1999ssls1

iTrader: (71)

I put another cam in my car last night and cranked and oil pressure read at 70 psi. I warmed it up and drove it and come back and it read about 30 psi at idle. It usually reads 40 psi at idle. Today I cranked it and reads 0. Any help appreciated. Im thinking oil pump. Give thoughts and opinions please.
Thanks

1999ssls1

iTrader: (71)

anyone?

99blancoSS

iTrader: (115)

How many miles on engine. What cam was in there before and what cam did you switch to? Stock oil pump?

1999ssls1

iTrader: (71)

700 miles on engine. Stock oil pump from ls1 with 94k. I had the gm asa cam.

1999ssls1

iTrader: (71)

any thoughts out there?

bigturboz28

From what i've read the things to check are:

oil pressure sender unit
oil pump
oil pump pickup tube o-ring (if you did a re&re on this)

PunkNPonys

iTrader: (2)

I would replace that old pump with a LS6 pump and if that still doesnt correct your problem then i would replace the oil sending unit like stated above. Goodluck keep us updated.

ArcticZ28

iTrader: (14)

Have someone wiggle the sending unit just to make sure it's not that. I'd get back in there and check out the o-ring to see if it was pinched. You didn't reuse it did you? It's always a good idea to replace it for simple and cheap insurance.

1999ssls1

iTrader: (71)

I did not have the pump off this time. So its not the o ring. The oil sending unit was replaced when I put the 6.0 in. It just done all this overnight. It is reading absolutely 0 oil pressure. I cranked and was running fine and then I seen the oil pressure and cut it off.

trans_am_31

iTrader: (51)

HI, as stated above check the oil pressure sending switch. My friends car had a defective one. He would run the car but the gauge always read zero (please dont do that). Also check the pickup o-ring make sure it isnt pinched or just plain worn, it happens. Last but not least check your oil pump, replace it with an LS6. Good luck keep us posted.

1999ssls1

iTrader: (71)

The gauge moves when you turn the car on but does not read anything.

1999ssls1

iTrader: (71)

Would either go bad overnight?

trans_am_31

iTrader: (51)

Yes they are known to do that. Try swapping the sending unit with a friends unit that works and you can eliminate that possibilty if it works.

1999ssls1

iTrader: (71)

check gages light is on also

trans_am_31

iTrader: (51)

Yes the check gauges light will come on because your oil pressure is at zero, so its alerting you of it.

1999ssls1

iTrader: (71)

I just hate tearing it back apart after putting it together after just last night. Its a stock oil pump with 94k out of a 99.

bczee

iTrader: (12)

You may have nicked the cam bearings and it could be some of the reason you have low or zero presure.. also the relief valve sprint may have gone bad in the pump?

and the usual.. the o-ring, did you remove the oil pump ?

1999ssls1

iTrader: (71)

I did not remove the pump. As far as the cam bearings it shouldnt of had any oil pressure from the get go. Right?

1999ssls1

iTrader: (71)

It was the oil pump.

brad8266

iTrader: (23)

That sucks that it broke right after you did the cam swap. At least you got it done.