Ive been getting a p0300,p0304 & p0307 code.

Question

Ive been getting a p0300,p0303,p0307 and a p0172 system to rich code! Ive changed all the sensors and checked for vaccum leaks!!!!! What else can i do or what could it be? I have a live data scanner but not to sure on what all the numbers mean! Any info would be great.

                                             Thanks Brian

Answer 1

P0300 Random misfire

P0303 Misfire #3 cylinder

P0307 Misfire # 7 cylinder

P0172 Fuel trim too rich bank 1

If your going to use the live data the fuel trim on bank 2 you should see short fuel trim bank 2 and long fuel trim bank 2 both these number should equal less than 10 or close to 0. IE  +2  +  -7 = 5,,Think  of this as money positive is what someone gives you and a negative is what some takes from you,Each bank should be less than 10, Other than that you need to do a compression test on number 3 and number 7 if the compression is good are you willing to swap out the injector and see if the misfire moves?

 

Answer 2

Compression should be good since I rebuilt the motor about a year ago!!! Should I look at injecters?