Oil pressure problems.............can someone help?
Thread Starter
Racer
Joined: Oct 2000
Posts: 456
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Oil pressure problems.............can someone help?
This is on my '94 LT1. Keep in mind that this only happens after the car has warmed up. While sitting and idling there are no problems. While driving at a sustained speed, there are no problems. However, as I am coming to a stop and push in the clutch, apply the brakes, and the rpms drop, then the oil pressure will drop to the normal 25-30 psi, but just as I am almost to a complete stop the pressure will continue to drop to zero and the "Check Gauges" light will come on. I can then rev the motor and everything is back to normal. Oddly enough, it doesn't do it everytime either. The oil pressure sending switch was leaking, but I replaced it and it didn't help. Could my oil pump be going? Is there anything else that could contribute to this? There are no rods knocking or any valve clatter. I am going to hook up another oil pressure gauge over the weekend to rule out some possibilities. Any ideas? Has anyone else experienced this before? Any help, as always, is greatly appreciated.
:cheers:
:cheers:
Race Director
Joined: Aug 2002
Posts: 13,356
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From: tucson AZ
St. Jude Donor '04 & '05
Re: Oil pressure problems.............can someone help? (Dr. Doom)
I'm almost sure it is a problem with the monitoring sys.
Mine is over 30 psi after warm up.....Your car would shut down if you had a real oil pressure problem...just my thoughts....
Check all conections..... :eek:
Mine is over 30 psi after warm up.....Your car would shut down if you had a real oil pressure problem...just my thoughts....
Check all conections..... :eek:
Racer
Joined: Aug 2002
Posts: 259
Likes: 0
From: Chicago Suburb Illinois
Re: Oil pressure problems.............can someone help? (Dr. Doom)
I never had this happen to me but to be sure you could hook up a mechanical oil pressure gage to check pressures. good luck.....
Team Owner
Joined: Sep 2001
Posts: 62,146
Likes: 1,730
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: Oil pressure problems.............can someone help? (Dr. Doom)
45-60psi at cruise and half of that at idle is normal, if you already replaced the switch, replace the pump
If it goes out on you, you could be buying a new motor, better be safe than sorry.
If it goes out on you, you could be buying a new motor, better be safe than sorry.
Melting Slicks
Joined: Apr 2001
Posts: 2,105
Likes: 220
From: Ca.
Re: Oil pressure problems.............can someone help? (oldace84)
I'm almost sure it is a problem with the monitoring sys.
Mine is over 30 psi after warm up.....Your car would shut down if you had a real oil pressure problem...just my thoughts....
Check all conections..... :eek:
Mine is over 30 psi after warm up.....Your car would shut down if you had a real oil pressure problem...just my thoughts....
Check all conections..... :eek:
Burning Brakes
Joined: Feb 2000
Posts: 824
Likes: 2
From: Camden SC
Re: Oil pressure problems.............can someone help? (drive it)
Hmm, check gauges light is around 4 or 5 pounds, pretty low.
I'm with the verify group. Get another analog gauge, install, go test drive. I would make sure the pressure is not dropping that low. Should this be the case, something is not right.
With regards to the fuel pressure drop and loss of fuel to the injectors, I would consult the service manual and the schematics for a Code 54. The service manual for my 90, Code 54, shows the electrical power from the oil pressure switch to the fuel pump being in parallel with the fuel pump relay. This feature may be different on other years but don't think so. If the fuel pump relay fails, then the 4 or 5 psi oil pressure switch will power the fuel pump, hence the redundant power feature. It is not in series with the fuel pump relay, at least on the 90.
I'm with the verify group. Get another analog gauge, install, go test drive. I would make sure the pressure is not dropping that low. Should this be the case, something is not right.
With regards to the fuel pressure drop and loss of fuel to the injectors, I would consult the service manual and the schematics for a Code 54. The service manual for my 90, Code 54, shows the electrical power from the oil pressure switch to the fuel pump being in parallel with the fuel pump relay. This feature may be different on other years but don't think so. If the fuel pump relay fails, then the 4 or 5 psi oil pressure switch will power the fuel pump, hence the redundant power feature. It is not in series with the fuel pump relay, at least on the 90.
