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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Sep-24-2018, 03:52:11 PM   #1
E46_RI
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Default Help diagnosing multiple misfires

Hello all,

I'm working on trying to diagnose a misfire in my 2003 M3 and I'm looking for a fresh set of eyes to bounce some ideas off.

I was heading home from work and the check engine light came on recently and the car felt like it was down on power quite a bit. I had to put it to the floor to get it to go. I drove it

about another mile and was able to get home. The codes that the car produced with a cheap OBD scanner were P0303, P0304, P0305 and P0300. After shutting the car off I was not able to get it

to run again. It would try to start, stumble and then it would just turn over without even trying to start.

I cleared all the codes and purchased a better OBD scanner (Carly) and get only one code remaining (considering the car won't run) P0048 WI1 line short-circuit to U-batt; Fuel Pump - ECU

not present/no answer; Tire pressure control - ECU not present.

Here's what I've done so far:

- Replaced all coils (Bosch)
- Replaced fuel pump
- Replaced the fuel filter
- Measured the fuel Pressure (68psi)

- Fuses 22, 29 and 30 (Engine control fuses) are all good

I've checked the Main ECU relay and I'm getting power (11.91V) to the center pin on the relay (can't recall the pin # at the moment) with the ignition on.


Any advice on which direction to go from here?
__________________

03 TOPAZ BLUE M3 VERT/BLACK LEATHER/HARDTOP/SMG/KONI ADJUSTABLE/VOGTLAND SPRINGS/OEM ZCP/OEM 18'S SQUARE/
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Discussing E46 M3 Market Sales Tracker: Please Report Your Purchase or Sale! in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)