c5formula

iTrader: (55)

so i picked my 99 z28 up from the shop today with the new motor in it (stock motor from 2000 ta with 17k on it), and i noticed that the oil pressure isnt even half of what it used to be. at cold start up it sits around 35psi an once it warms up it sitts around 20-30 psi. at crusing speeds its at about 35ish an under wot it wont go above 40psi even while im knocking on 6000rpms. now while its under load an i go to **** gears as soon as i hit the clutch the pressure jumps up past 40 psi but goes right back down once i get back into it...

anyone have any ideas about this, any help at all would be great. thanks

69LT1Bird

iTrader: (1)

check it with a real mechanical gauge to see actual pressure before you get too worried.

99RTA

iTrader: (-1)

You better have more than 40 psi at 6k! I wouldn't run it hard until you sort this out.

bigboykilroy

iTrader: (48)

10 psi per 1000 rpm is the general rule.

c5formula

iTrader: (55)

well i just got it back from the dealership yesterday as it was in the shop cause the oil pressure was worse before. it would idle at 18-20psi would be at 20psi around town and would barly reach 35-40 under wot before i put it in. all they did was put a new oil pressure sending unit in the car. they said they put a mecanical gauge on it an the pressure was a lil higher than the gauge was showing but that was before they put the new sending unit in the car...

edzsilverss

iTrader: (4)

I know this sounds basic but did you check the oil level. If mine is low on oil, it will read a lot lower than when it's full.

bigboykilroy

iTrader: (48)

I bet you that the oil seal on the pickup tube is not sealing correctly.

bigboykilroy

iTrader: (48)

also what oil filter are you running????? I have seen similar issues like this with a FRAM OIL filter.

kblehm

iTrader: (8)

I have the same problem, I start my 01 camaro and I'm at 40 PSI and when the oil warms up the oil pressure drops to about 25 PSI and when I give it WOT it shoots back up to 40 PSI. I just got done putting in a TSP cam and SLP LS6 oil pump about one month ago and have been having this problem. I dont know what the problem is on mine yet but I will be dropping the oil pan and checking the pick up tube for the oil pump. I wish I was more help but your not the only one out here with these problems.

Another ? for everone here. Dont they sell a two bolt style pick up tube to keep from twisting the oil pick up tube?? I have searched threads and cant find it.

01ssreda4

iTrader: (96)

that happened to me. fram is the devil...

silverLSWON

iTrader: (16)

oil pickup o ring is usually the problem or it might be signs of the oil pumping getting weak

c5formula

iTrader: (55)

so what should i tell the dealership when i bring it back to them? i know they gonna say nothings wrong with it, that its within working ranges but i know that its not right. i actually called the guys over at futural motorsports an they told me that it should be 35 to 40psi at idle, 45+psi at crusing speeds, and at least 10 psi for every 1000rpm so at 6k it should be 60psi+...

c5formula

iTrader: (55)

yes the oil is full from what i can tell on the dipstick. also im not to sure on the oil filter as i havnt been able to get the car in the air yet.

c5formula

iTrader: (55)

is there a way to test to see if this is the problem? also is there a way to test the oil pump to see if its ok?

kblehm

iTrader: (8)

Does anyone know the answer to my question?? I thought I have seen it before on the website??????

01ssreda4

iTrader: (96)

kblehm

iTrader: (8)

Found the thread and it only took me one week to find it. Getting mine tomorrow!!!! and yes I might have but it was only to help!!!!

https://ls1tech.com/forums/new-produ...p-hotrods.html

c5formula

iTrader: (55)

any idea as to what i should tell the dealership guys when i bring it back in to them?

kblehm

iTrader: (8)

My thought is its either your oil pump or its your pick up tube that is twisted and sucking air. I'm sure the oil tube is my problem and I'm ordering the two bolt set up which should fix my problem.

Have you used a mech gauge and tested the oil pressure. Our gauges are known not to be the best and accurate.

99RTA

iTrader: (-1)

Ask them to show you the min oil pressure specs in the gm repair manual...they can't argue with that.