Engine Mechanical problem
1995 Cadillac Seville V8 Front Wheel Drive Automatic 72,000 miles
Starts, warms up and idles fine. Good gas mileage and performance. No hesitation.
After listening to different components with a wooden dowel, the only noise comes from the forward valve train but only under light loads in the lower RPM range. I get it while cruising constant speeds, with or without cruise control. The sound is reproduce-able while applying a gentle power brake. No codes. EGR valve and solenoid seem to function fine. Removed valve cover to inspect. Nothing out of place or loose.
Being a new owner, I was caught by surprise with a low oil level at about 50% oil life. It had 10-30 synthetic. I added a quart+ and that's when the noise began. Very slight at first then after about 800 miles, it's kinda loud. Changed oil to a higher viscosity 15-40. No change.
Tuesday, October 19th, 2010 AT 11:45 AM