BXX Posted November 18, 2009 Report Share Posted November 18, 2009 (edited) Figured I would do an actual write up on everything you will need and how to do it. This can be done easily in a day (assuming daylight). It took me about 10 hours as I spent quite a bit of time without daylight and using a flashlight. DISCLAIMER!!!! This swap was done on a 95 Cutlass Supreme. It should apply to all 95 models and 94 as well. Double check your wiring!! I am not responsible for you not checking wiring and frying something. REMEMBER, I DID THIS ON A 95. THERE IS A CHANCE 94 C100 WIRING MIGHT BE DIFFERENT FROM 95. Although the diagrams I had showed no difference. Items you need. Junkyard is your friend. I recommend getting all these items from the same car. 96 to 97 should all be the same, Not sure of 98-up parts -Complete Engine Harness from C100 firewall connector, 96-97 -Highjack Pin J2 (purple) from the interior side of the C100 with a length of wire from donor -OBD2 DLC with a length of wire -Complete Injector Harness, 96-97 -PCM with PCM box and air tubes, 96-97 -Upper Intake Manifold w/ EGR and EGR tube to Manifold, 96-97 -Upstream O2 Sensor, 96-97+ (has square connector) -Trans Selector Switch, 96-97 -Knock Sensor, 96-97 -3 wire coolant temp sensor, 96-up -Intake Tube w/MAF sensor, 96-up (airbox not needed, they are the same) -Downstream O2 sensor and harness -EVAP Vent Solenoir/Purge Solenoid assy, 96-97 Take into account, this allows you to tune, so I skipped the downstream O2, EVAP system assy and UIM and EGR. They are to be deleted. More hassle than they are worth. Modify the new harness like this. Pin K1, splice a short length here and add to L1. Make a good connection as this is a large gauge wire. Highjack a spare pin/wire length off your original harness after you remove it or snip some from a junkyard car when you are there. Move Pin E1 to A3 Pin J2 is the new Class 2 data wire. Add this to the vehicle side of the C100 and route it though to the interior. I did this, it takes a while to weasel the C100 out enough to add this wire without damaging it. Takes even longer to route it through. I went though the upper right of the C100 hole. Remove the airbag and glovebox so you can see it pop through. I used a thick 10ga wire to fish it though. I removed this pin and a length of wire from the Donor car to make life easy. Just plug it into the C100 and route it. Remove old DLC (datalink connector) and splice new OBD2 DLC in. Tan to tan, splice both grounds from OBD2 DLC to existing (worked fine for me). Purple wire goes to Class 2 data wire from J2 C100 that you already routed. Then add the last wire to 12v+ source, constant. I just spliced into the first one I found Remove these items, I tried to keep them in order of removal.. -Airbox, intake tube -Washer tank -Cross braces -Battery -Coolant overflow -PCM and tray -Unbolt C100 connector, T30 torx -Remove Altenator for clearance if you want -Unbolt P/S pump Now start removing connector and undoing the harness clips -Trans Selector Switch and Trans Main Connector -Cruise control -IAT should already be unplugged -O2 sensor connector -EGR -MAP -TPS -IAC -Coolant Temp Sensor (both 2 wire and single wire from rear of head, leave rear sensor in) -DIS module connections (2 wire for rear crank sensor can stay plugged in) -A/C Pressure switch near accumulator -Grounds at trans/engine bolts -Starter connections -Cooling Fans -Oil Pressure Switch -Knock Sensor -A/C compressor wiring -Front Crank sensor connector near A/C compressor -Cam sensor -Get underneath and unplug low oil switch connector and follow it to the speed sensor connector. Unclip harness near speed sensor and unplug speed sensor -On top, unplug 3 connectors that go to injector harness -Alternator connections if not already done so -EVAP Solenoid connector -DIS connector on this side if not already done so Now route the harness out. Passenger side fuse block and all. Everything should be unplugged at this point. Toss harness to the side. DONT THROW AWAY YET!!! Now remove the UIM. Pretty simple here. Now unplug the injector harness and set aside. Install new injector harness. Be careful of routing, should follow how the original was except now the cam sensor runs though this harness. Remove original 2 wire coolant temp sensor and install 3 wire. Plug in. Install UIM and TB. The P/S pump should be able to be bolted back in. If your changing to the new EGR system, install new EGR pipe and valve along with new UIM. Remove knock sensor and install new one. Remove Trans selector switch, install