C5 Sending Unit Install - Just The Right Amount Of Pressure

How To Replace Your C5 Oil Pressure Sending Unit

Tom Benford Apr 5, 2010 0 Comment(s)
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My first indication that there was something radically wrong was when I glanced at the instrument cluster of my C5 after turning the key to "on"-before starting the engine-lo and behold, both the analog oil pressure gauge and the digital readout on the cluster said my oil pressure was a whopping 73 PSI-and the motor wasn't even running. Obviously, something was grievously amiss under the hood, and my first suspicion was that the oil pressure sending unit had given up the ghost.

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Upon doing a bit of research on the Internet, my initial diagnosis proved to be correct; apparently, this early-death syndrome of the oil pressure sending unit was a fairly well known and not-too-rare occurrence with '97-'99 C5s. From what I read on forums, blogs, and other sources, some other owners with the same affliction simply opted to drive their C5s as-is without fixing the problem. While this is indeed the easy way out, if something else should go awry with the engine, you won't get any early indications without a proper-functioning oil pressure system. Nope, that's not for me; my credo is simply that if it's broken, then fix it.

If you elect to have the work done by the local garage, be prepared to spend between $150 and $200 for the job, plus the price of the sending unit (about $20 additional); or do it yourself and pocket the cash. Here's what it takes to do this job. here.

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Time: about 3 hours
Tools: sockets, swivel socket attachment, screwdriver, wrenches, pliers, lock-grip pliers, torque wrench

Torque Specs
Intake Manifold Bolts (First Pass in Sequence) - 44 lb/in
Intake Manifold Bolts (Final Pass in Sequence) - 89 lb/in
Fuel Injection Fuel Rail Bolts - 89 lb/in
Throttle Body Bolts - 106 lb/in
Oil Pressure Sensor - 15 lb/ft
Engine Wire Harness Clip Bolt - 37 lb/ft
Engine Wire Harness Ground Strap Bolt - 37 lb/ft




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