low oil pressure
Thread Starter
Junior Member
Joined: Jun 2009
Posts: 51
Likes: 0
From: Idaho Falls ID
Car: 84 Camaro z28
Engine: 305. LE9
Transmission: 700-R4
Axle/Gears: 3.42:1 Locking
low oil pressure
hey I got a quick question I just got my car back from getting the flex plate done and now when ever I'm driving and i hit the brakes to stop the oil pressure drops to the point that the car shuts off. I was just wondering Why and input will help thanks in advance.
Senior Member
Joined: Mar 2009
Posts: 503
Likes: 1
From: Des Moines, IA
Car: 90 Formula WS6, 86 Sport Coupe
Engine: 305 TBI, 2.8 MPFI
Transmission: 700r4, 700r4w/vette servos
Axle/Gears: 2.73 Open, 3.42 Open
Re: low oil pressure
Are you sure the stalls/shuts off from low oil pressure? You could have a small vacuum leak that only becomes a problem when your using the power brake booster. My buddy had the same problem in his Fiero. If it isn't that I'd still think it would be somewhere along the lines of vacuum.
Hope this helps somewhat.
Alex
Hope this helps somewhat.
Alex
Thread Starter
Junior Member
Joined: Jun 2009
Posts: 51
Likes: 0
From: Idaho Falls ID
Car: 84 Camaro z28
Engine: 305. LE9
Transmission: 700-R4
Axle/Gears: 3.42:1 Locking
Re: low oil pressure
i don't think it is a vacuum because I've redone the hoses recently, but I'm more trying to figure out why I have such a low oil pressure.
Senior Member
Joined: Mar 2009
Posts: 503
Likes: 1
From: Des Moines, IA
Car: 90 Formula WS6, 86 Sport Coupe
Engine: 305 TBI, 2.8 MPFI
Transmission: 700r4, 700r4w/vette servos
Axle/Gears: 2.73 Open, 3.42 Open
Re: low oil pressure
Well, then I'd say your oil pump is worn out, or the oil pressure sensor is bad and giving a false reading/lying to the ecm. Can you hear the valves making noise?
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Supreme Member
Joined: Mar 2008
Posts: 1,549
Likes: 1
From: CT
Car: 86 T/A, 83 Z/28
Engine: 5.0 TPI, 350 2 X 4 bbl
Transmission: 4 speed auto, 5 speed manual
Axle/Gears: 3.23 posi, 3.73 std
Re: low oil pressure
For starters i would check to make sure your oil pressure reading is correct by checking it with a mechanical gauge. If it turns out you truly do have low pressure thats not the cause of say a plugged filter, low oil level, or something to that extent your motor is trashed or i should say in need of a rebuild at least.
Senior Member
iTrader: (1)
Joined: Feb 2009
Posts: 972
Likes: 2
From: La Grange Park, IL
Car: 1987 Iroc Z28/ 1982 Z28
Engine: 355 TPI IP/ 305 CFI
Transmission: T-56/ 300C
Axle/Gears: 3.42 Open/ 3.73 Posi
Re: low oil pressure
you have a vacuum leak, contrary to the seamed popular belief around here, the oil pressure sensor for the fuel pump will NOT shut your vehicle down in a no oil pressure situatin, it is a nothing more than a bypass for the fuel pump relay. when you push your brakes, your brake booster exhausts your vacuum and the engine dies and your oil pressure subsequently drops to 0, what i would do to start is plug the line for the brake booster and drive around on standard brakes, the bladder in the booster probably ruptured. if she doesnt die, then you have a vac leak, most likely in the booster, if your booster ruptured i'dd pull your master cylinder away from it cuz that USUALLY is caused by brake fluid leaking past and into the booster
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