Travose21

iTrader: (22)

when i crank it up it reads fine, and when i drive it or race it and car get to normal operating temp it reads low and jumpy, but when i give it gas it is perfect what can that be.

mannyman84

iTrader: (2)

Attach an external oil pressure gauge and make sure it's not your sending unit

ls1wallen

I have a s10 that does the same thing. Waiting to see what others say as well.

Travose21

iTrader: (22)

ttttttttttttttttttt

armyboyatc

iTrader: (29)

Bringing this back. Mine does the same thing. 20 - 25 at a hot idle and 2,000 rpms 40 - 45 and at WOT is 50 - 60. Any idea why?

mannyman84

iTrader: (2)

because that's pretty normal.

armyboyatc

iTrader: (29)

Really? I have a friend who has a 02 SS and he says that his is 40 pounds at hot idle. We run the same oil. Mobil 1 10w30

mannyman84

iTrader: (2)

All engines are different in that matter. I have friends that run lower or higher then me. Stick with the 5w30 it's recommended by factory for our cars. Better oil flow at cold starts

02ws.sik

How many miles are on the car. You can tell if the motor is getting worn out or burning a lot of oil. Mine is above 40 at idle and wide open its a lot higher.

02ws.sik

I run 10w30

armyboyatc

iTrader: (29)

It doesn't burn oil. The car made great power on the dyno. It seems to be in great condition but the low oil pressure at idle concerns me. I'm in south Florida so I don't gave to deal with the cold. I like running a bit thicker oil here because it gets so damn hot and there is lots of stop and go traffic due to all the old people. No offense to anyone on here lol.

Pewter53

iTrader: (36)

mine runs the same army boy when i first got the car i was worried bc i had a lsx truck before and idle was 50 plus . I was told it was the small oil pan and not as strong oil pumps that caused this.

02ws.sik

That could be it your oil pump to not working as well as it should be.

mannyman84

iTrader: (2)

How cold does it get in the morning?

armyboyatc

iTrader: (29)

It's like 55 - 60 this morning.

mannyman84

iTrader: (2)

Yeah I would say stick with the 5w30. It's about 50-55 here in Cali where I am.

Monte LS....1

iTrader: (3)

If it helps to ease your mind any, my 90 caprice before and after the 350 rebuild idled at about 25 when warm and raised while driving and raised even more at WOT. same goes for the sbc in my 63 impala and two other ls engines i had. Id have to agree with the manny.

yoshgixxer

iTrader: (74)

yea i had the same question.. all the other LS cars i owned had 40 or more at hot idle but that is on the crap factory gauge..i am looking at a car with a built LS6 motor with less then 2000 miles on the motor it had 20 psi of oil psi on a autometer mechanicle gauge at hot (190-200) operating temps around 50 at wot. i told the guy before we do the deal i want to switch out the pumps. we put a mellings high volume pump ( which states it WILL NOT increase oil psi at idle in the instructions) turns out the car now has 30-35ish psi at idle at 190 deg. and over 70 just wacking on the throttle. I dissasembled the pump in the motor and it was just a stock ported pump with a stock spring and no shims... so id say it was just a used worn out pump. i didnt notice any bearing material in the oil when we drained it and the filter looked clean.so im sure the tolerances inside the stock pump gearator were just a little sloppy.

oil used was mobile one syn 5w30

FWIW all data says 9psi at idle is considerd "in tolerance" lol

Monte LS....1

iTrader: (3)

yeah usually 10psi per 1k rpms is considered acceptable.

jbridwelltransam

iTrader: (12)

Mine does the same thing. A little over 20 something at idle. Gauge also seems to hop a little bit.