oil pressure sender dead... How much, and where is it?

[SStrano]

Subject line says it all. I have a junk sender that I need to change (or have changed). Where the hell is it? How much is a new one? My local dealer has done a great job of blowing me off about this... .



Thank you for any help you can pass along.

 

[SBashaw]

Don't know what year truck you have, but from what I have heard the newer trucks don't have an oil pressure sensor because the oil guage is only showing what the oil pressure should be by looking at your RPM's and water temp. Some one correct me if I am wrong Please

 

[SStrano]

My bad... didn't think about the sig (or lack of one)... . It's a 04. 5 600. Sender, switch, I don't know on this thing. It has pressure all the time driving or when stone cold at idle. Only acts up when warm @ or close to idle.



I know there is pressure becaue the load doesn't even go up 1% when the "pressure" bottoms. It's also happened enough that it'd have blown up by now.

 

[dan.poitras]

Our trucks have a oil pressure switch. (Not a conventional sender)

Our trucks have what's been called a virtual oil pressure guage. It reads what we are expected to see. (Not a good thing)I'm not sure where it is

Someone?

 

[nickleinonen]

you got yourself a glorified hobbs switch. . 6psi it shows pressure, less than that it shows none. .

the switch is on the left side of the engine, behind the ecm on the engine block. the green colored connector below the fuel filter canister in the picture below is where the switch is.
-


check your oil for fuel contamination. . hot idling is when fuel dilution will drop pressures low enough to trip the switch

price for the switch is in the $30 range i believe

 

[Van Blom]

Nick, would this be a good place to put in a real pressure guage sending unit?

 

[Johnstra]

There are a couple of additional ports on the same plane as the one the OEM switch is in. Any of those would be good for a pressure gauge. You can also use the port on top of the oil filter housing.

-john

 

[SStrano]

I'm sure it's not fuel in the oil. Mileage is fine, and it did it some 10 minutes after an oil change w/Premium Blue (as well as before that, and since). Been on and off for about a year now actually.



I appreciate the help on locating the switch. Thank you!!!!

 

[nickleinonen]

Nick, would this be a good place to put in a real pressure guage sending unit?

as in the post a few above this one, there are some more ports in that same gallery that could be used. . there are 2 M10x1. 0 orb plugs that can be used [one above the ecm, one behind the cp3] and 2 M14x1. 5 ports. one is used by the stock switch, the other is inaccessible due to the fuel filter mounting bracket.



i am using the one above the ecm. . i used a copper washer to seal it, but i don't recommend that. use an o-ring or rubber bonded washer to seal any adapter fitting used



the cast iron quality and very fine of a thread didn't like me tightening to seal it. it isn't leaking but i think i may have damaged the threads in the block.