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Old 09-28-2010, 07:22   #1 (permalink)
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Guage cluster, oil pressure.

I have a 93 bird lx 3.8 naturly asperated. Anyhow my oil pressure gauge reading low normal. Is my sending fubared or is there somthing to worry about. Car runs normally. Has a rough idle, but has since I got her. Also missing egr which im in middle of compiling list of parts needed to complete egr system. The delete was not done correctly by last owner. Car has only 56757 miles on her clock. All is stock. Except new parts iv replaced. Anyhow whats the deal with oil pressure gauge. I now the stock gauges arent that accuret. Where is the sending unit on my bird. Help please.
Thanks in advance.
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Old 10-01-2010, 21:06   #2 (permalink)
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cool Re: Guage cluster, oil pressure.

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Originally Posted by birdmedic View Post
I have a 93 bird lx 3.8 naturly asperated. Anyhow my oil pressure gauge reading low normal. Is my sending fubared or is there somthing to worry about. Car runs normally. Has a rough idle, but has since I got her. Also missing egr which im in middle of compiling list of parts needed to complete egr system. The delete was not done correctly by last owner. Car has only 56757 miles on her clock. All is stock. Except new parts iv replaced. Anyhow whats the deal with oil pressure gauge. I now the stock gauges arent that accuret. Where is the sending unit on my bird. Help please.
Thanks in advance.
Oil pressure sender is just above the oil filter, a single wire goes to it.
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Old 10-01-2010, 23:20   #3 (permalink)
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Re: Gauge cluster, oil pressure.

Hi, for the last couple decades the oil pressure gauge is just an analog idiot light. Meaning that Ford no longer uses a rheostat type sender. They use basically an off and on switch. If I remember correctly , you have to have less that 8 pounds of oil pressure to read zero on the gauge and anything above that reads normal.
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Old 10-02-2010, 08:59   #4 (permalink)
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Re: Guage cluster, oil pressure.

That's correct, the sender just closes above 8 PSI.
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Old 10-03-2010, 08:38   #5 (permalink)
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Re: Guage cluster, oil pressure.

Ok this helps. The gauge reads below the n on the word normal. Every other bird ive been in the gauge reads alot higher. In thd middle of thd word normal.
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Old 10-03-2010, 09:38   #6 (permalink)
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Re: Guage cluster, oil pressure.

There's a resistor in the circuit that let's the gauge go to that point. Unhook the wire at the sensor and the gauge should go down. Ground that wire and the gauge will go up.
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Old 10-03-2010, 09:41   #7 (permalink)
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Re: Guage cluster, oil pressure.

I should mention that there's a resistor in the cluster that will only let the gauge go about to the middle when you ground the wire.
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Old 10-04-2010, 00:19   #8 (permalink)
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Re: Gauge cluster, oil pressure.

Hi, way back when, maybe before you were born, we used to have to replace the CVR quite often for this type of gauge problems. CVR was short for Cluster Voltage Regulator If the fuel, oil pressure, and temp gauges read high or low, [all of them] It was the CVR. If it was only one gauge, it could be the gauge itself, but most likely a sender problem. Volt or Amp gauges were not controlled by the CVR.

The newer cars have changed the name of this to IVR [Instrument Voltage Regulator] and I think it is called a module now?
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Old 10-04-2010, 07:07   #9 (permalink)
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Re: Guage cluster, oil pressure.

Thank yoi for all the info. On the 3.8 the oil pressure sender is by the alternater. The chiltons book shows it there. I cant find it
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Old 10-04-2010, 10:13   #10 (permalink)
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Re: Guage cluster, oil pressure.

The sender is under the power steering pump and on top of the compressor. You have
to remove the power steering pump.
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