My 1999 jimmy is giving a po 300 code it runs very rough. Has new cap and rotor, the plugs and wires are less than a year old. Used a cigar to blow smoke into intake to check for vacuum leak found none. Freeze frame data showed stft bank one 13.5%ltft bank one 0% stft bank 2 12.8% ltft bank 2 0% what would my next option be and how would I go about it thanks for response gary
have the same problem?
Wednesday, September 26th, 2012 AT 1:34 AM
First, do a compression test to make sure the motor is good.
The 300 is a random missfire. It could be an injector but before we go there. Do the test
Wednesday, September 26th, 2012 AT 1:44 AM
THE COMPRESSION TEST CHECKED OUT GOOD ON ALL 6 CYLINDERS