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| Oil pressure sensor wiring on 3800 SC (Page 2/2) |
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MulletproofMonk
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APR 26, 08:38 PM
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| quote | Originally posted by olejoedad:
The backup fuel pump power circuit is not wired per you info, Brian.
Pin A does indeed go to C203 E for the gage.
C and D go to C203 B and L. |
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Well, that is interesting, because that is what i have on my sheet... i did a strike on it to not spread the wrong information...
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olejoedad
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APR 27, 08:10 AM
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TurboGN
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APR 27, 09:06 AM
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Thanks for all the great information guys.
I pulled the oil pressure gauge and followed the Tan wire which ends at the C203 as a Whiteish wire (maybe color change due to age?) that is in the "C" pin with no wire on the opposite side. I spliced into that wire but still had a pegged gauge. I switched to a 1988 oil pressure sensor and it now works. I seem to think that I am going to be running into this kind of stuff on the last two items, A/C & Cruise control.
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olejoedad
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APR 27, 11:40 AM
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| quote | Originally posted by TurboGN:
Thanks for all the great information guys.
I pulled the oil pressure gauge and followed the Tan wire which ends at the C203 as a Whiteish wire (maybe color change due to age?) that is in the "C" pin with no wire on the opposite side. I spliced into that wire but still had a pegged gauge. I switched to a 1988 oil pressure sensor and it now works. I seem to think that I am going to be running into this kind of stuff on the last two items, A/C & Cruise control. |
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The 'C' pin on the C203 is for the malfunction indicator light in the instrument cluster.
The 'C' pin on an 88 OPS is for the fuel pump relay backup circuit.
The 'A' pin on the 88 OPS should be attached to C203 on the 'E' terminal.
Are you sure your posting doesn't have a typo error in it?
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TurboGN
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APR 27, 09:25 PM
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| quote | Originally posted by olejoedad:
The 'C' pin on the C203 is for the malfunction indicator light in the instrument cluster.
The 'C' pin on an 88 OPS is for the fuel pump relay backup circuit.
The 'A' pin on the 88 OPS should be attached to C203 on the 'E' terminal.
Are you sure your posting doesn't have a typo error in it? |
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You're right, it should be "D" not "C", and there was no wire coming out.
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Trinten
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JUN 03, 11:52 PM
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| quote | Originally posted by TurboGN:
Thanks for all the great information guys.
I pulled the oil pressure gauge and followed the Tan wire which ends at the C203 as a Whiteish wire (maybe color change due to age?) that is in the "C" pin with no wire on the opposite side. I spliced into that wire but still had a pegged gauge. I switched to a 1988 oil pressure sensor and it now works. I seem to think that I am going to be running into this kind of stuff on the last two items, A/C & Cruise control. |
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A friend is running into this same problem with his 3800 swap. His swap was done into an 86 GT. He is having the same issue you are (oil pressure gauge pegs as soon as the car starts up). He confirmed the pressure sender is going to the tan wire.
The oil pressure sensor he installed is for a Fiero. AC Delco part C8020, GM part # 19106700. Which looks like it's for the 87. Besides the connector being different on the one for the 88 (looks like GM part number D1808A?) did you have any other issues with switching to this connector?
Thanks
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jelly2m8
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JUN 04, 01:07 AM
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Deleted, question was answered. [This message has been edited by jelly2m8 (edited 06-04-2025).]
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Dennis LaGrua
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JUN 10, 05:23 PM
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After reading all this, I'll check my harness connections again. My oil pressure gauge always read toward max but I recall leaving the oil pressure sensor connection attached on the 2003 GTP harness and just wiring it in. Time to recheck. ------------------
" 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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Jncomutt
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JUN 11, 08:22 AM
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| quote | Originally posted by Trinten:
The oil pressure sensor he installed is for a Fiero. AC Delco part C8020,
Thanks |
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C8020 appears to be a switch, not a sending unit for a guage. That one closes at 9 PSI. Near zero ohms (which is same as shorted like he has) pegs the guage, makes sense he sees that. High resistance (90-100ohm) would put the guage around zero and cause light to come on.
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Dennis LaGrua
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JUN 12, 09:28 PM
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The problem here and it shows on my 3800SC as well may not be the wiring but the sensor itself. Most of the OPS units on Rock Auto show a 2 pin pressure light switch. Although the wiring may be correct you may not have the correct oil pressure sensor but one that just triggers the idiot light.. I am running a 2003 PCM and harness with all the original connections including the power center. Does anyone know the correct sensor part number that will drive the Fiero gauge correctly??? Even the 88 2.8 L OPS have come through wrong. ------------------
" 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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