I've got a '90 Formula with H.O. 305 TBI. The oil pressure seems to be running pretty high. At idle the pressure is about 46-48 and at 2000 RPM it's anywhere from 53 or 54 to pegged (60 PSI). The oil is fresh as well as the filter. What kind of oil pressure do you guys run? Also, my motor tends to run cold. Usually around 170 and never over 190. Is this standard for third gens? I have a suspicion that the gauge could be a little off because the motor seems to be running very strong. I've never seen smoke out the tail pipe and it's always running great. Any advice you guys can give would be great. Thanks.

 

there is no h.o. tbi 305. the oil pressure your seeing is normal and just fine. as for the temp, it may have an aftermarket chip and lower temp thermostat in it. this is just fine. better in fact.

 

I have the Chilton's and it's says on a table that the operating pressure for our cars should be 55psi@2000 rpm...hope this helps..your pressure sounds normal. Have you put on thicker oil at the last oil change, that could be it. Hope this helps.

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88 IROC-Z,L98 350 TPI, 700R-4 Tranny 2.77, K&N Filters, 126K Miles runs great. http://www.j-body.org/library/humor-...arearicer.html

 

If your oil pressure gauge is pegged often, you probably need a new oil pressure sending unit. Its located just above the oil filter, it looks like a film canister with a wire sticking out of it.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

on my 86 305 carbed LG4, my pressure is usually at 30psi. sometimes a little higher when I start it in the morning or when it's cold. Just tonight it went down to about 20 psi after I got off the highway. I was in 4th @ almost 5000 rpms for about 20 seconds, got off the highway and stopped at a light and my pressure was lower than 30psi. It rarely gets lower than 30psi. I thought maybe I sprung an oil leak running the engine so hard, but no oil was coming out and there was no burning oil odor.

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Zepher
'86 Pontiac Trans Am WS6, 5 Speed:
Edelbrock 1406 Carb, Edelbrock Performer RPM 7101 Intake Manifold.
Edelbrock Open Element Air Cleaner: Flowmaster Exhaust, 160* Thermostat,
Grant GT Steering Wheel, MSD HEI Coil, Taylor 8mm Wires, Recaro Seats,
Alpine CD+Changer,Rockford & Soundstream Amps, Premier TS-1040C Subs, Polk Audio highs/mids.

86 Trans Am & Girls

 

My 90 Formula pegs at 60 psi when its cold (always has), at idle warm its around 45. Temp could also be a stuck thermostat. Mine was like that for a couple years til I replaced it.

 

cripes... my lg4 runs 60 almost all the time, and when it has been runnin for a while, then it runs about 40 at idle.... and it is right on, i checked it with a mechnical gauge.

Steve

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86 Firebird, LG4, t-tops, 2.73 open rear, SLP 3 inch cat back exhaust, catco cat, Coming mods: GOT A 350 IN THE WORKS BABY! gonna throw my TES edlebrock headers on it, and hopefully get some more gear and the cowl hood on

My Webpage- Battle of the birds, My own Thirdgen Page, still under construction, http://www.geocities.com/soares711/index.htm

88 Firebird Formula- deseased 2/9/99- 305 TPI, SLP 3 inch exhaust, SLP Intake runners, SLP cam, 3.45 BW disc brake posi, WS6, NOS, and all that good stuff, 13.8 on the motor, 12.89 on NOS and slicks! Hit by what else!?!? a FORD EXPLORER!!!!!!