Question about 1999 GMC Suburban
When the motor is cold oil pressure is at 40psi once it gets to 110 degrees the pressure will botom out if you don't stay on gas and keep rpms at approx 1500 or higher has bad knocking sound when pressure drops
Sorry to say it sounds like the motor is gone. Higher oil pressure when the oil is cold is normal. But, when the engine gets to operating temp and the pressure bottoms out and the engine knocks you have big problems. If the mileage is very high (150,000) or more your bearings are so worn that the oil can't fill the void between the surfaces and thus the low oil pressure.
Posted on Feb 07, 2009
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Mar 06, 2017 | 1990 Ford F350
May 17, 2016 | Cars & Trucks
Dec 23, 2015 | 2003 Chevrolet Silverado 1500
Mar 03, 2015 | GMC Cars & Trucks
Jan 16, 2013 | 2004 Ford Super Duty F 550
Jun 26, 2011 | Chevrolet C3500 Cars & Trucks
Jan 20, 2010 | 1983 Toyota Pickup
Sep 19, 2009 | 1998 Jeep Wrangler
Jul 16, 2009 | 2002 Isuzu Rodeo
785 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: