Engine Performance problem
1999 GMC Sonoma 4 cyl Two Wheel Drive Automatic 94,000 miles
I have been getting very bad mileage lately about 16 mpg. I just replaced the fuel pressure regulator because it went bad cut out the catalytic converter but kept the o2 sensor section and put on straight pipe. All new wires and plugs and tire pressure is good, I change oil regularly. All new o-rings on the fuel injectors and new intake gasket. There is a trouble code P0420 but even though, it is a 2.2L and should be getting much more. Please help!
have the same problem?
Tuesday, July 14th, 2009 AT 3:50 PM