So to start off I’ll say my car has 110k miles and has always had early maintenance, 3k mile oil changes and everything done maintenance wise to the extreme. So I’ve never had anything burn or come out of my exhaust. But I had a knock sensor go bad and I went to replace it. So I removed my upper and lower intake and replaced my knock sensor. Not fun but wasn’t hard and I’ve done it before doing my valve covers. I put in new gaskets and cleaned all surfaces but when I started it up it was pluming smoke. Wasn’t sweet smelling had to have been oil. I’m unsure of why. I tightened everything and replaced all gaskets. Replaced my pcv valve in the process. Well as I mentioned I’ve never had anything burn prior to this job but everything is tight and knock on wood but there’s no way my engine is messed up. Do y’all think the gaskets are bad? Or what could I have messed up on this job to cause oil to burn. And it’s a lot of it too

 

Do u have the iso thermal spacer? Any chance u hooked up a coolant line to your plenum by accident?

 

Sounds like you replaced the valve cover gaskets too? Did you use Permatex Ultra Grey (or equivalent) around the front corners?

 

I did the valve covers about a year ago with no problems, I know where to use the gasket maker. Problem happened after replacing knock sensor so I removed the intakes upper and lower plenum and lower intake manifold

 

all I have is a cold air intake. I just bought the Motordyne 5/16 spacer , I live in Virginia where it rarely gets below freezing. So I’m not going to use the throttle body heater. It’s possible but very unlikely, I work on cars for a living but our intakes are different than most other cars. Is there any way you could link a diagram to the throttle body of which hoses go where? Only hoses I could have messed up is the coolant hoses to the throttle body which again is unlikely. I don’t think it’s burning coolant but oil. It doesn’t smell sweet at all and I think the plenum gaskets are stupid the way they bolt in on the lower plenum. I’m 99.99 percent positive it’s leaking oil inside of the plenum. Thank you for the feedback

 

Check all you PCV hoses and the PCV valve. If the crankcase isn't venting it could be forcing oil into the intake or past the rings.
There are only two coolant lines leading to the plenum, and they are short enough and oriented that I can't imagine them being easily swapped, nor would it matter as its only coolant to warm up the TB.
I just did the knock sensor + sub-harness and installed a motordyne 5/16 spacer a few weeks ago on my 04 G. I can't think of anything that would lead to huge oil burning from installing one.

 

I replaced my pcv valve and blew out the hose in the process, but when you split the upper and lower plenum there are 6 bolts on a plate that hold in the lower plenum and the gasket for the upper and lower plenum. Under that plate there is oil passages and I think that’s where the problem is from. The videos I’ve seen from the Plenum spacer install it looks like you don’t even use that plate anymore. Is that true? And if not would y’all recommend using gasket maker under that plate? Thank you for your feedback

 

I re-used that plate. I had an extra new plenum gasket on hand, and I cut out the middle and used it so that that plate still seals to the lower plenum. I saw Motordyne says that you don't need to reuse that plate in their YouTube vid, but I feel that the OEM's designed the PCV circuit that way for a reason.
How much oil is the car burning? Are you checking the level after the car sits for at least 15 minutes? The VQ's circulate a lot of oil in the heads since they are solid lifters, and it takes a bit for the oil to drain back into the pan.
My 04 G @166k miles burns <1qt/2000 miles. I had an 05 with 250k+ miles and it burned over 1qt/1000 miles. I plan to add an oil catch can in the near future.
I would not use gasket maker, as the engine creates a lot of vacuum and I wouldn't want any RTV to get into the engine nor the little orifices under that cover.