jeanpxrk

My 97 c5 is leaving some oil marks on the floor.
I noticed that when the car sits, it doesn’t really leak but when i let the warm up in the morning then i see oil on the floor.
it comes from the rear of the engine. My oil pressure sensor IS bad but just wanna see ways i can narrow it down to make sure it is my oil pressure sensor.

RedC5

Take the Corvette top cover off and get a flashlight to look down at the sensor behind the tight area behind manifold - it has a yellow top connector - most likely you will see oil on it.

cdee63

Seeing mine did the exact same thing, I would bet a dollar it is the sensor. They are a known problem. With the covers off idling I could shine a light where it is located and see the oil coming from the junction of where the metal housing and plastic center, it was leaking pretty good. When you do replace the sensor do a search on oil sensor relocation, makes changing one a couple minute affair vs removing the intake manifold to do it.

Bill Curlee

I use a mirror and a good bright flashlight to inspect it. Its a 97! IMHO, I would remove the intake to replace instead of trying to do all the different short cuts used to sidestep removing the manifold. That way you can replace the old worn intake gaskets/O-ring seals, Injector seals, clean ALL the oil out of the inside of the manifold, Clean all the trash/sand /dirt out of the space between the head and the manifold. You can Clean the Throttle body and blade. Clean the MAF.
I would also attempt to lengthen the short nylon vacuum tube at the back of the manifold. Makes life easier.

If you have the chance, you can find a 2001-2004 C5 intake for a few more HP/TQ. Easy up-grade. I would also clean the injectors while there out. Easy DIY process.

If you need some coaching, just drop me a PM. We can talk. This is NOT a difficult job, even though it looks and seems like it.

Bill

mike venth

go to the forum search area and type in "Oil Pressure Sensors Removal and Replacement" and you will find some great info.
good luck,
mike v

grinder11

The C5 intake is the easiest intake I've ever removed on a V8. No coolant in it is a big part of it. Before removing it, I'd get a can of Gunk, and spray it down. Then use ONLY a garden hose, NOT a power washer, to rinse it all off. Then maybe use compressed air from a couple feet away to blow off any remaining junk. This will help eliminate any dirt or debris, if any, from falling into the intake ports of the head. All you need is a 10mm (?) socket, a fuel line disconnect (not totally necessary, but makes things easier), unplug the TB, a screwdriver to disconnect the airbridge, and unplug the 8 injector pigtails. Been awhile, so I may have forgotten something, but this will be a damn good start.....

Bill Curlee

People get the heebeegeebees about taking their engine apart because it looks complex. When I first got my 98, I had that same feeling. Once you dive in and getherdone, its EASY!
Then, the MODIFICATION BUG kicks in and its a down hill spiral from there. LMAO!

Tron Z

^ This
It's all down hill from there, eh? lol

You will need a special tool to release the fuel line, but removing the intake on an LS engine is far simpler and easier than an old school small block Chevy engine. Be not afraid. So long as you don't drop anything down the intake ports, you'll be OK.

Bill Curlee

To just remove the intake from the engine, I have NEVER had to disconnect the fuel lines from the fuel rail. Once you pop all the injectors out of the intake, the fuel rail and injectors are easy to move around. I just get a piece of cardboard, lay the cardboard on the windshield and flop the injectors/ attached to the fuel rails over onto the cardboard covered windshield.

On the other hand, IF you want to for what ever reason, remove the fuel rails and injectors from the vehicle; YES, you will need to disconnect the fuel line. ,

BC

Tron Z

I wouldn't have thought there was enough slack in the fuel line for that.
Thanks; I'll give that a try!

mike venth

Replace the pads under the Intake. They should cover the knock sensors to keep dirt out.

remember to torque them in order.