2000 S4 code P300b

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09-01-2009, 11:04 PM

gchase65

1st Gear

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Join Date: Sep 2009

Posts: 6

2000 S4 code P300b

check eng. light came on code 300b drilled down and scanner showed misfires on cyl 1, 4, 5 changed coil pack on those still running like S.

any ideas?

09-02-2009, 12:10 AM

bigern45

2nd Gear

Join Date: Sep 2008

Location: kentucky

Posts: 1,111

icm??? maybe?? not sure which modules control which cylinders. .. maybe fuel pressure bad??

09-02-2009, 02:36 PM

meatbiscuit

2nd Gear

Join Date: Jun 2006

Location: Denver

Posts: 671

Swap ICMs, see if the misfires follow the ICM. However, if they're both bad, this test won't work

09-02-2009, 10:50 PM

gchase65

1st Gear

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Join Date: Sep 2009

Posts: 6

Strike two

Well replaced all 6 coils and swapped ICM and no luck still runs like S. Any more ideas?

09-02-2009, 11:09 PM

bigern45

2nd Gear

Join Date: Sep 2008

Location: kentucky

Posts: 1,111

check compression and fuel pressure.. ohm test the injectors as well..

09-08-2009, 08:02 AM

gchase65

1st Gear

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Join Date: Sep 2009

Posts: 6

Fixed

Thanks for the input, both ICM mods were bad I swapped out with a friend and his worked and fixed the problem.

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