I have a burner and I have downloaded the proper bin file for my 85. The one I got is the newer fixed version of the original. Problem is I dont know which blank to get to load it up. I currently have a Jet Chip in there, that someone else put in it before I bought it. I have no desire to be chirpin 2nd gear like it does now or have my TCC lockup at 57 MPH. Ya its fast...But It wont pass Mass emissions, and frankly I dont need the grief. So either I gotta find someone with an updated PROM that wants to trade with me or burn one on my own. Id rather not have to stack the bin if possible. Is it as easy as loading the .bin file into the burner and lettin it go?? any help is appreciated Thx Frank

 

You need the 2732 or 2732A or, 27C32. The best chip is to use a 29C256 along with a Craig Moates G2 adapter.

Go here: http://www.moates.net/product_info.p...products_id=36

If you use this adapter you can use a flash memory chip that does not require a UV eraser. Using the forementioned 27 series proms, you need a UV eraser if you don't have an ample supply of these old chips to just burn and throw away. Not to mention they are getting harder and harder to find new chips. You can get all the used (pulls) that you want, but I find that there is a 30% of the chips I get are bad.

 

2732A chips are a huge pain in the butt.. Convert yours over to a flashable chip with the product mentioned above..

When I have to burn a 2732A chip I usually go threw a pile of 10 before I find one that will take a program ok.. That usually makes me want to send something threw the wall or out the window if you get my drift.

the 2732's stopped production in the 80's so you can imagine all thats left have been sitting around in warehouses or pulled from other eq and erased..

 

Alvin, I think a lot of the old 2732s came out of old Asteroid video games I would much rather have the Asteroid game than trying to salvage old 2732 chips. I think I get 2 out of 5 that I can get to take a program. I have a decent supply of 2732A chips that are brand new that I got out of a paper mill that I worked at a few years ago. They are worth their weight in gold now

 

They honestly make me hotter than hell..

When I tune them on the dyno/locally i'll use a emulator and a little modular device I came about.. When it comes down to burning the chip when the tune is finished thats where the anger comes out!

 

I sure wish you were close to me here on Cape Cod Alvin...Id have this car in your lot tomorrow. I just dont know what else to do. My BLM's are runnin 108...O2 about .800 I know its rich ... HC is at about 440. wont Pass emissions. Weird part is that its so erratic...Today purrs like a kitten tomorrow runs like sh*t. Idles perfect today hunts up and down tomorrow..You just never know what today will bring. Sometimes I get a check engine light..shut it off to check it....Lites out when it restarts. I do have a 43 code for ESC and a 45 Rich code and a 33 Ocde for MAP. I didnt think I had a MAP in my 85..Do I? If not whats this 33 all about>> thx in advance frank

 

33 is a MAF code in that year.. Try turning up the MAX gm/sec.. I believe it is vs. RPM in the 85's.

If you send me a bin I can push the limits up for you and return it back.

 

OK guys... I gotta ask this question. Its keeps buggin me why we all need to do so much tweaking, scanning, and burning etc. If someone were to tell me that 1985 Corvettes never ever ran right out of the factory (Or other years as well) Then I can see why all this is necessary. On the other hand, If they did in fact run right...Why dont they now?. I keep wanting to think that somehow I'm just masking a problem by trying to reburn proms etc for a car that I would think should have run properly in the first place. Why doesnt the ECM do what its supposed to do if all the sensors etc are working properly?
I know there were some issues with the first prom used in these cars, but there was an upgrade available that supposedly fixed the issues. I guess the bottom line here is...Does anyone on this forum have an 85 with the newer chip installed that does indeed run properly..Passes emissions, and does what its supposed to do? Because if there is then mine should as well, without goin through all this misery. Id be interested on your thoughts... Thx Frank

 

I have to admit my '85 has a bit of Christine in her. I've had my first vett for almost a year and it just rolled 40K miles yesterday.

From lurking here, learning everything I can about TPI and doing the things necessary to restore the fuel system and drivetrain back to factory standards I have realized that the 870 ECM is just like any other computer. It will only do what it is told to do. By this I mean that I can replace every sensor and calibrate every adjustment by the book, but if you have a 20 year old car, you have a 20 year old car. There's dozens of connectors and plugs as well as miles of wire that with age, deteriorate due to the environment (happens to us too) and these conditions affect the sensor information that the computer is relying on to make the decisions it is programmed to make based on the input it is fed.

These are the arteries of the system and in my case, I'm looking at facing bypass surgery to get mine back to stock peak performance. Chasing down individual conductors is the only thing I have not done to eliminate some flaky weird problems that come and go. I'm also running slightly rich (high HC just under the limit).

I recently passed my emissions on the first run, even after the previous owner told me he never passed on the first try. But knowing it was coming, I have spent all spring and summer under the hood doing all the basic tune up stuff.

Here's what worked for me:

removed and cleaned throttle body
installed new IAC
replaced intake gaskets
sent injectors out for reconditioning
eliminated several poor vacuum connections
new cap, rotor, wires, plugs
set base timing
set minimum idle
calibrated TPS sensor position

As far as tweaking the computer goes, curiosity drives my craving to tune in and turn on. I want to learn everything I can about how my car works. It is also because "I can". In years past it used to smoke my A** when a service advisor would tell me they just had to clear a code and charge $25.00 to push a button. I have always resented being locked out of technology that I own (remember the old videocipher days?).

I am noob with a capital N, but I am loving every minute of it. I've searched high and low for info on '85 programs and never knew of a factory upgrade rom to improve the system.

The way I see it is that all the time and effort GM put into these things when they designed them back in the '80s has been surpassed by a large collective of individuals who have utilized troubleshooting, reverse engineering, trial and error, and the use of good old American ingenuity. They have created a cottage industry and given us the ability to bolt on more horsepower and make it work. This group has shared this information and made available the technology to learn as you go at your own pace.

Sorry for the long winded speech, but I share your frustration in trying to get your '85 "right". If I knew then what I know now, I would have passed on this car due to the bastard 870 ECM and gotten an '86 - '89. Hmmm, maybe I should start looking at doing the 870 to 165 swap...

Good Fortunes,

L8-4DNR

 

If you are interested I have two full tubes of brand new 27c32 chips (that's 30 chips) - extras from playing around with My '85 this summer. Glad to pass some along to anyone that needs them - I doubt I'll use up any more now that I'm happy with the program I have. I found these on ebay - cheap.

BTW - MAF high code (33) is avoidable by turning Down (not up) the gm/sec vs. MAF counts around the 200 rpm area - this is where the code sets - more than 90 gm/sec at less than "half" throttle and less than 2200 rpm.

Also BTW - using an x-tronics pocket programmer (and Tunercat) I had NO problems burning chips or editing the code. Worked fine, no wasted chips, no issues.

You'll also need the little plastic chip holder/adapter for the eprom - they are available - Alvin?