Help with 1990 chip
Thread Starter
Heel & Toe
Joined: Dec 2012
Posts: 24
Likes: 0
Help with 1990 chip
I am asking questions for my Dad who is not so good with the computer so bear with me.
1990 Corvette Base Convertible Auto 2.73 gear. ANHW prom(chip). We have only had the car for about a month. The original chip is long gone. The current chip is from a manufacturer who, after several phone calls, is no longer in business and made chips for marine engines. But the chip is damaged. It has a big crack in it. I don't know what the deal is with that and am just telling you what I know:-)
We need a new chip but found that the OEM equipment is no longer available. So now what?
I have done some research on it and found that it is possible to burn a new chip with a programmer, software etc. But where to get the file to burn?
Thanks in advance,
Dave
1990 Corvette Base Convertible Auto 2.73 gear. ANHW prom(chip). We have only had the car for about a month. The original chip is long gone. The current chip is from a manufacturer who, after several phone calls, is no longer in business and made chips for marine engines. But the chip is damaged. It has a big crack in it. I don't know what the deal is with that and am just telling you what I know:-)
We need a new chip but found that the OEM equipment is no longer available. So now what?
I have done some research on it and found that it is possible to burn a new chip with a programmer, software etc. But where to get the file to burn?
Thanks in advance,
Dave
Le Mans Master
Joined: Feb 2005
Posts: 6,479
Likes: 565
From: Clearwater Florida
........... Try posting up a Want to buy ad on the parts for sale forum ... you can do the same on www.Thirdgen.org ....... OR ... buy an aftermarket chip from Hypertech ... theirs are safe ... or a myriad of other sources ... TPIS ... SLP ... Arizona Speed and Marine ...... etc .... you might even check out the famous auction site ... you might be able to find an ECM with a Prom already in it ...........
.......... If the car is running , I wouldn't be too concerned about cracks in the plastic cover on the prom ............
.......... If the car is running , I wouldn't be too concerned about cracks in the plastic cover on the prom ............
Thread Starter
Heel & Toe
Joined: Dec 2012
Posts: 24
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Thanks.
The car is not running, well, it sort of sometimes runs. If you touch the chip it runs or doesn't run..cuts in and out. The chip has cracks that if you hold a flashlight to it you can see through the cracks.
We haven't attempted to remove the chip because I am pretty sure that it will come out in pieces.
I see that my local autozone has the hypertech chips. I don't want any race setups or anything extreme. A very mild street chip would be ok, but nothing more.
Also I see where some manufacturers chips require a "piggy-back" of the stock chip with the new chip. Pretty sure I can't use that.
The car is not running, well, it sort of sometimes runs. If you touch the chip it runs or doesn't run..cuts in and out. The chip has cracks that if you hold a flashlight to it you can see through the cracks.
We haven't attempted to remove the chip because I am pretty sure that it will come out in pieces.
I see that my local autozone has the hypertech chips. I don't want any race setups or anything extreme. A very mild street chip would be ok, but nothing more.
Also I see where some manufacturers chips require a "piggy-back" of the stock chip with the new chip. Pretty sure I can't use that.
Team Owner
Joined: Sep 2003
Posts: 25,393
Likes: 2,741
Hey Dave,
I have a '90 original ECM and PROM that I just responded to a WTB in the C4 parts section. I don't know that he's a buyer or NOT but I'd consider a sale to you if you'd like. I need to give him the opportunity to pass or buy though.
-Dave
I have a '90 original ECM and PROM that I just responded to a WTB in the C4 parts section. I don't know that he's a buyer or NOT but I'd consider a sale to you if you'd like. I need to give him the opportunity to pass or buy though.
-Dave
Thread Starter
Heel & Toe
Joined: Dec 2012
Posts: 24
Likes: 0
Dave,
It is my understanding that if the prom is not the ANHW the car will not start. As I have said in my original post I don't know much about the ecm and chips that are in these cars.
If you have the ecm with an ANHW prom I would definitely be interested. Please keep me in mind if the other buyer falls through.
Dave
It is my understanding that if the prom is not the ANHW the car will not start. As I have said in my original post I don't know much about the ecm and chips that are in these cars.
If you have the ecm with an ANHW prom I would definitely be interested. Please keep me in mind if the other buyer falls through.
Dave
Thread Starter
Heel & Toe
Joined: Dec 2012
Posts: 24
Likes: 0
I have some more questions for the gurus out there.
