Mechanics

GMC SONOMA TOOL PROBLEM

1991 GMC Sonoma • 139,000 miles

How do I remove and test the oil pressure sending unit on the 4.3 l auto transmission with a/c. I think the needle on the dash is just flipping back and forth rapidly like there is something wrong with the guage in the dash. Do not want to replace gauge inside dash as I have had this area apart before and it is very difficult to get all of the a/c controls hooked back up. Is there a special tool required to remove the sending unit or just a tool that I need to purchase such as an open end wrench?
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Boballencar
February 10, 2013.



There is a socket for this available at a parts store.

Use a manual gauge to verify pressure. The sender is a common failure

Roy

ASEMaster6371
Feb 10, 2013.
What is a manual guage, the sending unit is electrical

Tiny
Boballencar
Feb 10, 2013.
You can rent one from a parts store to insert where the sender goes on the motor to verify the actual pressure

Roy

ASEMaster6371
Feb 10, 2013.