Big Oil Pressure Drop?

[Emeraldage]

I have a 89 NA. Had it for 2 years now. It's always had pretty strong oil pressure. A warm idle will be 10+ And warm driving will be 35 or so. And a cold start idle would be 35psi area. I drive it like every other day, since my dad sold his car he drives it every day all over the place for work and all, and man it's mad ea big difference car drives so much better.

Anyways we noticed yesterday now startup is 10psi or so.. Warm idle is like 8 I think. 3000rpm gets me like 18psi maybe, and 4000rpm will get me 20psi. I know supras have high volume low pressure oil systems and wondering what this means to me? Car doesn't seem to run any different feels just fine, I smelled burning on my first trip home BUT I just had a resonator put on the exhaust so can't confirm it's from the engine.

History:
Burns a wee bit on startup

Leaked oil at the to of the engine, fixed but replacing those 17mm allen bolts with gaskets under them as well as a new seal for the cover. Still a little oil sits on top of the engine probably why I smell burning sometimes.

A new problem occured like last week, racing some super cool hill billy truck (Lul was funny) after I noticed the car kept miss firign when I was driving, basically felt like I dropped throttle for a second many times driving through my neighborhood. Before and after that still drives fine, like maybe once every 3 drives it happens once but very minor.

Also mention this car has 220k miles on it all stock. We still have a 7mgte ready to put in once we afford to buy studs and gaskets to put it in.

 

[hvyman]

Can do a compression test and check all your plugs.

Also the stock gauge isnt the greatest. Getting a oil pressure test gauge ad getting some actual numbers would be the best bet to find out what kind of pressure you actually have.

 

[Dan_Gyoba]

Have you washed the engine recently? Sounds like what happened to me when my TPS went south. Try unplugging it and see if the throttle problem goes away.

For oil pressure, yeah, get it checked with a good gauge. Also weird electrical things can happen around that sensor. It's decent enough.

And the "High volume low pressure" thing is BS. Pressure isn't as high as it is in other engines, but the GE particularly doesn't do particularly high volumes. (The GTE slightly more so, because of the oil squirters.)

 

[Emeraldage]

Thanks for the answers but it was just something stupid as basically it had no oil in it. Since my dad drives it all the time now it burns like 4 quarters in 2-3 weeks now it seems instead of me added a quart once a month. Dumb me I guess haha. Misfiring thing still is in issue and happens once I kind of rev it higher typically and then when I hold my speed it'll misfire. And it's likely plugs/wires because they were sitting in oil for the longest time. But obviously we don't have the money to really do anything of course. Would rather just spend it for the darn gaskets and head studs for the 7mgte sitting in the garage.

Random question. Will my stock fuel pump work on the 7mgte? Just will have 3" exhaust, and stock downpipe with a aftermarket elbow. Most everything else stock.