Question about 1989 Chevrolet Suburban
I have a rebuilt engine in my 1989 Suburban. For the last 15K mile the
oil has always indicated around 50PSI at speed and 28-30PSI at idle. I
didn't catch the exact moment that it did it but it was within a day of
driving. Now the gauge indicates 30PSI at speed and sputters between
0-and 20PSI at idle. Finally settling in at 0. I know there are 3
possibilities: The pump is damaged, The relief valve is stuck or the
sending unit is bad. Is there an easy, no cost way to determine which
it might be or do the symptoms tell you which it is most likely to be.
I was going to spend the money on a new sending unit since it is an
original part, but was hoping not to waste $40 if it wasn't bad.
Thanks for your help ahead of time
If your oil pressure actually dropped below 10 psi at idle, your hydraulic lifters would start to collapse. This would cause them to "tick" or "click" at idle. If you are not getting this clicking, change the sending unit.
Posted on Dec 23, 2008
a 6ya Mechanic 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 repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Jan 26, 2012 | Cars & Trucks
Apr 20, 2011 | 2004 Chevrolet Suburban
Aug 10, 2017 | 1999 Chevrolet Suburban
Jan 19, 2011 | 2007 Chevrolet Suburban Three-Quarter-Ton...
Oil pressure should be around 30 at idle and then sit at 60 when engine is above 2,000 RPM. If pressure varies at all engine speeds it indicates a sticking pressure relief valve which is located within the oil pump. You could try using some oil flushing product in the engine oil before the next oil change to see if it removes the gunk that is causing the valve to stick. If that does not improve it you should see a mechanic about replacing the relief valve.
Sep 29, 2010 | 1993 GMC Suburban
Feb 21, 2010 | 1989 Chevrolet Suburban
Sep 27, 2009 | 1999 Chevrolet Suburban
Aug 03, 2009 | 2003 Chevrolet Suburban 1500
Nov 04, 2008 | 2002 Chevrolet Suburban
351 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: