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2005 Freestyle FWD; when I start in the morning I hear a creaking crackling noise from exhaust system. Sounds like metal stressing, maybe from heat. The noise goes away after 5 or so minutes. No performance issues. Looking for some ideas on what is causing and how I can fix.
Update, Started car this morning on ramps. Isolated crackling noise to rear cat converter. This was replaced 2 years ago. Watched Eric the Car Guy video on how to test and voltage on from rear O2 sensor not moving at all, no error code. Did temp test and front of cat was 140 and rear was 155 so CAT is doing something. Any ideas? I bought CAT from Rock Auto with 5 year warranty, going to call Monday.
CONFLICTING INFO - I did the voltage test and the downstream O2 sensor reporting very low voltage, .05. The heat test is 120F going in rear cat and 140F coming out. I replaced the O2 sensor and still very low voltage. Any ideas???
UPDATE: The car has 3 CATs, one off each bank of engine and one in the rear. The 2 on the banks are fine with temp test; 400F going in about 200 going out. The rear is 120 in and 140 out. The rear makes some crackling noise intermittent.