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Olds 403 oil pressure
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Topic: Olds 403 oil pressure (Read 6850 times)
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10YR TA
Jr. Member
Posts: 37
Olds 403 oil pressure
«
on:
April 24, 2010, 09:34:51 PM »
My 79' with the olds 403 has 120,000 miles on her. Runs great with no problems. While driving my oil pressure gauge sits between 20 - 40. At idle down near 20. Oil is full and newly changed. Does this sound normal? Anything would be helpful.Thanks.
New to this site and I have already learned alot.
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Trans am Oz
Sr. Member
Posts: 1183
Re: Olds 403 oil pressure
«
Reply #1 on:
April 26, 2010, 12:47:36 AM »
G'day 10YR TA
When we first got or 78 Olds powered TA we had oil pressure problems from the get go....when cruising along the road the psi would be around 30 then drop down into the red when at idle,so we got the bottom end rebuilt and now the oil pressure sits on or around 30 at idle and when cruising around the 60 mark.
Make sure you have the correct type of oil for that car... would be some thing i would check first
hope that helps
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10YR TA
Jr. Member
Posts: 37
Re: Olds 403 oil pressure
«
Reply #2 on:
April 26, 2010, 12:55:03 PM »
Do you reccomend a certain oil? What weight? Thanks
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ta78w72
Lifetime Member
Posts: 6297
Re: Olds 403 oil pressure
«
Reply #3 on:
April 26, 2010, 05:45:58 PM »
How did you validate the gauge accuracy?
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10YR TA
Jr. Member
Posts: 37
Re: Olds 403 oil pressure
«
Reply #4 on:
April 26, 2010, 07:10:29 PM »
I haven't done anything yet.
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Jolley_Man666
Adv. Member
Posts: 1738
Re: Olds 403 oil pressure
«
Reply #5 on:
April 26, 2010, 07:18:50 PM »
I would suggest 5w30. If that doesn't help it could be your oil pressure sending unit
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1979 Heritage Brown T/A- 455 Olds Rocket
dewcrazzy
Ohio Firebirds
Sr. Member
Posts: 1138
Bob
Re: Olds 403 oil pressure
«
Reply #6 on:
April 26, 2010, 08:04:14 PM »
my 403 read in the red while idling and then I went to the zone and hooked up an after market gauge and it read 45 while driving and around 25 at idle. I ran a post also and a few guys said that was about normal
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Maryland Bandit
Sr. Member
Posts: 722
Re: Olds 403 oil pressure
«
Reply #7 on:
April 26, 2010, 08:16:12 PM »
Bone stock 70,000 mile 403 here. When warmed up, idle oil pressures varies between 20-30 llbs. On the highway cruising, 45 lbs. Use 10w-40 oil and a can of STP oil additive, no problems.
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1999 30th Anniversary Trans Am # 592
1979 Y84 S/E - sold
Trans am Oz
Sr. Member
Posts: 1183
Re: Olds 403 oil pressure
«
Reply #8 on:
April 26, 2010, 08:16:27 PM »
we had a dead give away with ours..motor started knocking at idle
A good spin on it was that the timing chain needed replacing and the harmonic balancer was about to fall off
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RENOVATIONS
Administrator
Lifetime Member
Posts: 10623
Re: Olds 403 oil pressure
«
Reply #9 on:
April 26, 2010, 09:40:33 PM »
Quote from: Jolley_Man666 on April 26, 2010, 07:18:50 PM
I would suggest 5w30.
That's some pretty
thin
oil
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Jeff
Projects:
_____________
1978 Trans Am
1970 Camaro
1970 'Cuda
1987 Fiero GT
1982 Trans Am
1986 Corvette
Amtrak
Member
Posts: 461
Re: Olds 403 oil pressure
«
Reply #10 on:
May 06, 2010, 01:56:29 AM »
use 10w40 or 30wt oil
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Hitman's Pontiac Trans Am Forum
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Topic:
Olds 403 oil pressure