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Topic: Oil Pressure Gauge - pegged to the right/inoperative

in Forum: C3 Electrical

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Oil Pressure Gauge - pegged to the right/inoperative (1/5)
11/28/12 5:31pm

airmed_pilot1
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Joined: 11/17/2012
Posts: 24

Need help troubleshooting faulty oil pressure gauge.

Symptom: Gauge "parked" at the 3:00 o'clock position whether engine is running or off.

When starting engine, the gauge momentarily moves/bounces perhaps +/- 5 degrees from the 3:00 o'clock position, then parks itself back in the 3:00 o'clock position, where it remains motionless.

Actual engine oil pressure is tests good/strong.

Connection to sensor appears fine.

Replaced Oil Pressure Sending Unit approximately one year ago

Any ideas or suggestions? Is this what a bad oil pressure gauge looks like?

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Re: Oil Pressure Gauge - pegged to the right/inoperative (2/5)
11/28/12 11:27pm

Adams' Apple

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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
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Disconnect the sensor at the sending unit, and turn the key on. If the gauge acts the same way, then either gauge is messed up, or there is a short in the wiring between the gauge and the sender.Could also be the connection on the rear of the gauge cluster(printed circuit board).

|UPDATED|11/28/2012 8:27:49 PM (AZT)|/UPDATED|

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Joel Adams
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Re: Oil Pressure Gauge - pegged to the right/inoperative (3/5)
11/29/12 12:05pm

airmed_pilot1
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Joined: 11/17/2012
Posts: 24

Thank you, Joel. Hopefully I can find time to check it out this weekend.

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Re: Oil Pressure Gauge - pegged to the right/inoperative (4/5)
11/29/12 7:06pm

Jeffm
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Sebago Lake, ME - USA

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1978 Silver Anniversary L82 4spd (M21) Red Leather. Pace Car is in the hands of a new caretaker.

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Mine was the circuit board that Joel mentioned. As I recall I think the needle did just stay up high. The green plastic board was dried out and some of the copper strips were flaking off. New board did the trick.

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Re: Oil Pressure Gauge - pegged to the right/inoperative (5/5)
1/12/13 4:55pm

airmed_pilot1
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Joined: 11/17/2012
Posts: 24

Turned out to be the oil pressure sending unit. Swap for new unit fixed the issue.

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