74 454/High Engine Oil Pressure Question
Thread Starter
Instructor
Joined: Aug 2017
Posts: 130
Likes: 14
From: Fountain Hills, AZ
74 454/High Engine Oil Pressure Question
Hi All -
I'm trying to determine what the problem is with my 74/454. Reading oil pressure 0f 80 psi even after idle with engine warmed up. I'm trying to figure out the most likely cause. Also noticed a pretty good oil leak at the oil pan drain plug. I'm a newbie and trying to learn how so any advice on where to start would be much appreciated. Thank you!
I'm trying to determine what the problem is with my 74/454. Reading oil pressure 0f 80 psi even after idle with engine warmed up. I'm trying to figure out the most likely cause. Also noticed a pretty good oil leak at the oil pan drain plug. I'm a newbie and trying to learn how so any advice on where to start would be much appreciated. Thank you!
Race Director
Joined: May 2006
Posts: 18,756
Likes: 2,589
you need to temporarily connect a hand held gauge to determine if you really have that high a pressure reading. Based on that test you either have a problem with the oil pump or the in car gauge.
what viscosity oil are you using?
what viscosity oil are you using?
Drifting
Joined: Jun 2008
Posts: 1,565
Likes: 111
Hi All -
I'm trying to determine what the problem is with my 74/454. Reading oil pressure 0f 80 psi even after idle with engine warmed up. I'm trying to figure out the most likely cause. Also noticed a pretty good oil leak at the oil pan drain plug. I'm a newbie and trying to learn how so any advice on where to start would be much appreciated. Thank you!
I'm trying to determine what the problem is with my 74/454. Reading oil pressure 0f 80 psi even after idle with engine warmed up. I'm trying to figure out the most likely cause. Also noticed a pretty good oil leak at the oil pan drain plug. I'm a newbie and trying to learn how so any advice on where to start would be much appreciated. Thank you!
Thread Starter
Instructor
Joined: Aug 2017
Posts: 130
Likes: 14
From: Fountain Hills, AZ
Previously it was in the normal range - just went to start it up after sitting for a couple of weeks - pegged the gauge at 80 psi. After engine was at operating temp gauge still pegged at 80. When key is turned off gauge goes to zero
Drifting
Joined: Jun 2008
Posts: 1,565
Likes: 111
If it was fine a few weeks ago and then fully pegged the gauge when you recently started the car, it's likely the gauge sender.
Melting Slicks
Joined: Jan 2004
Posts: 3,247
Likes: 210
From: Detroit MI
Did you drive the car to get the oil fully warmed up? My LT-1 pegs the oil pressure at 70 psi cold, and stays there (through the warmup) until I really start working the oil, then it drops to 35 psi at idle. This is with 20W-50 VR-1.
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Thread Starter
Instructor
Joined: Aug 2017
Posts: 130
Likes: 14
From: Fountain Hills, AZ
No did not drive the car - just ran until engine was in normal temp operating range then shut it down when I noticed the high pressure (pegged at 80). I will run it like you suggested and see if it drops before replacing the pressure sending unit. Thanks again!