Hello, to start the story i cruise control was on and driving up maybe 27 ish degree angle hill and its a substantial hill at best, i noticed doing 65-70 mph up hill and all of a sudden i feel a kick back or hesitation and mis fire of you will. Took the car out of cruise control and had on drive and 6th gear theres vibration amd significat amounts through the whole car. Threw in semi manuel and dropped to 5th gear, got better in means of no much vibratioj but still present. Got home called dealer ship, ( still under warranty) and was advised p0303 p0300 were the codes. Warranty covered new injector and the axle seal due to leaking. I covered 1 new spark plug and 2 step fuel cleaner. Got the car back and service rep said the check engine will go away after i " put miles under it" and as soon as i hopped in the car check engine light om solid not flashing. And vibration while throttlling. Got home got code reader. P0303. Checked spark plug seemed black shiny as if too much fuel not enough spark. Plug waa fully seated due to wiggle test. Took intake off and noticed 3rd cylinder injector plug unplugged, ill try and upload picture. Tested injector wireing harness specifially from main male plug to all four injectors and to knock and to pressure regulator. First time checking it 2 inhector wires read 10.40 volts. Cylinder 1 and 2, cylinger 3 had none. Cylinder 4 had 2.45 volts. Checked femaile plug from main wiring harness found 4 2 sets of pins reading 10.40 volts and the other 2 sets of pins ready 5.06 colts. Tested while main wireing harness plugged in. Tested again amd noticed cylinders 1, 2, 3 reading 10.40 volts cylinder 4 2.4 volts. Checked knock sensor plug and pressure regulator and both ready 5.06 volts. Ordered injector wiring harness with fuel rail and all different injectors. Also side note i replugged cylinder 3 injector in that was the only brand new one the dealership put in and noticed there was a missing plastic restrictor piece on the very top, very suspect and likely causing the miss fire. So put back to gether with new used parts off ebay, i know ebay but they sold everything as is tested and i even got warranty for the whole thing. Put fuel rail injectors back in and fired up. Still p0303. Checked plugs again noticed silky black on cylinder 3 and faded or worn look on cylinder 2 swapped to see if problem followed, it didnt. Swapped coils to see if problem follows. It didnt. Visually checked coils and no apparant issues found. Now what i found that was interesting is theres not spark plug wires per say, i say that because its the main wiring harness from the ecm silver box 2 big plugs, the wires that plug into that follow all the way with no breaks to the coil packs. I checked power and ground, on the plug theres three wires. 1 farthest left and ome dorecting next to it. No 3rd wires and a fourth to the far right. The left and right pin well call 1 and 4 pins were ready battery volts. 12.86 volts. Pins 1 and 2 reading i believe 2.45 volts. Pons 2 and 4 reading 9 volts if my memory serves me correct. Ive checked the number 1 pin and to ground and got .2 ohms of resitance from the pin to a ground point and then the number 4 pin to positive and got battery volts 12.86 volts. And so ive spent time reading it could be bad ground, the ecm could be having a bad time with the third cylinder meaning ive read it sometumes craps out and throws a code due to the ecm being bad. Ive read the tps and or 02 se sors both could be at fault or the crank/cam sensor could be at fault. Just kinda wondering is all, called the warranty and said fix it or take it. Just got it this year with 70,020 miles and its not at 92202. Warranty said let the same dealership spend another hours diagnosis and if problem doesnt go away they will possibly take it and no money will need to be paid on the loan. Any ideas.
the first picture is what the plug shouldnt look like, unplugged the second to add clarity and to remove doubt that im crazy lol the i believe second cylinder plug is plugged in.
