mre1974

I did some research and have seen plenty of threads about high oil pressure usually being a bad sensor. Well, does it work the other way too? Have the bad sensors been known to show "low" oil pressure? The reason I'm asking is because lately I've noticed that when I start mine cold she idles at 30-32 psi. When driving increases up to around 40-42 psi (4,000 rpm and above). But when idling and around 1200-1500 rpms once warm and up to temp it's been hovering around 19-22 psi. Granted it's been in the high 80s and low 90s but that just seems low to me. Car has 102k miles and I'm running 5w30 mobile one. Does this sound fairly normal? Am I worrying about nothing? Thanks for any insight.

dgrant3830

That sounds very normal too me. Will give you some respective info on my super high mileage '99..the other day I was stuck on the freeway out here due to a truck fire. My oil pressure was hovering around 10-12 psi. Yes, I know all too well its getting to be time to rebuid the lower end and put in a new pump. I have the new pump already and a new timing chain/gears and have to start acquiring bearings and so on.

Minimum to run is 6 psi

mchicia1

The question is not the raw value of your oil pressure...it is the change...

Has it always idled at 21 psi when warm? Or did it drop like 10 psi or so? Because if you did notice a drop, then yes, you may have a problem.

SLVRCPE

^^ Agree..

Mine only has 58k on the clock and has always had what I consider "low" oil pressure.. Mine will show 45-50psi cold start and then ventrure down around 23psi at 210. However, the oil pressure increases and decreases with RPM at operating temp.

sabastian458

Could also be the oil you are running and the temps outside. I notice a large diffence in my 3500 ram between cold and warm weather idle oil psi's (really havent driven my vette enough to get an accurate opinion with it.)

2KFRC5

Per the 2000 service manual, minimum oil pressure (hot) is 6 @1000rpm, 18 @ 2000, and 24 @ 4000. No maximum is listed.

snooks

1999 hardtop with 61000miles, engine light comes on after warmed up and noticed 12-18 psi oil pressure at idle then 28 to 33 psi when reved up. what could be the problem? do i need an oil pump? how to check sensor etc...

snooks

had no problem until added headers and stage 2 procharger upgrade, now runs great but engine light comes on with oil pressure low after warms up 10 to 16 psi at idle and 33 to 38 on reving engine. could it be oil pumm with only 61000 miles on the car? could it be sensor? HELP?

65GGvert

Highjack alert!!

cruisemon

For the OP - how many months and how many miles since you changed the oil?

Charlie

fallen

After my recent rebuild I have made the following chart. If I notice a sudden deviation from this chart I know I have a problem. I am using mobil 1 15w50, mobil 1 filter, and have an oil cooler.

Here are my numbers:

RPM x 1K (Column 1) TEMP (column 2) PSI (column 3)
1 93 49
1 135 43
1 147 42
1 150 41
1 160 39
1 170 37
1 175 37
1 180 36
1 190 34
1 194 36
1 200 33
1 210 31
1 212 30
1 216 32
1 217 31
1 219 29
1 223 29
1 225 28
1 230 26
1 232 26
1 240 23
1 241 26
1 252 22
1 253 19
1 255 19
1 257 20
1 259 19
1 262 19
1 264 19

2 93 57
2 135 50
2 150 46
2 175 42
2 180 41
2 190 40
2 200 39
2 210 36
2 217 35
2 225 33
2 223 33
2 230 32
2 232 31
2 240 28
2 241 30
2 243 32
2 253 29
2 255 26
2 262 26

3 93 66
3 135 69
3 150 53
3 180 48
3 190 46
3 200 44
3 210 43
3 217 40
3 225 38
3 230 35
3 232 35
3 240 32
3 248 35
3 255 30
3 262 29

4 93 71
4 135 65
4 150 57
4 180 51
4 190 51
4 200 48
4 210 46
4 217 43
4 225 40
4 230 39
4 232 39
4 240 35
4 246 39
4 255 32
4 262 30

5 275 31

ZZ06

bearing clearances could affect it.

XDodgeMan

Headers can't change oil pressure.

Does the procharger use engine oil? If so it may use enough oil volumn to lower the total oil pressure...maybe.

My2000C5

I just changed out the pressure which, got finished putting everything back together started my 00 C5 witb 66k and now I'm getting low PSI its reading 0 what could this be from?

BigGun

Check the connector and wires. Sounds like a bad connection to the sensor.

Lsx Revival

I'd take the engine out by now . Mine went to 8 last year (look at current post of mine ....) I pulled the motor had two spun cam bearings motor only had 3k miles on it due to QMP handy work.

For the mileage it seems normal but you can always send out the oil for an oil analysis . I would IMO

Drewster67

I'm currently going down this road and I am waiting for my scheduled appointment with a race shop/engine builder.

Could be a few different items ...

1. Oil pump
2. Oil pump Gasket - O ring
3. Bearing clearance

From what I have been told - The Best thing to do is put a mechanical pressure gauge on it and see where its at and go from there.