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| damien89 | Another problem, is their a way to check the oil pressure switch/sensor? | ||
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Guru
 
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Lately the instrument cluster always displayd 72-75psi oil pressure no matter what rpm.
Now i know that this is impossible, after consulting the fsm it tells me to either use a fused jumper, connect it between tan and ground and the cluster should display 0 psi or to use a j33431 instr panel tester and see what results you get with variable ohms. Now as i do not have these two things to make the tests is their a way to check the sensor itself? The sensor is the 3 wire type on the 89 vette. Here's the funny thing, on the 89 fsm on page 8A-82-1 the diagram shows the sensor with just one wire coming out instead of three?? How come? |
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Posted on: 2011/8/7 15:22
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| BillH | Re: Another problem, is their a way to check the oil pressure switch/sensor? | ||
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The Stig Moderator
 
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I don't have that FSM but an inline jumper is easy to make, it's just an inline fuse holder with like a half amp fuse.
You can get one at the parts stores or Radio Shack for $3.00 and you will need a fuse. Attach file:  fuse.jpg (0.00 KB) |
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Posted on: 2011/8/7 15:50
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| toptechx6 | Re: Another problem, is their a way to check the oil pressure switch/sensor? | ||
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Senior Guru
 
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If your 89 is the same as my 93 I understand your confusion. There are two oil pressure sending units, one has 3 wires, on my 93 the green wire is hot at all times, the red wire provides back up power to the fuel pump after oil pressure reaches approx 5 psi, the tan wire is the variable ground for the gauge.
The sender with a single wire (lt. blue on my 93) is just a switch that illuminates the check gauges lamp if oil pressure is low. The wiring diagram in my FSM does not show the 3 wire sender correctly, rather it shows the different functions in two sections of the wiring diagrams, the diagram for the fuel injection shows the green and red wire only, the diagram one for the instrument cluster shows the single tan wire. I would check your oil pressure with a mechanical gauge, if the mechanical gauge reads correctly I would replace the three wire sending unit. |
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Posted on: 2011/8/7 18:16
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| damien89 | Re: Another problem, is their a way to check the oil pressure switch/sensor? | ||
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Guru
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Quote:
To tell you the truth i have seen a small photo which shows a oil sender with one wire coming out from the side of the block at the drivers side, But now my confusion is that the diagram i mentioned in the other post shows a single wire sensor going to the cluster. So the other 3 wire sensor that is near the distributor which has 3 wires and there is another wire connected to the tach on the dist. is not mentioned in the fsm or maybe i didn't manage to find it. So now the question is, which is the oil sensor which feeds the cluster? |
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Posted on: 2011/8/7 20:08
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| toptechx6 | Re: Another problem, is their a way to check the oil pressure switch/sensor? | ||
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Senior Guru
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Check the wire colors going to the three wire sender near the distributor, if you find a tan one try grounding it with the simple fused jumper described by Bill H with the ignition key on. If you ground the correct wire to the gauge it should read at the low end of the scale.
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Posted on: 2011/8/7 20:26
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| damien89 | Re: Another problem, is their a way to check the oil pressure switch/sensor? | ||
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Thanks, will try that when i get a fused jumper.
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Posted on: 2011/8/7 20:33
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| vetteoz | Re: Another problem, is their a way to check the oil pressure switch/sensor? | ||
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Senior Guru
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Quote:
Oil temp sensor [IMG]http://i171.photobucket.com/albums/u309/vetteoz/electrical/Oiltemp.jpg[/IMG] |
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Posted on: 2011/8/7 23:52
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| vetteoz | Re: Another problem, is their a way to check the oil pressure switch/sensor? | ||
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Quote:
White wire on dist cap is tacho signal direct to instrument cluster ( through the tach filter not shown in FSM ) [IMG]http://i171.photobucket.com/albums/u309/vetteoz/electrical/IGN.jpg[/IMG] |
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Posted on: 2011/8/7 23:58
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| Matatk | Re: Another problem, is their a way to check the oil pressure switch/sensor? | ||
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Webmaster
 
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Quote:
Page 8A-82-1 is the instrument cluster section. That's why it only shows one wire, because the tan wire is the one that feeds the cluster. The sensor itself has 3 wires. More than likely the sensor is bad. If you remove the dizzy it's much easier to pull/replace. Matthew |
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Posted on: 2011/8/9 0:56
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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