Questions & Answers for: GMC how to check cat

in case. To check the cat, you can remove the oxygen sensor ahead of the cat and try driving it. It will be noisy, but if your power is improved, it is an indication that the exhaust system is plugged

...check engine light is not on? thats easy,,,put the cat back on,,,the car wont run right with out the cat fitted,, your lucky the car.s computer never put you in "get you home mode!" in that it would ...

...cat. converters for cheap or free. that will tell you if they are wrecked or not. i would get it checked out asap because if your cats are the problem they well break your o2 sensors for the cats. ...

...check indicating faulty Oxygen Sensor. Exactly where is the sensor located...was told 'upstream or downstream' of catalyic convertor. Accessible from under the vehicle or from inside under the opened ...

...to go fast but the van doesn't go fast. It will get up to highway speed eventually. No check engine light is on, and muffler shop can't check cats for ristrictions cause van has

...be your cat is plugged. Run the engine with cat disconnected to check. Or you could try removing the oxygen sensor before the cat, and see if engine runs better. That way, exhaust has a way to

activate my cat sensor cat sensor reads incomplete Drive around for 30-40 minutes, then re-check. I'm assuming you're using some kind of OBDII reader?

...Check engine light works because it shows when starting. Any guidance? You obviously have to replace a worn out & melted or broken cat, before you can diagnose anything If the cat is bad you got ...

...cat to fail. Check fuel pump. Turn key without starting and see if you hear pump running. If not. Hit fuel tank with hammer to see if pump will start working again. Converters goes bad from lack of ...

...is clogged 2002 GMC 4.3 l the cat on drivers side got red hot due to a misfiring of a cylinder. How do I check if the cat is now clogged or restricted feel the exhaust flow if weak when giving ...