Question about Cars & Trucks
Car is running rough and OBD2 shows code for possibly the O2 sensors besides the spark plugs and/or coil packs
The O2 sensors are in the exhaust. Your have up stream and down stream. The upstream is right behind the engine in the down pipe back by the firewall. The downstream sensor is under the car back by the catalytic converter.
Posted on Apr 21, 2013
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Posted on Jan 02, 2017
O2 sensors indicate unburned oxygen in the exhaust sysytem. Bad O2 sensors causes fuel mixture to run rich. It causes fuel consumption and your emmissions test will not pass. Check for vacuum leaks check the manifold.check for a misfiring cylinder, a burned exhaust valve that is leaking compression. replace the O2 sensor or sensors. Some cars have 2 . One for the intake another for the out take. If it reads a code for the Map sensor along with the O2. It is better ifyou replace both sensors. But I think that the problem lies in the oxygen sensor or sensors. Pleae vote my answer if this helps.
Posted on Jan 15, 2009
SOURCE: 91 LEGACY STARTED RUNNING ROUGH
The cylinders are numbered as on the spark pack you changed. You might have done better putting the seafoam in the tank as an injector cleaner. Not sure why you changed so many parts, you seem to know how to get the codes from test connector lead hookup and the blink pattern. You might also want to check the fuel rail pressure and the crank and cam angle sensors. Before replacing the injector, swap the #4 injector with the adjacent one and see it the code moves with the injector or stays put. If the code stays on #4, then check the injector wiring, if it moves clean or replace the injector.
Posted on Mar 21, 2009
The firing order is 1-6-5-4-3-2 the engine from the passenger side to the drivers side, radiator side 1-3-5 and on the fire wall side 2-4-6
The 3 coil from the radiator to the fire wall. #1 coil 1-4 #2 coil 5-2 and coil #3 3-6 Good luck and keep me posted, be glad to help. Its harder to explain then show, hope i made sense.
Posted on Jul 01, 2009
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