Help with 1990 chip
Le Mans Master
Joined: Feb 2005
Posts: 6,479
Likes: 565
From: Clearwater Florida
....... Check for raw fuel in the vacuum hose that runs from the rear of the plenum to the fuel pressure regulator ... sounds like you might have a ruptured FPR diaphragm ............ As far as the PROM's are concerned ... the car will start and run just fine as long as the PROM itself is for a 1990 code ... the gear ratio wouldn't change the fueling maps much at all ... and the only function of the transmission that's controlled by the ECM is the timing / road speed at which the converter clutch locks up ..........
Last edited by C409; Dec 31, 2012 at 08:26 AM.
Team Owner
Joined: Sep 2003
Posts: 25,393
Likes: 2,741
You might add a location to your profile.
There's likely someone in the vicinity that might offer up some assistance. Might even have a PROM you could try. You're way to concerned about the code! Your car IS NOT the only car with the code, a vert it was the base ratio and PROM but a base coupe with the same axle ratio is the same code PROM also. Again - you're way to concerned with the PROM ID! MY OPINION!!
Le Mans Master
Joined: Mar 2002
Posts: 5,889
Likes: 2
From: Castro Valley Calif.
St. Jude Donor '03 thru '26
Post 8 gives you a step by step solution if you don't have access to an ANHW prom. Just use an ANHT & modify the shift points in the bin if you find it necessary.
Le Mans Master
Joined: Sep 2000
Posts: 6,303
Likes: 714
From: Bartlett IL
Using a prom burner/reader, you read and download the calibration FROM your current chip. If it works currently, unless you tap it, You should be able to use it. I doubt they changed anything from stock except maybe some timing or additional fuel top end. For those you probably could compare to an ANHT bin file. the VE and SA tables are probably identical.
Once you have read the current chip, you could make changes to it using an editor like TunerPro 5.0. Then just flash a new memcal. Voila!
If some if this is confusing, suggest you go to thirdgen.org and read the stickies in the DIY-Prom forum.
Once you have read the current chip, you could make changes to it using an editor like TunerPro 5.0. Then just flash a new memcal. Voila!
If some if this is confusing, suggest you go to thirdgen.org and read the stickies in the DIY-Prom forum.
Thread Starter
Heel & Toe
Joined: Dec 2012
Posts: 24
Likes: 0
Oooh, so I can make changes to a program?
Sorry guys. I didn't realize that I (as in at home) could make changes to a prom myself.
I think I get it. Download an ANHT or whatever prom for a 90 model. Then I can change that info to a 2.73 gear if necessary?
All of this computer stuff is very new to me. And this Corvette stuff is even newer.
I was under the impression that I had to have the EXACT .bin or memcal or whatever before I could burn it to a new prom.
That helps a lot. I was getting pretty aggravated with the fact that GM would just quit making the one thing that without it the car is DOA.
Oh and the Fuel Pressure Regulator is good. But I am thinking that it may have a weak coil or be getting a really weak spark. The GM HEI is one thing I am familiar with from my Camaro days.
Sorry guys. I didn't realize that I (as in at home) could make changes to a prom myself.
I think I get it. Download an ANHT or whatever prom for a 90 model. Then I can change that info to a 2.73 gear if necessary?
All of this computer stuff is very new to me. And this Corvette stuff is even newer.
I was under the impression that I had to have the EXACT .bin or memcal or whatever before I could burn it to a new prom.
That helps a lot. I was getting pretty aggravated with the fact that GM would just quit making the one thing that without it the car is DOA.
Oh and the Fuel Pressure Regulator is good. But I am thinking that it may have a weak coil or be getting a really weak spark. The GM HEI is one thing I am familiar with from my Camaro days.
Last edited by DK Pony; Dec 31, 2012 at 08:42 PM.
Racer
Joined: Dec 2012
Posts: 301
Likes: 2
From: NY
Call these guys and they can hopefully get you up and running!
http://www.hotrodlane.cc/
I installed a TPI 350 V8 in my Jeep Wrangler. The TPI was from a 305 IROC Z from 1987. Street and Performance hooked me up with a harness and computer with a chip set up for all my specs. I currently run a Corvette computer with a MAP system. Changed over from the MAF system. I can't imagine them not being able to provide you with an appropriate chip. Good Luck.
