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| 3800sc Fuel Injectors Not Pulsing (Page 1/1) |
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86gt250whp3800s1
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OCT 27, 04:20 AM
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Working With 3800sc s1 and have spark but fuel injectors are not pulsing. I have 50psi koeo. I also have fuel in the lines pump working. I have replaced the Cam sensor no luck. rpm needle bouces when cranking. Need help. ------------------
86 GT 3800sc s1
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Dennis LaGrua
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OCT 29, 08:49 AM
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If the cam or crank sensor is not functional it will set a code and the injectors will not energize. Check for codes. With OBD 2 it's always a good idea to invest in a good diagnostic scan tool. ------------------
" 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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86gt250whp3800s1
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OCT 29, 08:57 AM
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So Its a 95 s1 so obd1.5 in the works of getting a scanner capable. And I have already changed the cam sensor. Wasn't sure if I should the crank sensor bc it has really good spark?
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olejoedad
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OCT 29, 09:00 AM
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Do you have 12v on the pink wires at each injector with KEY ON?
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86gt250whp3800s1
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OCT 29, 09:06 AM
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I know i had 11v but do belive battery was low jumped it and I do think I seen 12
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86gt250whp3800s1
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OCT 29, 09:10 AM
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Yes I do in fact have 12v at injectors
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Dennis LaGrua
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OCT 29, 09:12 AM
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| quote | Originally posted by 86gt250whp3800s1:
So Its a 95 s1 so obd1.5 in the works of getting a scanner capable. And I have already changed the cam sensor. Wasn't sure if I should the crank sensor bc it has really good spark? |
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OBD 1.5 makes a big difference. You can still read code but only a full featured scan tool like AutoXray, Actron, Bosch or Snap on will provide live data. We use an Actron III scanner here but all of the OBD 1/ODB1.5 stuff is now considered obsolete and hard to find used. As Joe has alluded to the VOM is your diagnostic test aid. ------------------
" 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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86gt250whp3800s1
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OCT 29, 09:17 AM
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jelly2m8
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OCT 29, 01:58 PM
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Been awhile since I did a series II OBD1 swap, get the wiring diagrams for your ECM and make sure you have all the necessary powers and grounds ran to it. Ran into a similar issue way back when SII swaps started becoming a thing, which is similar to your S1 swap. [This message has been edited by jelly2m8 (edited 10-29-2025).]
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Dennis LaGrua
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OCT 29, 02:24 PM
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| quote | Originally posted by 86gt250whp3800s1:
What does that men? |
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It means using a volts/ohm meter to check for 12V power where it needs to be, ignition on and off.
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" 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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