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Oil Pressure Gauge Jumping

bobs78

Well-known member
Joined
Jun 6, 2004
Messages
90
Location
Hot AZ
Corvette
50th AE vert - 25th SA - 54 Polo White
Got a strange problem with the oil gauge in my '78. The oil pressure gauge jumps/vibrates at idle. It only does this at idle. Once I increase rpm or drive the gauge stops vibrating and shows constant pressure readings. :confused Its the original gauge and sender to the car.

Any ideas what is making do this? Thanks for your help.
 

bobs78

Well-known member
Joined
Jun 6, 2004
Messages
90
Location
Hot AZ
Corvette
50th AE vert - 25th SA - 54 Polo White
That's really sad...at only 28 years young too :L

THANKS :beer
 

Hib Halverson

Technical Writer for Internet & Print Media
Joined
Jan 10, 2001
Messages
13,453
Location
CenCoast CA
Corvette
71 04 12 19
First, check the oil pressure with a second gauge and use a mechanical gauge to eliminate both the stock gauge and sender. If it does the same thing, then you may have a problem with the engine oiling system.

If the second gauge does not fluctuate, then check the sender with an ohm meter with the engine idling. If the resistance varies significantly but in a cyclical manner, change the sender. if the sender is ok, replace the gauge.
 

bobs78

Well-known member
Joined
Jun 6, 2004
Messages
90
Location
Hot AZ
Corvette
50th AE vert - 25th SA - 54 Polo White
Thanks Hib. :m
 

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