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I'm making good progress. The Envoy is very close to being back on the road. Stay tuned for future installments. After an initial diagnosis of low oil pressure with a manual pressure gauge in my 2004 GMC Envoy (~255,000 miles), I decided to investigate the oil pickup tube. Come to find out, it was about 90% clogged! This is how I fixed it. GM 12628565 Timing Cover/Oil Pump GM 89017622 Crankshaft Oil Seal (Front) GM Air Conditioning Pressure Sensor Permatex Ultra Grey RTV How to Remove Oil Pickup Tube GM - Part 1 I Broke My Oil Pan (GM Oil Pickup Tube Removal - Part 2) Diagnosing Envoy Low Oil Pressure Part 1 Diagnosing Envoy Low Oil Pressure Part 2 Diagnosing Envoy Low Oil Pressure Part 3 Music Credit:
