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Old 07-20-2014, 11:36 PM
Topp dawg Topp dawg is offline
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High oil pressure help.

I have a 2003 mc x10 with predator 5.7 indmar engine and my oil pressure gauge stays maxed out when the engine is running. I have replaced the oil pressure sending unit already. I have a new gauge. And when I disconnect the wire from the sending unit the gauge drops to zero. Any help would be appreciated.
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Old 07-20-2014, 11:47 PM
brent79 brent79 is offline
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Did you check the oil pressure with a mechanical gauge maybe you do have high oil pressure?
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Old 07-21-2014, 08:46 AM
Topp dawg Topp dawg is offline
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If I truly had high oil pressure would the gauge max out instantly upon startup? Or would it take a few minutes for the gauge to rise and then be maxed out?
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Old 07-21-2014, 09:24 AM
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CantRepeat CantRepeat is offline
 
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Sounds like you have a bad gauge. If it was a short in the sense wire the gauge would stay pegged when you removed the wire from the sensor. What happens if you take the sense wire and ground to engine? Does the gauge peg?

Some internet stuffs.

http://www.ehow.com/how_7898711_test...re-sensor.html
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Old 07-21-2014, 09:51 AM
Topp dawg Topp dawg is offline
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When I remove the wire from the sending unit while the engine is on the gauge instantly drops to zero. When I plug the wire back into the sending unit the gauge maxes out. My Oil pressure gauge is new as well. When I unplug the gauge while the engine is running the gauge drops to zero and when I plug the gauge back in the gauge instantly maxes out.
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Old 07-21-2014, 10:17 AM
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CantRepeat CantRepeat is offline
 
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Originally Posted by Topp dawg View Post
When I remove the wire from the sending unit while the engine is on the gauge instantly drops to zero. When I plug the wire back into the sending unit the gauge maxes out. My Oil pressure gauge is new as well. When I unplug the gauge while the engine is running the gauge drops to zero and when I plug the gauge back in the gauge instantly maxes out.
With the key on and engine off what happens when you pull the sensor wire off at the engine?
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Old 07-21-2014, 10:30 AM
Topp dawg Topp dawg is offline
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with the key on and the engine off the gauge reads zero.
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Old 07-21-2014, 10:31 AM
Topp dawg Topp dawg is offline
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the gauge only responds when the engine is on.
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Old 07-21-2014, 11:42 AM
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CantRepeat CantRepeat is offline
 
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Well, from what I know and have read the only way to test the gauge is by putting a resistor on it. What the resistor does is act like the sensor but you are taking the sensor and wiring out of the loop. If it still reads bad then its the gauge that is malfunctioning.
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Old 07-21-2014, 11:54 AM
Topp dawg Topp dawg is offline
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If I have a blockage or truly high pressure would the gauge instantly max out or would it take several minutes and slowly climb to 80?
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