2009 MS3 CEL P0303

C

ChadG

Greenie N00B Member
Year/Make/Model: 2009 mazda mazdaspeed3
Mileage: 123800
Location: Norco, CA
Concern: Car is running fine but throwing a CEL for a cylinder 3 misfire
DTC's: P0303
Modifications: none
ECU/Tuning Software: none
Tuner: none
Is the concern intermittent? No
Can you duplicate the concern? Yes (CEL is consistently turning on, but car doesn't experience any drive ability concerns)
Recent Repairs:
checked gap on spark plugs (all are fine)
Swapped plugs onto a dif cylinder
Swapped coils onto dif cylinder (code stays on 3rd)
Put on new vacuum runner solenoid valve
Checked for leaks with soapy water
Note: new fuel injectors were put on approx 6 months ago
Correction: Please help!!!
 
check the wiring to the coil pack and in particular make sure none of the pins are pushing out of the connectors
 
Raider said:
0.026-0.028 gap, non Amazon sourced NGK plugs. Compression and leak down test time. Then look at the injector and also valve cleaning if not performed.
Click to expand...
The current plugs are newer and gapped correctly and are not amazon sourced. I also swapped plugs to different cylinders and the problem stayed on cylinder 3. Did a compression test and the compression is within normal ranges on all cylinders. Check fuel pressure as well and they are all consistent and within normal ranges and they are new injectors. Still drawing a blank here

Easter Bunny said:
check the wiring to the coil pack and in particular make sure none of the pins are pushing out of the connectors
Click to expand...
Check the coils and nothing seems to be wrong. Also swapped the coil onto a different cylinder and the code stayed on #3. Just not sure what else to do
 
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