hi my old gmc is running a little rough latly, she is misfiring & wants to quit I can also smell strong gas fumes out the tail pipe.
I have engine codes
P0102 - MAF sensor circuit low input
P0113 - Intake Air Temperature cicuit high input
P0143 - 02 Sensor circuit low volatage (bank 1, sensor 3)
P0146 - 02 Sensor circuit no activity
P0171 - System too lean bank 1 (assumed vaccum leak)
P0300 - random multiple cylinder misfire
any help would be greatly appreciated on what could be wrong.
WHAT I HAVE TRIED:
1. Putting a new coil, & coil wire on - no difference
2. checking to make sure the air intake vent/tube wasn't lifted off the top of the motor (last time it cause a misfire)
3. checked alternator & battery (battery has 12.6 volts, alternator has 14.2 volts)
4. new distributor cap
thank you !
I have engine codes
P0102 - MAF sensor circuit low input
P0113 - Intake Air Temperature cicuit high input
P0143 - 02 Sensor circuit low volatage (bank 1, sensor 3)
P0146 - 02 Sensor circuit no activity
P0171 - System too lean bank 1 (assumed vaccum leak)
P0300 - random multiple cylinder misfire
any help would be greatly appreciated on what could be wrong.
WHAT I HAVE TRIED:
1. Putting a new coil, & coil wire on - no difference
2. checking to make sure the air intake vent/tube wasn't lifted off the top of the motor (last time it cause a misfire)
3. checked alternator & battery (battery has 12.6 volts, alternator has 14.2 volts)
4. new distributor cap
thank you !