So I built the motor to drop into my gto. Gen iv lq motor, at first start up the engine puked oil all out the back of the engine. Oil pan looks dry. Any ideas on what to check? I'm just feeling like **** now that I've invested so much money and time and now I'm back to square one. Yay I get to pull the tranny again -__-

 

Did you forget the rear main seal or something?

 

I put the rear main seal in. I remember pressing it into the rear cover.

 

Try looking behind the manifold for the oil pressure sending unit.

 

^This!

 

Oil pressure sending unit. To see if it's installed? Or what should I be looking for? I installed it but it didn't look like it was right. It was just threaded into the valley cover. In the back but not actually in the block itself. Hopefully that's all it is.

 

This is the motor before it went in. Pressure sensor looked kinda funny to me, is that right? It's a gen iv lq4 with donor parts from the 04 gto.

 

So could it be the valley cover i uave installed is wrong amd allowing oil to leak from the top? I felt around the oil pressure sensor and i can feel oil back there so it has to be coming from that area.

 

Yeah it's possible. I just don't think a whole lot of oil gets up there though. The OPSU however is fed pressurized oil so if the seal is broken or the sensor isn't tight, it would dump a lot of oil quickly.

 

Ya it was a lot of oil and the car only ran for maybe a minute. It made a pretty big pool under the car. So I'll have to double check that and make sure it's installed correctly. Idk how it's supposed to read the pressure if it's not threaded in the block???

 

Did you have pressure on the gauge?

 

I had a k&n oil filter do that to me blew out the bottom pissed oil everywhere new non k&n filter never had that issue again

 

What valley cover do you have on there...?

 

The display said low oil pressure. Probably spit out half the oil. Any other things I should check out? I'm gonna disassemble top of the motor (intake, Valley cover etc) to make sure it's not leaking out of the pressure sensor hole. Hopefully that's all it is.

 

Possibly the wrong gasket for the valley cover?? They have a couple of designs.

 

@shoebox I'll look into that and make sure it's the right one. It seemed to fit it but just to be sure I'll look again tonight when I open it up. Thanks.

 

So the oil pressure sensor is supposed to go into this hole correct?

 

And the winner is...... shoeboxvette lol.



What a stupid mistake lol but i appreciate the help and ideas and all. Thanks everyone.

 

Good to see you found the problem.

 

I'll admit I laughed when I saw the pic.

I'll also admit that myself included there isn't a person on the boards who hasn't done something just as dumb.

It's nice when folks post it so others can see what happened. Sometimes obvious is only obvious after it kicks u in the nuts.