I have a 86 gmc sierra 1500 4.3 3 speed manuel on the cloumn.I just rebuilt the engine and when I started it up I noticed the oil pressure dropped.wHAT COULD BE THE CAUSE OF THIS? any help would be appreciated ty
What do you mean "When I started it up the oil pressure dropped?"
Did it drop as the engine warmed up? That's normal.
Did it drop when you slowed the engine down from a fast idle to a normal idle after it warmed up? That's normal.
Did it suddenly drop a whole lot while the engine continued at the same speed? That's not normal.
Are you using a mechanical pressure gauge, or the electric idiot gauge in the dash?
MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.