3400 in a buick century Help

[3400-95-Modified]

Question is has this been done... if so what sensors were used and what year motor is used. I have a 2000 3400 in my Beretta and I'm trying to get it to run off of a buick century ECM, but I'm getting a camshaft sensor error... should I be using the sensor from my original 95 beretta or should I be using the Buick sensor?

This is the only thing stoping me from doing this ECM swap.

[bszopi]

I'd say try using your 95 sensor. Since that ECM was only available 94-96, it will use the old style sensor.

[3400-95-Modified]

I hate to swap sensors, what a pita to get in there... but on that note, why does my 95 OBD1.5 ecm work with the 2000 sensor... thats what baffles me... I'll still go in that direction, I guess I'll try my year/car sensor first and then try the buick one last since they have different part no's

I would also hate to have to put one in that wont end up working with my 95 beretta ecm... i was hoping to make this plug and play but then agian if I swap it and everything works as it should I shouldnt need my old ecm anymore I'll just need a stock century chip to pass emissions, didn't really think of it that way...

hrmmm

what a pisser.

Thanks Brad

[bszopi]

You have the PN's handy? I can cross reference them with the PN's I have on file for the different cam trigger designs.

[3400-95-Modified]

I know my old cam trigger was a missing tooth setup, the 2000 one is a single tooth, not the new 03 style thats a lobe or something... So I'm not too sure... the PN for the buick sensor is SU1048 Wells part and I think mine is a SU198 Wells... and the 2000 GA i cant remember... the 2000 one is the one thats in there now. But from what I was told the cam trigger shouldn't matter because it works off of a leading edge and the leading edge is in the same spots on all of the cams, minus the 03 version I think.

[bszopi]

Hmm.. looks like you are out of luck. Just did a search through the AC Delco database and it seems that the PROM'd Buicks do in fact use a different CPS. Looks like I need to edit the cam page to reflect this new information.

Here are all the AC Delco PN's for your reference...

94-99 FLASH : 213-294
93-96 PROM : 213-245
00-02 FLASH : 213-937
03+ FLASH : 213-1533

[3400-95-Modified]

It's just the sensor??? Also I'm a little confused... I'm running a 2000+ flash sensor and its working on my 95 flash ECM...

If thats all then fine I'll change the damn thing, I was hoping it wouldn't be the cam itself.

I am like so fustrated right now and being middle of winter shitty weather and no garage to work in just isn't making this any easier... But like I said if its just the sensor I'll be all over that. I already have one.

Thanks for the info.

Also if its the sensor and I change it and the car begins to run normal on this ECM and doesn't throw any codes then I'll be happy and leave it in there. Then I just need to make it look pretty...

[3400-95-Modified]

Well the sensor swap didn't fix anything. I don’t know where to look for problems. Right now I have two issues with this ECM and I can't figure out why they are happening. One is the cam position sensor error I'm getting and I don't know if its because I'm running a 2001 camshaft with the single tooth design, where as the 95 is a missing tooth, but It still works on my stock ECM (go figure) The other issue is at WOT it leans out, the O2 voltage goes from .880 mv down to mere .040 mv... VERY BAD... Only thing I can see right now is as soon as the MAF rises above 18,000 KHz, I'm assuming, My scan tool is a Actron and it outputs a signal that is labeled as GR/Sec on the tool but the readings are in the thousands, so I'm assuming it's KHz, but as soon as it goes above that it will lean out, and I think its the injector Pulse width that is changing from around 18 down to 13, where my stock ECM runs at 20 at WOT... It’s like its missing power enrich mode or something or its just not going into it. This is why I would like to know if anyone has put a 3400 in a Buick century or olds ciera because that could explain my cam issue, if a 2001 3400 will run in one of those cars then I just have a wiring problem somewhere which is what I am hoping for right now.

Any input ideas is appreciated. And anyone with access to a 95 Buick with the 3100, a double check on the injector wire color to which cylinder will also help.

[bszopi]

Well, I thought that there might be another phantom cam out therewith yet a different trigger, but I compared the 95 Century, Beretta and Grand Am and they all have the same PN for the cam. So that idea is out the window. Have you looked at the wiring diagrams we have on the site for the Buick PCM? It might just be an issue with a GND wire not being right or something. I know when I was swapping in an OBD1 ECM into my car, we came across an issue with the TPS and how it was being seen by the ECM. Ended up, we didn't have it hooked up to the correct ground wire, so it acted screwy. That's where I'd start...

[3400-95-Modified]

Thats the diagram I have and I have checked and rechecked everything and I don't know whats missing, My brain is so fried right now and I feel like just dumping this project because I don't have the time to put into it... and I have already spent enough money on it. This really sucks

What I need is conformation that someone has a 2000 or 2001 3400 running in a century with no cam code, then I'll rip all my shit apart and do it all over again if I have to but I don't know anyone with that swap, so I'm not going ot beat myself up over it until I know it's runnable with that cam combo. All I know is both cam crank ECM and MAF were all triggered by the same Ignition source as of right now, and some of the grounds are also combined, maybe I need to split this all up... I don't know. If your bored and want to look at my pin matchup chart and beat it up, I can email you the xls file.

[bszopi]

Don't think I'll ever be bored (wife won't let me!), but if you want to send it over, I'll look over it some and see if I can see anything out of the ordinary.

bszopi@60degreev6.com

[bszopi]

Did some looking, and I think I might have found at least one of your problems...

I checked my 94 pin-outs (which should be the same as your 95), and here is the cam signal for it:



And now, if you look at the pin-outs for the Buick ECM, you see this:



The FLASH PCM is hooking the crank and cam low-reference into the PCM itself (pin C1. The PROM ECM is hooking it to chassis ground (on the transaxle stud). And in your spreadsheet, you are combining it with the MAP and IAT grounds (pin BA. I would try relocating the ground for your cam and crank to the engine itself and see if that makes a difference.

[3400-95-Modified]

I'm off to boston for today but when I get back thats what I was planning on trying, i was going to seperate my grounds better and see if I could get the power seperated better as well... I'm gonna try to get the maf and ECM powerd by a seperate ignition source rather than the one that powers the cam/crank sensor. I'll give it a whirl next week and hopefully something good comes from it.

thanks