new one that the harness plugs directly into. 95 and earlier had a harness coming off of switch. Its easier to intall the new sensor than butcher your new harness up and wire to original Install new O2 sensor. Easier to do it now with no harness in your way. Still a pain in the ass though. If you are installing new EVAP assy, Do it now. You should have gotten the bracket and all. IMHO, this is a waste of time and money purchasing it. Install downstream O2 sensor and harness. You will need to weld on a bung after the convertor. Much like the EVAP assy, waste of time and money IMHO. Install new PCM box, bolts to holes already there. Route air tubes how they were on the donor car. Route new harness. It will take some adjustments to get it just right. Once I had it roughly routed, I started plugging things in starting by the battery and adjusting harness as needed to fit right. Continue this until everything is plugged in and harness is secure. Install PCM into box, plug PCM in (make sure you didnt lose the orange seals for the connectors) Snap on PCM box 'lid' Plug in C100 connector and tighten it down. Re-install alternator at this time if you removed it for clearance. Install new MAF and intake tube to the airbox. Install the coolant overflow (tight fit, should work fine) and make sure fuse block is secured down, install crossbrace On the inside of the vehicle, route the purple wire for the Class 2 data from the C100 firewall connector to the new OBD2 DLC as described above. At this point, all wiring should be complete Install battery, washer tank, and intake tube/air box. Install crossbrace Stand back, and make sure you plugged in everything. Odds are when you connected the battery, nothing went pop or smoked if you did everything right. Turn ignition on, start car. Should start right up. Make sure car turns off and everything works as it should!! If you got a scan tool, connect to DLC and make sure there is proper communication. If not, recheck wiring! Oh, and I have to give some credit to Brian P for a little help with the wiring. At first I had the car running but wouldnt shut off. I had a switched ignition wire on a constant. Brian P saved me another hour of looking over wiring diagrams. Then again, I only spent under an hour with just the 95 and 97 C100 pinout diagrams to get that far Edited April 22, 2017 by digitaloutsider Fixed formatting that got eaten from a prior forum conversion. Quote Link to comment Share on other sites More sharing options...
White93z34 Posted November 18, 2009 Report Share Posted November 18, 2009 now that is some good information! Quote Link to comment Share on other sites More sharing options...
BXX Posted November 18, 2009 Author Report Share Posted November 18, 2009 Once I clear my brain out a bit, I should prolly reorganize the post a bit. All in all, I spent $30 doing this swap Thanks to Ken getting me free parts. All I paid for was the harness, PCM, and PCM box ($28 and some change) And please sticky this or something within a few days once I make some final adjustments to the post and to to get a few pics Quote Link to comment Share on other sites More sharing options...
slick Posted November 18, 2009 Report Share Posted November 18, 2009 Once you have it all updated, and any discussion is done, I'll move it to the FAQ. Quote Link to comment Share on other sites More sharing options...
White93z34 Posted November 18, 2009 Report Share Posted November 18, 2009 how bout the "articles" section? Quote Link to comment Share on other sites More sharing options...
BXX Posted November 18, 2009 Author Report Share Posted November 18, 2009 Ok, thanks guys. I will try to have everything rearranged and done by tomorrow evening. Quote Link to comment Share on other sites More sharing options...
slick Posted November 18, 2009 Report Share Posted November 18, 2009 how bout the "articles" section? Yeah, that'd be best. Quote Link to comment Share on other sites More sharing options...
jake91 Posted November 18, 2009 Report Share Posted November 18, 2009 nice work this will be put to good use in a year or so Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted November 18, 2009 Report Share Posted November 18, 2009 nice work this will be put to good use in a year or so most of it would apply, but remember: this is a 3100 setup, not the 3.4... Quote Link to comment Share on other sites More sharing options...
jake91 Posted November 18, 2009 Report Share Posted November 18, 2009 oh DAMN! Quote Link to comment Share on other sites More sharing options...
