89 Rx7 temp and oil pressure gauge problem
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89 Rx7 temp and oil pressure gauge problem
Hey guys! I recently pulled the engine out of my 89 n/a to fix a major front cover leak it had for a little while. So we dropped the engine back in yesterday, got everything hooked up and ready to go. And now my temperature gauge doesn't work and my oil pressure gauge maxes out as soon as I turn the key on to accessories. I have the correct wires going where they need to go. Any ideas? Greatly appreciate any help given. Thanks.
#2
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Are you positive the water temp sensor and oil pressure sender are connected correctly? If the pressure sender wire (Y/R if I recall correctly) is grounded against the chassis, the gauge will peg. It will also damage the gauge if you allow it to do so for very long. The circuit needs a small amount of resistance, which is normally provided by the sender.
The water temp sensor get the yellow(?) wire with a bullet connector.
The water temp sensor get the yellow(?) wire with a bullet connector.
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Yes sir. The sensors functioned properly before the engine was removed and they were left alone and not touched till I started connecting everything. Only thing I can think of is there is a break in the wire going to the temp sensor or the sensor is bad. And the sending unit may be faulty or there is oil on the plug.
#4
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http://www.rotaryheads.com/PDF/2nd_g...stem_part1.pdf
Pg. 15-30 under "Meters"
If you have a resistor in the 100-200 ohm range, you can temporarily connect it to the end of the oil pressure sender. Ground the other side to the chassis. You should see the needle on the gauge move part of the way up relative to the resistance.
30 psi - 197 ohms
60 psi - 141 ohms
110 psi - 103 ohms
For the sender, if the engine is idling, you can measure resistance of the sender. You'll have oil pressure, so there should be a value somewhere around 200 ohms.
For the water temp sensor, check page 15-32. The temp sensor itself can be tested in a pot of boiling water, but you'll need to partially drain the coolant before removal. You can also warm the engine up and measure the resistance between the sensor and a ground point.
For the gauge, you can use the resistor trick from above. The two temp/resistance values in the FSM are:
50C - 154 ohms
130C - 12 ohms
Pg. 15-30 under "Meters"
If you have a resistor in the 100-200 ohm range, you can temporarily connect it to the end of the oil pressure sender. Ground the other side to the chassis. You should see the needle on the gauge move part of the way up relative to the resistance.
30 psi - 197 ohms
60 psi - 141 ohms
110 psi - 103 ohms
For the sender, if the engine is idling, you can measure resistance of the sender. You'll have oil pressure, so there should be a value somewhere around 200 ohms.
For the water temp sensor, check page 15-32. The temp sensor itself can be tested in a pot of boiling water, but you'll need to partially drain the coolant before removal. You can also warm the engine up and measure the resistance between the sensor and a ground point.
For the gauge, you can use the resistor trick from above. The two temp/resistance values in the FSM are:
50C - 154 ohms
130C - 12 ohms
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I found and fixed the problem. I feel like I wasted your time. The wire that connects to the sending unit had a non factory plug and the previous owner clamped it down on the colored part of the wire do that the only thing making contact would be the small amount of wires coming out of the outer layer and wasn't making contact properly. The temperature sensor wire (I just figured out that wire comes from the passenger side harness) was connected to the wrong thing. On the S5 Rx7's there is a small black relay that mounts to the same hole the clutch slave bolts to and I had that plugged in to the temperature sensor wire. And visa versa. But the temp sens wire was too short so I had to lengthen it to reach the sensor.
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Lol yeah. There's more than a fare share of vacuum lines and plugs either blocked off or not a partner plug for it. But none of it affects the way the car drives. I guess it was done for the better.. But Thank you and I appreciate your help and time.
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#8
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Oil Temp Gauge, Requesting some Guidance.
My needle is pegged and the Y/R wire is grounded somewhere. My question is this, can I just replace the wire from the oil pressure sender to be wired directly to the gauge/cluster of ME-02 PIN #6.
Would this work?
I just don't want to remove the harness that includes the Y/R wire for the oil pressure sender. Any ideas or help would be great. Thanks.
Would this work?
I just don't want to remove the harness that includes the Y/R wire for the oil pressure sender. Any ideas or help would be great. Thanks.
Are you positive the water temp sensor and oil pressure sender are connected correctly? If the pressure sender wire (Y/R if I recall correctly) is grounded against the chassis, the gauge will peg. It will also damage the gauge if you allow it to do so for very long. The circuit needs a small amount of resistance, which is normally provided by the sender.
The water temp sensor get the yellow(?) wire with a bullet connector.
The water temp sensor get the yellow(?) wire with a bullet connector.
#9
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My needle is pegged and the Y/R wire is grounded somewhere. My question is this, can I just replace the wire from the oil pressure sender to be wired directly to the gauge/cluster of ME-02 PIN #6.
Would this work?
I just don't want to remove the harness that includes the Y/R wire for the oil pressure sender. Any ideas or help would be great. Thanks.
Would this work?
I just don't want to remove the harness that includes the Y/R wire for the oil pressure sender. Any ideas or help would be great. Thanks.
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