Weird Oil pressure readings
Thread Starter
6th Gear
Joined: May 2010
Posts: 6
Likes: 0
Weird Oil pressure readings (not sending unit?)
Hey guys,
I have a question regarding my Z06. Last night, I took the car out for a cruise and noticed the oil pressure was maxed. I had just changed my oil pressure sending unit a week ago so I wasn't happy about it but also wasn't worried about the engine. Then I stepped on it a bit in 2nd gear ( 3-5k rpms) and the oil pressure dropped to zero so I pulled off, and the pressure came back up. It can't be the sending unit if the pressure changes can it? I'm thinking possibly oil pump but am somewhat confused about the pegged readings while normal driving and dropped readings while accelerating...
Anyone have this issue/know the underlying problem?
Thanks
I have a question regarding my Z06. Last night, I took the car out for a cruise and noticed the oil pressure was maxed. I had just changed my oil pressure sending unit a week ago so I wasn't happy about it but also wasn't worried about the engine. Then I stepped on it a bit in 2nd gear ( 3-5k rpms) and the oil pressure dropped to zero so I pulled off, and the pressure came back up. It can't be the sending unit if the pressure changes can it? I'm thinking possibly oil pump but am somewhat confused about the pegged readings while normal driving and dropped readings while accelerating...
Anyone have this issue/know the underlying problem?
Thanks
Last edited by teamcanada; Jun 24, 2010 at 07:19 PM.
Tech Contributor
Joined: Jan 2007
Posts: 19,493
Likes: 1,178
From: Dyer, IN
Hey guys,
I have a question regarding my Z06. Last night, I took the car out for a cruise and noticed the oil pressure was maxed. I had just changed my oil pressure sending unit a week ago so I wasn't happy about it but also wasn't worried about the engine. Then I stepped on it a bit in 2nd gear ( 3-5k rpms) and the oil pressure dropped to zero so I pulled off, and the pressure came back up. It can't be the sending unit if the pressure changes can it? I'm thinking possibly oil pump but am somewhat confused about the pegged readings while normal driving and dropped readings while accelerating...
Anyone have this issue/know the underlying problem?
Thanks
I have a question regarding my Z06. Last night, I took the car out for a cruise and noticed the oil pressure was maxed. I had just changed my oil pressure sending unit a week ago so I wasn't happy about it but also wasn't worried about the engine. Then I stepped on it a bit in 2nd gear ( 3-5k rpms) and the oil pressure dropped to zero so I pulled off, and the pressure came back up. It can't be the sending unit if the pressure changes can it? I'm thinking possibly oil pump but am somewhat confused about the pegged readings while normal driving and dropped readings while accelerating...
Anyone have this issue/know the underlying problem?
Thanks
Tech Contributor
Joined: Jan 2007
Posts: 19,493
Likes: 1,178
From: Dyer, IN
Well, that complicates things a bit...... Typically, when the OPS fails, it is the sensor, and it typically pegs high. I have helped a number of guys who have had problems after doing the "cut a hole" method. Why?, because they fixed the original problem with the sensor, and damaged the wiring/connector, etc....and had the same or different problem after replacing the sensor. Not saying that this is your case, but you should be aware.
Problems that can arise:
Damaged wiring to the OPS.
Loss of connector seal, and water is allowed to collect.
A loss of a ground will cause a max oil pressure indication.
The 5 volt ref shorted to ground will cause zero indication.
Problems that can arise:
Damaged wiring to the OPS.
Loss of connector seal, and water is allowed to collect.
A loss of a ground will cause a max oil pressure indication.
The 5 volt ref shorted to ground will cause zero indication.
Last edited by lucky131969; Jun 28, 2010 at 06:25 PM.
Burning Brakes
Joined: Oct 2007
Posts: 1,093
Likes: 33
From: Morristown TN
was it raining or had you just washed it.
I have found that water on the sending unit will cause it to go crazy.
mine did the same thing when I washed the engine. Then after I replaced it I had the cowl off getting it painted body color and as soon as it rained it did the same thing.
Mine has the hole cut in it.
I have found that water on the sending unit will cause it to go crazy.
mine did the same thing when I washed the engine. Then after I replaced it I had the cowl off getting it painted body color and as soon as it rained it did the same thing.
Mine has the hole cut in it.
Thread Starter
6th Gear
Joined: May 2010
Posts: 6
Likes: 0
I will definitely double check the wiring. It was fine when I put it back in last time but maybe something came loose. Thanks
The car was bone dry so I don't think that was the issue.
I'm hoping its not the oil pump. I can't see the pressure changing that much with a blown pump.
The car was bone dry so I don't think that was the issue.
I'm hoping its not the oil pump. I can't see the pressure changing that much with a blown pump.
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