Question about 2002 Chevrolet Impala
Posted by Anonymous on
Clean you IAC sensor, clean the throttle body and plate inside and out ket air dry for half hour, check all vacuum lines for cracks and hole especially the one that goes to the map sensor.'
replace the air filter or clean it with shop air..and then while your near the MAF sensor, take some electrical cleaner and spray clean the metal read on the maf sensor. change out all spark plugs and if wires need to be changed change them, next find the location of your oxygen sensors, my 97 has three, one on each exhaust manifold and one at the rear of the cat. if you purchase the oxygen removal tool it will make the job of removing and changing them easier or just wipe them clean, dont soak or spray clean them, they are expensive. Then go to Autozone and have them check your car for codes, tell them that it failed smog and you need to know what sensors have failed..they would probably do it for free...you dont want to guess with oxygen sensors..if they say there are faults right them down! (and have them reset them), and drive a couple miles and see if they can do it again for you or go to another Autozone and see if all the cleaning you did had any effect..if he says the faults didnt come back, then hurry over and get the car smogged..if it fails then its definately a bad CAT. The last one i had put in cost me $260 including labor. good luck can you rate this!
Posted on May 10, 2010
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Posted on Jan 02, 2017
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hi,my friend, you can try,
Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
Inspect the downstream heated oxygen sensor (HO2), replace if necessary
Replace the catalytic converter
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