BXX Posted November 18, 2009 Author Report Share Posted November 18, 2009 oh DAMN! Guess I shoulda pointed that out. Yes, most of it would apply as well, but if you wanna do this, you would need a 97 Lumina 3.4 PCM and harness which isnt easy to find. And im not sure of sensors that need changed. However Ken spoke with me about OBD2 swap in his 95 CS 3.4 Sedan and im up for it, he just needs to tell me when and where. That would be a different thread too if it happens Quote Link to comment Share on other sites More sharing options...
slick Posted November 18, 2009 Report Share Posted November 18, 2009 He has a 1994, so he should already have both cam sensors. There's probably only a few minor differences, but I've been out of the 3.4 world for so long, I forget. Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted November 18, 2009 Report Share Posted November 18, 2009 being a 94, he already has a MAF, but no MAP... Quote Link to comment Share on other sites More sharing options...
slick Posted November 18, 2009 Report Share Posted November 18, 2009 For now, lets keep this topic related to the 3100. Once it has all been completed, all unrelated information will be purged. Bob, you should updated the thread title. Quote Link to comment Share on other sites More sharing options...
BXX Posted November 18, 2009 Author Report Share Posted November 18, 2009 For now, lets keep this topic related to the 3100. Once it has all been completed, all unrelated information will be purged. Bob, you should updated the thread title. Will do!! Quote Link to comment Share on other sites More sharing options...
Crazy K Posted November 18, 2009 Report Share Posted November 18, 2009 actually, i was talking about it I had to stick a 3100 back in, but the same applies to the 94 3100 sedan too. We could also talk shop about a 3.4 DOHC conversion sometime... this swap WILL work in a 94 obd 1.5 car, excluding Luminas (both the obd 1 3.1mpfi and obd 1.5 3.4dohc)* now... there are 4 wiring differences between 94 and 95, which are wires present in a 95, but not a 94. 95 has two wires are for magnasteer. Magnasteer kicks ass (2.25 sport rack + plenty of low speed assist) but you need a 95+ ABS system to make it functional. so... don't worry about it. 95 has two wires are for the neutral safety switch, which is utilized through the passkey module 95+, while in 94- the actual THICK starter wire is interrupted by the NSS. If you use a 95/96/97 engine harness in a 94, you will bypass the neutral safety switch. *1994 Luminas: Are not equipped with passkey, and a bypassed passkey module must be added to make the car run, unless the PCM can be programmed to ignore not having passkey. There are also several other differences in the c100 connector, which I don;t have at hand to know. Quote Link to comment Share on other sites More sharing options...
BXX Posted November 18, 2009 Author Report Share Posted November 18, 2009 Ok, thanks Ken.. I remember about the Passkey when you talked to me about it.. So yeah, aside from the passkey system and magnasteer, 94 to OBD2 is straight forward.. Honestly, the passkey can prolly be ignored and use the NSS from the 96-97 so long as the PCM is reflashed to disable the passkey.. Quote Link to comment Share on other sites More sharing options...
Crazy K Posted November 18, 2009 Report Share Posted November 18, 2009 Ok, thanks Ken.. I remember about the Passkey when you talked to me about it.. So yeah, aside from the passkey system and magnasteer, 94 to OBD2 is straight forward.. Honestly, the passkey can prolly be ignored and use the NSS from the 96-97 so long as the PCM is reflashed to disable the passkey.. what? I think you misunderstood. It you obdII swap a 94 CS, Regal, or GP using your method, you will be bypassing the NSS starter disabler, as the NSS disables a circuit that goes to the passkey module, which will not be hooked up UNLESS you use a 95+ dash harness as part of the swap. Quote Link to comment Share on other sites More sharing options...
CSI_MuNkY Posted December 22, 2009 Report Share Posted December 22, 2009 That's a lot of Info! now my head hurts How much of this will hold true for me to do the swap (95 3.4DOHC)? Because I am still having my IGN SWCH1 maxi fuse blow I am considering doing an OBD 2 swap and a Big 3 upgrade in the spring. If that doesn't fix the problem I am just going to drive the car off a cliff and start anew. Jamie Quote Link to comment Share on other sites More sharing options...
slick Posted December 22, 2009 Report Share Posted December 22, 2009 Should be somewhat similar. I would send Ken a PM, he would know all of the minor details. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.