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J.E. Rowlett
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MAY 31, 10:30 PM
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Hey folks, 85 gt 4speed, does the ecm monitor oil pressure? Oil pressure gauge is vibrating, doesn't fluctuate? Thanks
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theogre
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MAY 31, 11:10 PM
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No.
Gauge, sender or other things can make problems.
Get a real gauge to temp replace the sender to see real oil pressure in the engine then try to fix the gauge problem(s).------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave
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J.E. Rowlett
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JUN 01, 09:35 AM
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Dennis LaGrua
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JUN 01, 09:53 AM
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On a 35 year old Fiero it is common that the oil pressure sender and the gauge could be inaccurate. I would replace the gauge and sensor with known good ones (to keep the stock look) and as suggested use a quality aftermarket gauge to verify the reading. You should not expect exact OEM oil pressures on an old worn high mileage engine. ------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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olejoedad
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JUN 01, 12:05 PM
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Forum member JGunsett repairs and calibrates Fiero gages and is very reasonable.
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olejoedad
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JUN 01, 12:08 PM
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Age and mileage don't necessarily mean low oil pressure.
Maintenance and frequency dictate engine wear.
My 275k Blazer runs and carries oil pressure like it is new.
My 86 SE showed no engine wear at 165k.
Both were well maintained.
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theogre
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JUN 01, 01:05 PM
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| quote | Originally posted by olejoedad:
Forum member JGunsett repairs and calibrates Fiero gages and is very reasonable. |
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New Tach Board won't solve OP Gauge problems.
New/"recert" gauge often won't solve this either. Plus is GT often means Gauge Pod/Cluster over Heat/AC etc. where OP gauge is.
Because OP Fuel and Temp gauge work same way and often "lie" for iffy ground(s) or power or wiring on top of "bad" sender or gauge.
Is Why your first step is use a real mech gauge to read OP at engine.
Next is use resistor(s) to emulate the sender. 0Ω = "0," 45Ω "Half scale" and 90Ω "Full Scale" for OP and Fuel. If use fix resistor just get close to that Ω. Can test at engine end then at back of dash or gauge pod w/o pulling a lot of stuff apart. RD has a resistor "tool" for people don't want to find resistors. See my Cave, Oil Sensor for what wire at sender to ground via the resistor.
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J.E. Rowlett
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JUN 01, 02:48 PM
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Great information as usual! Thanks Guru"s!
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olejoedad
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JUN 01, 07:24 PM
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. [This message has been edited by olejoedad (edited 06-01-2022).]
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