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Oil pressure sending switch

Okiegirl

By Okiegirl
in Ask A GM Technician

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Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted
2 hours ago, Okiegirl said:

Since he is not the first owner...could the previous owner made mods to the truck to change the oil pressure?

Not to the point of breaking a oil pressure sensor. Take a look at the oil filter, if it appears to be bulging then you likely have an oil pressure issue. It is still same shape as a new one then you do not have an oil pressure issue. 

Supreme Pizza Senior Enthusiast

Supreme Pizza

Posted
Posted
48 minutes ago, Doug_Scott said:

I have a hard time believing his post was even serious.  

Get a new sender from the dealer.  Use Teflon tape on the threads, your son should have been taught how to apply it correctly. You want to wrap the tape around the threads in a clockwise direction when the threaded end is facing you. Wrap 3 complete turns, pulling the tape tight as you wrap it. It needs to start at the first thread and wrap up the threads.  Teflon paste is another option. Ignore the post suggesting permatex, or any other of his suggestions. 

 

  

 

   As for the Permatex, it is not an ideal solution, its a fail-safe. Its better than blowing oil all over your engine bay and limping home with dangerously low oil. When the sensor fail continues to fail, you replace it. Only difference is that with the Permatex, you are not dumping oil on the road, messing up you engine bay, and stressing your engine from low oil. 

 

   If you don't like the Permatex idea, you could do this: zip tie a plastic bag over the oil sender, and keep a few gallon of oil in the back seat. Same result as the Permatex, but you have to add oil regularly. 

 

   I'm not talking about fixing the problem. I'm talking about damage control. Its like seat belts and air bags - if you can not prevent the crash, at least you can limit the damage. Permatex or a plastic bag will limit the damage. 

  

 

  

 

 

Supreme Pizza Senior Enthusiast

Supreme Pizza

Posted
Posted
1 hour ago, Okiegirl said:

That's a good idea, if it were leaking. It is blowing...every time it has gone out or blows it sprays oil all over the engine and engine compartment. :-(

 

 

  The Permatex will stop the oil leak. Even if the oil sensor is blowing up. The Permatex can withstand 100 PSI+ if applied properly.

txab Senior Enthusiast

txab

Posted
Posted

I'll say it again. Make sure you're not damaging the unit during installation.  As Doug mentions the oil filter will show signs of over pressure. Maybe remove the intake and put the sender on then. Probably needs intake gaskets replaced anyway.

 I would like to see pictures of all these failed units

Supreme Pizza Senior Enthusiast

Supreme Pizza

Posted
Posted

The sender itself requires no minimum torque to work properly. It only requires a minimum torque to keep from falling out or leaking around the threads. If it is being damaged by the installation tools, you could probably just screw it in real tight by hand. You would want to really twist it in there as hard as you can, and it might be a good idea to use some Threadlocker blue ( don't get the thread locker into the oil system). I do not believe that it is failing due to excessive oil pressure, or it would be indicated on the dash gauge. 

 

 

If the part fails when threaded in by hand, you know its either too much pressure a defective part. 

If the dash gauge is maxed out, its failing due to excessive pressure.

If the dash gauge is not maxed out, and it was threaded in by hand, then its a defective part. 

 

I would really try to eliminate the installation tools as the culprit. User error is not uncommon. 

Okiegirl Enthusiast

Okiegirl

Posted
  • Author
Posted

On some of the sensors the core has been busted out and you can blow air through it. the last one was not that way. i dont know if the little washer being somewhat pinched on one side is why its coming out or not. i will admit the first few times i was racing the last few were just cruising around. Not sure what to do. when it blow it shoots oil all over the tranny and everything and smokes horribly. im beyond lost on what to do im tired of replacing them and worrying about it. it scares me to drive it i want it to be solid and running smooth. the oem one is similar to the old ones i believe. i even talked to the local chevy dealer parts guy and a tech and they both had no idea on it so i dont know what to do at this point

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

Get one from the dealer.  Make sure it is in an AC Delco box with the authentic symbol on it.  Start monitoring your oil pressure gauge to see what pressure it is reporting.  If this seems to happen when you run the engine to redline, do that and check the gauge just as it shifts. 

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