persistant p0300 code HELP please

5

Asked by Jul 14, 2011 at 05:07 PM about the 2001 Chevrolet Suburban LT 1500 4WD

Question type: Maintenance & Repair

just purchased this 2001 suburban.  get up to around 70 mph and ses starts flashing.  Plugged into scanner and cylinders 1,5,6,8 have multiple missfires.  fuel pump leaking down so replaced it as well as plugs, wires.  Checked injector and they have between 11-14 U resistance.  No feeling of misfire at all..truck runs strong with NO perceptable missing at all.  Bad ECU???  checked all grounds also.
Thanks in advance for any help.  its driving me CRAZY!!!!

2 Answers

Having the same problems. 01 Suburban 129,000 miles . Replaced the pump also , same reason . No help . Back to the dealership tommorow for additional tests . Will keep you posted .

1,885

check distributer cap etc.

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