I have a 2003 trailblazer with the I-6 engine. Three weeks ago I noticed the oil pressure drop and the idle slow down when i stopped. Pressure stays up and engine runs ok at town and highway speeds. Changed oil and filter, didn't help. Any ideas before I change the oil pump?

 

Welcome to the forum. Specification says the oil pressure should be 12 psi @ 1200 RPM. Oil pressure will go down with the engine speed. You may not have a problem other than the idle speed anomaly.

 

Idle speed drops to about 500 to 600 rpm after warmup. Dirty injectors or some other issue? Thanks for replying!!

 

The idle speed is not manually adjustable. It may go lower than normal if you happend to have the A/C on (will run automatically with defog or recirc setting) or something with a heavy electrical load. If it bothers you, consider getting it serviced.