86TpiTransAm

My friend asked me to post this for him! He has an '89 Formula awhile back he put a rebuilt 355 in it! When he built the engine he bought a brand new oil pump for it and also hooked up a different oil pressure guage!! He's had decent oil pressure up until now! Now he says it won't hold above 25PSI...ever!! The Pump is probably only about 6 months old or so I would say and the engine was rebuilt about the same time!! He's checked his oil level and says they're fine! He changes the oil regularly! What could possibly be causing this crappy oil pressure???

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1986 Trans AM
305 TPI
4 Wheel Discs
9 bolt Borg Warner Rear
Completely Stock
Soon to upgrade to a 383 stroker w/TPI, pocket ported 64CC heads, ported intake, comp cam, TPI air foil, Adjustable Fuel Pressure Regulator, possibly bigger injectors!
Current project: Keeping my car running until I get the money for the above mentioned project! :-)

Vader

86,

Lots of possibilities, from a bearing failure to a slipped pickup tube. If the oil pressure is truly low (don't believe the dash gauge - verify with another gauge) you'll probably be pulling the oil pan to find the problem.

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Later,
Vader
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"I'm gonna talk about some freaky sheet now..."
Adobe Acrobat Reader 4.0
KaleCo Auto Parts

burnoutrpm

actually im the one my friend was talking for (iwas at work!) anyhow i've used 2 (new) guages. and niether one of them reads any different! it starts out around 65 psi but drastically drops over the time you drive it! till it reaches 25 or 20 psi i know it could be the rods or mains(bearings) and the damn pickups on sbchevys tend to fall off all the time! but i trully dont know how to test anything on this subject? any help immediatly would be great its a daily driver! please help email me anytime!!

burnoutrpm@hotmail.com

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1989 firebird formula

Mods: converted from T.B.I. to a carburator 305 to a 350. Flowmater exhaust,hedman shortie hedders,202 heads,350 horse cam,bored.40 over, Edlebrock torker2 intake.

Future mods performer rpm air gap intake (polished) and 600 edlebrock carb, comp roller cam, and way better headsa 400 defintely in the works!

RB83L69

That sounds depressingly like a bearing. Thanks for sharing it with us. Probably a main, since a rod would be knocking. I believe he needs (ahem, you need) to put a crank kit in it before it blows up and trashes the block or something else, rather than waiting until after. The pump is probably OK, I have never in all my days seen one that does that, they either work or they don't, no halfway only when cold.

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"So many Mustangs, so little time..."
ICON Motorsports

[This message has been edited by RB83L69 (edited January 22, 2001).]

8Mike9

Try a new sending unit first.