Last edited by Glenno; Jan 2, 2013 at 07:22 AM.
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Le Mans Master
Joined: Sep 2000
Posts: 6,303
Likes: 714
From: Bartlett IL
Again, I would try reading the chip you currently have and do a compare to an ANHT bin. You will need a chip reader/burner to download the calibration and then burn a new one.
Thread Starter
Heel & Toe
Joined: Dec 2012
Posts: 24
Likes: 0
I have a .bin for an AXCS. It's a 91 5.7 Auto 2.73. The 91 uses the 7727.
My understanding is that the speedo is controlled by the speed sensor located on the transmission and NOT through the ECM. So why is the gear ratio even a factor in the prom? Does the ecm take shift points from the Speed Sensor?
Should I get an ALDL cable or a chip reader/burner?
Has anyone ever heard of Cardone? A friend at the local Autozone claims he can order the ANHW or any other prom from Cardone for $70.00.
I told him to go for it and see what happens. He put in the numbers and now we have to wait to see if it is rejected. That's the first time I have ever heard of that from Autozone.
My understanding is that the speedo is controlled by the speed sensor located on the transmission and NOT through the ECM. So why is the gear ratio even a factor in the prom? Does the ecm take shift points from the Speed Sensor?
Should I get an ALDL cable or a chip reader/burner?
Has anyone ever heard of Cardone? A friend at the local Autozone claims he can order the ANHW or any other prom from Cardone for $70.00.
I told him to go for it and see what happens. He put in the numbers and now we have to wait to see if it is rejected. That's the first time I have ever heard of that from Autozone.
Last edited by DK Pony; Jan 4, 2013 at 09:56 AM.
Drifting
Joined: Aug 2010
Posts: 1,704
Likes: 8
Go to the Gearhead EFI site and register yourself,you have acces to their database with everything you need
http://www.gearhead-efi.com/Fuel-Inj...Information-8D
you can find most of GM file .bin, i've searched for you and i find the ANTH 90 vette auto with 3.07 rear end,or the 91 AXCS vette auto with 2.73 rear end,you can burn these file on a 27C256 type eprom using an eprom programmer...
Cardone is a remanufacturer
http://www.cardone.com/find-parts/ve...ette&year=1990
http://www.gearhead-efi.com/Fuel-Inj...Information-8D
you can find most of GM file .bin, i've searched for you and i find the ANTH 90 vette auto with 3.07 rear end,or the 91 AXCS vette auto with 2.73 rear end,you can burn these file on a 27C256 type eprom using an eprom programmer...
Cardone is a remanufacturer
http://www.cardone.com/find-parts/ve...ette&year=1990
Last edited by tunedport85inject; Jan 11, 2013 at 03:01 PM.
Thread Starter
Heel & Toe
Joined: Dec 2012
Posts: 24
Likes: 0
Sorry for the delayed response. Autozone is having no luck ordering from Cardone. Everytime they put in the number it is rejected in a couple of days.
Tunedport85inject: I appreciate that info. I was in the process of ordering the programmer and wasn't sure what chip to burn the .bin onto.
I am going to try the AXCS and see how that works out. I've got a little time as we have pulled the x-brace and entire exhaust out from under the car to do some work on it.
Tunedport85inject: I appreciate that info. I was in the process of ordering the programmer and wasn't sure what chip to burn the .bin onto.
I am going to try the AXCS and see how that works out. I've got a little time as we have pulled the x-brace and entire exhaust out from under the car to do some work on it.
Drifting
Joined: Aug 2010
Posts: 1,704
Likes: 8
you can also call PCMforless ,the guys there can give you lot of info and a base tune for your MY,but you can also post on the SCAN & TUNE section of the forum
if you want to burn an eprom by yourself using a programmer the type eprom is a 27C256.Go to the Moates site for more info,there are also other type of prom you can use...
http://www.moates.net/
if you want to burn an eprom by yourself using a programmer the type eprom is a 27C256.Go to the Moates site for more info,there are also other type of prom you can use...
http://www.moates.net/
Last edited by tunedport85inject; Feb 3, 2013 at 03:19 PM.
