I'm interested on changing my 93Z computer to the 94 style. Does anyone have any details on how to do this or know of anyone who has done it? How much work?

The computer chip is driving me crazy, I have to buck up for a $350 chip every time I want to change my underpaints.

I can edit out and still not have a Mass Air Flow, but I need bigger injectors, diff. gear ratio adjustment, will be needing a diff. cam in the future, and I'm sure it will change.

If anyone can shed some like on the subject, I would greatly appreciate it.

 

First off, who the heck is charging you $350 for a chip?? Pay the $150 that any number of tuners for 93's charges and get a custom one that only needs reflashing. PcmForLess, Madwolf, Fastchip are three that I can think of (PCMFORLESS most highly recommended).

It IS possible to swap to a 94 computer system in a 93, but it's troublesome. There's wiring harness additions needed and there's several pinouts on the ECM which need to be changed. The wiring harness additions need to be the MAF (obviously), the heated O2's, the IAC connection is different I believe, and I think there's one or two more.

Why exactly do you want to swap?? Is it because you want to tune it yourself or other??

 

Why don't you check out us.. We have an outstanding reputation with the 93 cars and we are very affordable. WE are also doing dyno days across the country this year.


www.pcmforless.com

 

Well, long story short, my car sat for a while RIGHT after my original heads/cam/intake...yada yada, setup and had the company do my chip, but it hads been some time and my expectations have changed. I just feel so restricted with the chip, I didn't know though it could be done for less than half that. I want: bigger injectors, I have diff. gears, my future mods (could be very soon mods) are to upgrade my heads, and a much bigger cam. I just wasn't looking forward to another $350 to adjust for it.

I was considering the 94 and tuning out the MAF so I could program myself, I have a few good home tuners as friends to help w/ that.

Well, that doesn't sound to bad, when are you guys making your rounds around the US for dyno tuning, and how much will dyno tunes be? You can PM or email me. Or just shoot me your name, I'll call you guys up.

thanks

 

My name is Alvin, I do alot of dyno tuning here in NC, we also will be in OH, PA, and KS (maybe) in the next few months as it is now.

Our buisness name is pcmforless.com We sponser this site also.

 

Alvin,

Isn't there also a speedo issue between the 93's and 94's??

Steve

 

just buy a pocket programmer and tuner cat, that is what i use, it works great

 

You will also need to change out the wiring to the injectors. Your batch fire 93 harness has a single wire to fire each bank, the 94 sequential fire injectors require an individual wire from the PCM to each injector.

 

It is considerably more involved than that... First you will need a harness, then a PCM and then you will need to get heated o2 sensors. (if a conversion to them hasn't been done already)

Next, the IAC valve will not plug to the 94 harness. You will either have to swap the bottom plate of the throttle body with a 94 one (including the 94 valve) or swap the connector from the 93 harness over to the 94 harness.

The tach will be off after this conversion. Everything else will be fine. You can use a 94-96 cluster or you can just swap out the tach part from a 94-96 cluster in your current cluster.

The reason for the tach being off is because 93s have a little module in the harness right by the coil. If you can swap that module over to the 94 harness, the tach might work, but I haven't tried it.

Finally, the engine harness to interior harness connectors will connect just fine, however, the wires are not in the same locations, so it will not work. You will need to swap the wires to match the 93 interior harness locations. A diagram of a 94 and 93 harnesses can be found on shoebox's website - www.shbox.com to aid the process.

Of course, you will need to program the PCM for the 22# injectors and no MAF as well as a couple of other things if you're doing this on a car with stock injectors and don't plan to run a MAF sensor.

The above applies to M6 cars only. Automatics will need a bit more work (both wiring and programming) to make the 94 PCM control the lock up and release of the 700R4 converter.

Having said that, I would trust Alvin on a chip instead of going through this mess, unless you love pain in the *** type challenges..

 

Ditto on that PITA

Steve

 

Have done this personally, just buy the 94 PCM and the 94 Wiring harness for your application, if its a 93 auto you'll have to build a stand alone lock-up for the 93 Tranny.

The 93 and 94 are almost identical creatures EXCEPT for the trannies and engine harness and PCM.

The speedo is easy enough , either you can change to a 4L60 E or if you have a 93 4L60 you change the tailhousing, speedo pick-up , and the reluctor on the tailshaft. Tunercat or LT1 edit will allow you to bring the speedo in line then.

I have also done the oposite out of neccessity, we put a 93 drivetrain, computer and engine harness into a 94.

The engine harness it complete plug into either, the plugs are the same under the dash and under the compartment to the car (from the engine harness).

 

HUH!? Now I don't know what to think....
I'm in the process RIGHT NOW of converting my 93 to a 94 setup.
I've done everything Madwolf mentioned. I swapped the IAC connector, Swapped the clusters, swapped the 2 wires under the dash (Fuel pump power and Serial Data)

Now my car fires up, but dies after 2-3 secs and even faster if I give it gas. Car has spark, and fuel pressure.

One thing I was wondering, do I need the 94 EBCM? I was looking at wiring schematics and the serial data line for 94 cars run straight into the EBCM. It looks the same as 93s, but didn't know if 94 EBCMs are different? There is also something else, take a look at THIS SCHEMATIC

When FLASHING the pcm, for some unusual reason I get constant "CLICKING" from the CCP module on the passenger side of the intake...Seems to me some wiring is still needed. One more thing I noticed is that there is one wire different on 94 cars, If you look at the 10 pin connector on the passenger side strut tower, PIN D on the 94s is Blue and Tan on the 93s... Schematics state that the D Pin on 94s are for serial data, but WHY?????

SOMEONE PLEASE HELP! I need to get this done by track opening day on Saturday!!!!!

Oh yeah WS Sick, you MUST swap 2 wires under the passenger side dash. Otherwise your fuel pump won't power up.

 

We completely plugged the 93 Harness into the 94 car without cutting a wire, and vise versa. As mentioned the O2s and IAC are differnet between the two years, but the rest if you have the complete underhood harness it pretty well straight forward, if you have the original key from the car and the Vats system from the original car wether it be 93 or 94 it will plug and go. Actually doing it again on another salvage car as we speak (putting a 93 engine harness into a 94 car).

Now flashing a computer may be completely different, but I flashed the 94 computer by instaling it into my 97 and flashing it there since I only have that type of cable, I then put the computer back into the other car.

 

Ok my car is running. Madwolf was right. There are a few wires you have to swap around. 2 to be exact.

Car runs great.

 

Those two wires are on the ALDL connector right? or where are they ?