new MAF won't be here until Tuesday. I was thinking a fuel issue as well.

Any other ideas?
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Old 25th December 2011, 02:17   #6
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Quote:
Originally Posted by Bisan View Post
I tried that earlier today after I put 8 new plugs in it. But no it didn't clean up at all. My new MAF won't be here until Tuesday. I was thinking a fuel issue as well.

Any other ideas?

I think you only unplugged the Bank 1 MAF. There is no code 39 for Bank 2 MAF power interrupt as it were.

Did you car suddenly start playing up, and you checked codes and you received all these misfire codes ?

What recent works have been carried out to the car in the last few months ?
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Old 25th December 2011, 02:23   #7
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No, there was nothing unplugged when we pulled the codes the other day. Today I unplugged both MAFs to see if it would clean up.

It wasn't all of a sudden, happened over 1500 miles and 6 months
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Old 25th December 2011, 02:25   #8
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Quote:
Originally Posted by Bisan View Post
No, there was nothing unplugged when we pulled the codes the other day. Today I unplugged both MAFs to see if it would clean up.

It wasn't all of a sudden, happened over 1500 miles and 6 months

But GT1 is telling you that bank 2 was NOT unplugged.

Please swap MAFS bank to bank and re read codes.
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Old 25th December 2011, 02:46   #9
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Those plugs indicate the front two cylinders on both banks are OK (grey/white ground electrodes and clean white insulator) and the back two are sooty with burnt oil, especially #4. Any oil in the plug wells? Or in the plenum?
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Old 25th December 2011, 03:53   #10
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I don't have a GT1 at my house. So I won't be able to do that until next week. I do have a scanner for my iphone.

It did pull a Lexus VVT performance sensor code (Bank 2) which I believe is a Crank Position Sensor. It is a generic code reader so codes are interchangeable on it. A CPS can cause multiple misfires and rough idles.

Spark Plugs
Mass Air Flow Meter
and.... should I consider doing the Crank Position Sensor?
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