Oil Leak

Jasonsupafly · July 4, 2012

01 Z71 5.3 155k miles

Apparent oil leak. The filter had an oil drip on it also that I wiped off. Wherever has been leaking for a while now but I cant tell where from. I got my mechanic to also look at it when it was in for a trans service once also and he claims he couldnt tell where it was coming from either. Has anyone seen this before? Any ideas? The bolts for the starter in one of the pics has oil on both of the bolt heads.

Thanks for any help!

txab · July 4, 2012

Check the crankshaft position sensor above the starter for leaking. Also check the area where oil cooler lines attach, if equipped. If not equipped check the block off plate in that area

Z45 · July 4, 2012

GM BULLETIN #05-06--01-034L: 5.3L, 5.7L, 6.0L, 6.2L, 7.0L - Engine Oil Leak at Rear Cover Assembly Area (Engine Block Porosity RTV Repair Procedure) - (July 23, 2010)

DOCUMENT ID: 2506955

Gurrzt · July 4, 2012

On my 2001 Camaro Z28 (Sara) my leak was from the sensor located behind the intake manifold.

darkirish63 · August 27, 2012

So...was it the crankshaft position sensor or something else? Having the exact leak myself and have checked every conceivable source (besides the main seal since the motor is newly built with only 750 miles on it). If so...how difficult was it to remedy? Thanks...

Jasonsupafly · August 28, 2012

Still have no idea where its coming from..Hard to tell with that mess over everything...

txab · August 28, 2012

Also look at the oil pressure sending unit

darkirish63 · August 28, 2012

Did you pull the starter out in order to visually inspect the CPS in order to rule it out as the source? I'll be changing the oil for my second 500 mile break-in period on my new motor and will be pulling the starter to get a look at what I believe is the CPS leaking. Don't believe its the rear seal - not enough oil leaking for that IMO. Will post my discoveries or tragedies..

Jasonsupafly · August 29, 2012

I havent done anything further to locate the leak..I have it in my plans to pull the starter to check the cps when it cools off a little bit down here...Let me know how it goes..

CapitalTruck · August 30, 2012

Man, between the coolant and the oil leak you've been having a hell of a time recently.

ujtruck · August 30, 2012

Check the crankshaft position sensor above the starter for leaking. Also check the area where oil cooler lines attach, if equipped. If not equipped check the block off plate in that area

+1 i too think its a CPS leak

Jasonsupafly · August 30, 2012

Were gonna get it taken care of though man...I sure hope thats where its coming from...Should be an easy fix if it is.. I hope..

Jasonsupafly · August 30, 2012

Guess ill go ahead and ask..Is this a pretty easy fix if it is the CPS? The starter pretty easy to drop down?

CapitalTruck..Had to replace the fuel pump a month or so ago then the radiator a couple weeks back. Other than this little oil leak ive had no other problems that I can remember (knock on wood)...Think I have 156k on it and I can honestly say it's been a damn good truck..I would love a new one but having one thats paid for and thats been well taken of is a good feelin'...

Wires · August 31, 2012

I'd wash it all off so you can hopefully identify the source. Wind from driving and the engine fan will blow oil everywhere, so it's really hard to identify over time since everything gets coated.

CapitalTruck · August 31, 2012

Yeah, you got that right. Financially it almost never makes sense to buy a new vehicle. I have 165k on my 2004 and I plan to keep going. The new models draw me in, but like you said, not having a car payment is serious freedom. I mean, a 600 buck repair (what I would consider to be expensive) is only two months car payment.