A crushed exhaust channel can margin to catalytic converter problems with the GMC Sierra.
A catalytic converter decreases the toxicity of released emissions from an engine. A GMC Sierra catalytic converter can evolve problems that can accumulation emissions, nevertheless these can usually be resolved via some basic troubleshooting techniques.
Rattling Noise
Provided your GMC Sierra suffers from loss of engine competence, the catalytic converter may be restricted. Remove the bolts on the catalytic converter flange and detach the converter. Position a bright at one edge of the catalytic converter and double o wound up the other cusp. Whether you scrutinize partially obstructed or no glossy, the catalytic converter is clogged and requires replacement.
A rattling buzz emanating from your GMC Sierra catalytic converter can conclusion from loose heat shields, caused by rust buildup environing the welding. Proof the heat shields for looseness, and re-weld them or install a clamp to secure to the catalytic converter.
Loss of Power
Exhaust Backpressure
Exhaust back impulse, or emissions from the exhaust backing up into the engine, results in empty-handed fuel economy or engine stalling. Trial the intake manifold vacuum with a vacuum gauge while the engine idles; provided you read less than 18 inches of vacuum, back pressure is building in the exhaust system. Inspect the converter for a crushed or otherwise damaged exhaust pipe, and replace it as needed, or replace the catalytic converter if it is restricted.
