oi mate, you've got me mis understood. I can buy a pre-made e[e]prom programmer for $200-$250. But I am going to make one. So far I am still way under budget, but I havn't gotton to the dip sockets or voltage regulator yet. This thing is going to be barebones my friend.. I will probably just have the e[e]prom soldered in, instead of a plug for it, just so save money. The other thing I am looking at, is are there different sized eproms? Because I think the biggest thing I am looking at here is to fix my compass display [because I am going to solve whatever the problem is, I am determined to]. And I also want to be able to read OBDI, OBDI.5, and OBDII eproms, but mainly the OBDI'* since that'* for my car. I have yet to see an ECU eprom yet, but I know the size and appearance of the eprom [if you could even call it that] in my compass display. So to simplify it, are all eproms that I listed above the same size? or do they vary, and a different reader/writer needs to be fabbed up for them all?


-justin

err, I believe they're all the same. Uhm..you're kinda scaring me though. How about you practice on a few before my Jet goes in? haha

What is wrong with your compas display?

haha, yeah I'll be practicing, when I purchase the sucker, I will try to get a ECU from the local yard for any car, which ever is $10 .. yeah, right, like that 'll happen. And try to read the data from it.. if sucessful, then I will purchase up some eproms for an online store [where I just so happened to find the schematics]. And practice with that.

As far as the compass goes, I will direct you to this thread. It should explain everything. I must say though, we all know the problems with the 87-91 I/P'*, and I am determined to find a better idea than replacing them, because as I found out, that may not always solve the problem.


-justin

I may not fully understand all the parts I need, but after pricing it out, I am under $20.. so I can afford this stuff. I just need to get the right stuff. It seems as though my dad is going to force me to see him tomorrow , so I won't be back till late tomorrow. I'll post up my questions then.


-justin

Sounds lik a great project you got going there. Let me know how it turns out. Also, do you need the whole ECU, or just the EPROM chip? I might be able to try to get to some of the local junk yards around here, and if I can, then I will try to get one and send it to you (if it is just the chip) I'd love to help, but I gave up all that Hardware stuff for some good ol' Software Engineering.

I have a 4 day weekend now, so I am going to gather up all the parts I need, and order them in the smallest quantity over 1. Hopefully I can solder it all up in less than 8 hours.. We'll have to see.

As far as the ECU goes, I am not quite sure just yet, I have yet to see one out except my dad'* OBDII in his '96 Suburban, and I didn't pay close enough attention. I am thinking all i'd need is the EPROM. If you find a dead '87 ECU, send it my way [the whole thing], I am really curious about what happens to those suckers, I've got my hands on a working '87 ECU, so I can have a comparison. I don't need the rest of the ECU to read the data [writing is not possible due to them not being re-writable], so honestly answering your question, [I know I am contradicting], I will just need the EPROM.. except if you find an '87. I want the whole thing [i'd be willing to reimburse you, but come to me with the prices first ]


-justin

ok so what can you do if you can make this eprom or w/e? Can you reprogram stock engine computers and such?

I got a spare box for my 95 SSEi if you wanna dork with that, lemme know. PM me or something with your address and I can ship it off. Sounds like what I wanted to do a while ago for my and other Chevy trucks......But that problem with money and my cash flow sucked and still does and I never could get into it.

But lemme know what you find, and what you are REALLY trying to do with these ECM'*. :P

Thanks,
Nate

Well 1/3 of the Eprom is set data, while the other 2/3 is what to do with data. I am thinking, that I should be able to poke around [its in hex, and only 32kB of data, not like it'll take me long]. I am thinking I will be able to mess with the fuel a little, but other than that, I don't think there will be much for me to control. I know the ECU does not control ignition whatsoever, so that is out of the question. I guess we'll just have to wait and see. I know for the bonnie'* with the 4T60-E transmission will gain a lot more benefits, because there is the possibilty to mess with the tranny, and probably more fuel related stuff. I won't be touching any Series II cars, because that is going to be waaaay beyond my skill level, and there is just so much stuff you can control, I will get lost.

However, the funding for this project is non existant. I want to get the overhaul gasket set [couple weeks away from that], plugs/wires [not going to come before winter], and some other misc fluids and such. So it probably won't get funded until spring, or early summer.. 'less I win the lottery.

-justin

Don't know if I care for the dorking with the tranny idea....I don't mess with tranny'* anymore, I buy the Hi performance parts for them and install them, no chips and no shift kits for me anymore...I really had a tranny get messed up because of a B&M kit, and it wasn't cheap to repair. But I do have a 4T60-E.