I have a 1996 Buick Regal 3.1. It has a P0300 code. Plugs, wires, module, coils packs, fuel filter have been changed since the SES light came on. Nothing has changed. I took it to my automotive class. The fuel pressure was at 34psi while running, but the specs says it should be 41-47. My instructor told me since the FPR wasn't leaking, my pressure problem was most likely from the fuel pump. Changed the pump with no difference. I've changed all the parts myself, but this is nerve racking. It seems like something small because it runs pretty good, just has a little shutter. Compression test was fine for all cylinders. But cylinder 3 had a lot of misfires when I used the scanner in the misfire menu. The history on this car: came from a tow yard not running. Complete head and valve job was done. After all of this, it still has this problem. What now? Please help.
Friday, December 21st, 2012 AT 7:08 AM