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Old 03-13-2011, 09:07 AM   #1
Longhorn03
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Oil leak

Cleaned engine checking for leak and this is what I found. It seems to be coming from block by starter some where. OIl pressure gauge has always read normal and still does. No issues. Turn the key to the on position and it cycles properly and reads no pressure. Start motor and reads normal no high readings ever. I will try to attach pics to help.
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Old 03-13-2011, 09:10 AM   #2
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Sorry hope these pics come out.
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Old 03-13-2011, 09:21 AM   #3
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Mine is leaking from the exact same spot. I will find out what it is this week. Let us know if you beat me to it. I'll be using some dye to pin point my leak.
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Old 03-13-2011, 01:31 PM   #4
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I will try to find out exactly what it is. I hope not the rear main. I feel better now that the Junkman is here.
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Old 03-13-2011, 02:39 PM   #5
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I will try to find out exactly what it is. I hope not the rear main. I feel better now that the Junkman is here.
Going on 3 years buddy. My favorite forum by far.
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Old 03-17-2011, 08:46 PM   #6
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Oil leak help please. It seems like it is coming from above the starter.
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Old 04-08-2011, 12:19 AM   #7
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Okay, so I found the source of my oil leak. It was not the rear seal (thank God). It was a combination of two things. My camshaft position sensor and my oil valley pan gasket. I will do a basic write up here soon but this is for those who may be experiencing the same leak as I had.

The way that I figured it out was by looking at exactly where the oil was leaking. It was coming down and around the bell housing, which told me that it was coming from the top of the motor somewhere. The only thing that I knew of that could leak oil from up there was my oil sending unit. Since I had relocated my sending unit, I thought that maybe my adapter that replaced my oil sending unit was leaking. That was not the case. In this picture, you can see that the adapter was pretty much bone dry. However, my cam shaft position sensor was caked with oil (already removed in this picture).




Here's a shot of my camshaft position sensor. Notice the blue gasket around and near the bottom of the sensor. There should NOT be any oil up past that blue gasket. Mine as you can see does. Since oil was being forced up past that gasket, that was one of my two places that oil was leaking.




By looking at this next picture, you can see that oil is present at the front of the motor, where the throttle body is located. There should be no evidence of oil at that location.




Because of these findings and the fact that I had disassembled this much stuff, I decided to replace the oil valley pan gasket too. There is no other location on the top of the engine that oil is pressurized that I haven't addressed so I figured that this would solve my issues.

If you replace you cam position sensor, you may have to perform the Idle Learn Procedure. You may also need to reprogram your fobs, as detailed in your owner's manual. The fob thing baffles me but that's what the service manual says.


After reassembly, I cleaned the engine and undercarriage and then took the car out for a serious thrashing. All evidence of leakage was gone.

This has solved my issue and hopefully will resolve yours too.

Here are the GM part numbers for the items I replaced. The cam position sensor:




The valley pan gasket:



Here's a wide shot for orientation purposes (for those who would need it like me ):

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Old 04-08-2011, 05:16 AM   #8
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That is good news for you. I guess I will start this project soon. I have never removed intake before. I hope this is the same leak I have. Thanks
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Old 04-08-2011, 09:33 AM   #9
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Does you engine show evidence of leakage forward of the valley pan gasket? If so, you are in the same boat as I was. If you use my instruction for replacing/relocating the EOP sensor, removing the intake is a breeze. I will also do a writeup for this to include the valley pan gasket and cam position sensor.
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Old 04-08-2011, 07:34 PM   #10
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Outstanding write up with pics Junkman.
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Old 04-08-2011, 08:31 PM   #11
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I will check to see if oil is around the valley pan this weekend. I ran into being assistant coach for my sons baseball team and time to work on toy has been put to the side for now.
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Old 04-09-2011, 08:40 PM   #12
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Outstanding write up with pics Junkman.
Thanks Sarge. I'm in your neck of the woods this weekend. I did a detailing clinic in Atlanta. Are you anywhere near the freeway that I'll take to get back to Louisville?
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Old 04-09-2011, 09:00 PM   #13
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Yes. I have oil on front of valley pan and all over pcv vaulve. Every thing is kind of oily and dirty. This is a must clean and fix now that I have seen how messy the engine is now. Thanks for pics. Local parts had the cam sensor for $45. Should I use this one or go to dealer?
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Old 04-09-2011, 09:14 PM   #14
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Originally Posted by Longhorn03 View Post
Yes. I have oil on front of valley pan and all over pcv vaulve. Every thing is kind of oily and dirty. This is a must clean and fix now that I have seen how messy the engine is now. Thanks for pics. Local parts had the cam sensor for $45. Should I use this one or go to dealer?
That's totally a preference thing. Some things, like a windshield washer motor are not critical to the car's operation and I won't pay dealer price for them. The same for the coolant overflow tank. Something critical to the engine is a different story. I'll pay full price for that gasket. I didn't know how critical the cam position sensor was but it sounded important so I got the GM one.
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Old 04-16-2011, 07:24 PM   #15
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Mine is leaking also first I thought it was the PCV hose because it was dry rotted in 3 places,which probably caused some oil leakage,I changed my valve cover gaskets next will be intake and lifter vally gasket,good write up Junkman very helpfull..!
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