No oil pressure question.

[Witt51]

I have 2011 ss with a ls3.My mods are tsp cam, tsp headers, ported polished heads, ud pulley, roto-fab intake, MELLING OIL PUMP.

I had the engine built about 30,000 miles ago by Chad Barton from CBI. So yesterday I took the car to the dealership to get the air conditioner TSB taken care of. I picked it up and drove less than 10 minutes home. About 2 hours later i went to go somewhere, fired the car up and no oil pressure on the gauge and the warning light was yelling at me. I think it's odd that it ran great and then all of a sudden doesn't have and pressure now. I didn't hear any loud noises, clacking or anything unusual coming from the engine. I wouldn't think the TSB wouldn't effect the oil pressure reading. So I'm hoping its the oil pressure sensor. So if anyone has any ideas or anything else to look at I would appreciate it.

[BlackM6RS/SS]

If you didn't hear valve train/lifter noise then most likely is the sensor.

[Witt51]

That's what I'm hoping . Would the noise be pretty obvious and noticeable? I take it the only way to know is to install the new one and fire it up?

[BlackM6RS/SS]

Yes if you had 0psi oil pressure or low for light to come on, you would hear loud ticking noises which would be the top end, lifters.

There is a way to test with a mechanical gauge but I don't know how to check it like that, maybe someone who does will chime in.

[Witt51]

Ok thanks again. Like I said I haven't heard any noises or anything out of the norm. My builder is also leaning towards the sensor. I haven't really seen one having problems with the melling oil pump. Do you or anyone else have directions or know how to change it out?

I appreciate the help

[epstein]

2 things I have discovered... If your due or close to it these sensors are fickle.... and .... These sensors are fickle...... LOL....

you can also check oil pressure at the filter but that is another story.

[Russell James]

I'd have the dealer look at it. That close to when they were working on it, mostly likely they bumped a wire or something.

If it idles normal, it has oil pressure. The lifters would be knocking like crazy without oil pressure.

Look at the very back of the intake manifold by the cowl. I think that is where the op sending unit is. See if you see any wire connections off.

[Witt51]

I am going to call them on Monday. I'm not sure how close they would be to that plug or the wires for it while programming for the a/c. They did some body work on the hood and passenger side windshield pillar. So I'm sure they had to take the hood off and dismantle that area for painting. Would the lifter knock happen right at start up or does the engine have to idle for long? It ran long enough to go through all the self test of the gauges. I actually started it up once after that also. Never did hear the lifter knock

[Russell James]

Loud knocking right away.

[litle88]

Did they remove the intake at all that you know of? I don't know what that tsb consists of.

If so then they might have broken the sensor out back. I don't think I would EVER leave my cars at the dealer without me being there. They hire some dumb porters and I've seen them abuse cars as well. I just HOPE it's not the case here. Please keep us posted.

[dekan513]

my car did the same but it was the oil pump. if im reading it right. drove fine to town. got a pizza walked back out started the car no oil pressure . all lights come one and i shut it off. no noise or nothing tho. but didnt start it back to see if it would start clacking . broke it down and oil pump.
it ran for a good 5 + sec. all the gauges ran over and stuff but no ticking. just my case tho.

[litle88]

Originally Posted by dekan513

my car did the same but it was the oil pump. if im reading it right. drove fine to town. got a pizza walked back out started the car no oil pressure . all lights come one and i shut it off. no noise or nothing tho. but didnt start it back to see if it would start clacking . broke it down and oil pump.
it ran for a good 5 + sec. all the gauges ran over and stuff but no ticking. just my case tho.

Was it a melling?

[Witt51]

^^^^ that's what I was going to ask also.

I went and bought a sensor but kind of nervous to put it on and see if that fixes it. I'm going to call the dealership tomorrow and let them know. I doubt they will do anything about it since I have done all that work and will blame it on the part. I'm not really sure what to do besides find someone in the area that has experience with these engines. I haven't heard of many melling pumps going out and mine has 30,000 miles on it. Most miles are highway miles and car has never been tracked before. Any ideas would be appriciated?


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[redredrage]

Originally Posted by dekan513

my car did the same but it was the oil pump. if im reading it right. drove fine to town. got a pizza walked back out started the car no oil pressure . all lights come one and i shut it off. no noise or nothing tho. but didnt start it back to see if it would start clacking . broke it down and oil pump.
it ran for a good 5 + sec. all the gauges ran over and stuff but no ticking. just my case tho.

in case you didn't know there is a tsb on the oil pump for this exact issue because of the relief valve sticking.

many have had thier oil pumps and belts replaced for this issue