Since the chip that we have is not an oem would it work with a hypertech piggyback style chip? What information is needed from the OEM chip for the hypertech chip? The Limp Home and VATS are part of the OEM Memcal along with engine parameters, transmission, emissions, and rear end gears. So the use of the hypertech chip only modifies engine performance and uses the other info from the oem?
. The chip that we have works unless you tap on it. Then the car stumbles and stalls. We replaced the ECM and it quit doing the stalling but fouled all 8 plugs within a few minutes. We checked the injectors and found one bad one so we replaced all of them. The intake is filled with soot. So we cleaned everything and put it back together. It fouled the plugs within 3 minutes.
Today we removed the exhaust thinking that maybe the converter could be plugged. No such luck. The converter has been gutted. But we have a complete new exhaust on its way. But the entire exhaust is full of soot.
The car has 50K miles on it. Going to do a compression test next.
Since the chip that we have is not an oem would it work with a hypertech piggyback style chip? What information is needed from the OEM chip for the hypertech chip? The Limp Home and VATS are part of the OEM Memcal along with engine parameters, transmission, emissions, and rear end gears. So the use of the hypertech chip only modifies engine performance and uses the other info from the oem?
. The chip that we have works unless you tap on it. Then the car stumbles and stalls. We replaced the ECM and it quit doing the stalling but fouled all 8 plugs within a few minutes. We checked the injectors and found one bad one so we replaced all of them. The intake is filled with soot. So we cleaned everything and put it back together. It fouled the plugs within 3 minutes.
Today we removed the exhaust thinking that maybe the converter could be plugged. No such luck. The converter has been gutted. But we have a complete new exhaust on its way. But the entire exhaust is full of soot.
The car has 50K miles on it. Going to do a compression test next.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The key is to get a chip that matches your setup. The main variables are:
Type of transmission (manual vs. automatic)
Rear axle ratio (used to calculate speed and which gear you're in)
MAF or MAP (older cars have MAFs, newer ones are MAP)
The stock programming is available. They are called BINs (short for "binary" and the files have a .BIN extension). These files can be used to program a blank EPROM if you (or a friend) have the "burner" to do that.
There are a ton of BIN files here (but I didn't see ANHW -- are you sure that's the right one?):
http://gearhead-efi.com/gearhead-efi/bin/
Le Mans Master
Joined: Mar 2002
Posts: 5,889
Likes: 2
From: Castro Valley Calif.
St. Jude Donor '03 thru '26
You'd need a G-1 adapter from Moates available here: http://www.moates.net/g1-memory-adapter-tpi-etc.html
You'd need an SST 27SF512 chip to program also available from Moates here: http://www.moates.net/c2-sst-27sf512-chip.html (this is what you'll have programmed with your stock bin)
You'll need some sort of compatible chip for your year to plug into the G-1 adapter (you'd only be using the limp home function as all other parameters will be in the bin you'll program)
Lastly, you'd need to confirm what bin file you need. Cliff is right on, as I don't see an ANHW broadcast code either. Take a look at this link, it gives you two options for a 90 Y car (corvette): http://www.gearhead-efi.com/Fuel-Inj...hlight=1227730
Edit:
This discrepancy on bins bugged me, so I did some more research. I found that an ANHW bin does exist (although I can't locate the file). My information is that it's the same as an ANHT bin *except* the gearing. An ANHW bin uses a GU2 gearing RPO and the ANHT bin uses the G44 RPO. Good luck!
Last edited by Caboboy; Dec 29, 2012 at 01:08 AM. Reason: Add'l info
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Thread Starter
Heel & Toe
Joined: Dec 2012
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http://forums.corvetteforum.com/c4-s...broadcast.html
Unfortunately yes I am 100% sure ANHW is correct. I have found that it was specific to the 1990 base convertible 4 spd auto 2.73. And is the most rare nowadays...aren't I the lucky one.
Unfortunately yes I am 100% sure ANHW is correct. I have found that it was specific to the 1990 base convertible 4 spd auto 2.73. And is the most rare nowadays...aren't I the lucky one.
Thread Starter
Heel & Toe
Joined: Dec 2012
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There were 7 different broadcast codes for 1990 Vettes.
I have a 1227727 ecm. I have found that the Camaro used the same computer and the same broadcast code but is not listed as having (not sure about this) a "speed density" sensor or somthing to that effect.
I have a 1227727 ecm. I have found that the Camaro used the same computer and the same broadcast code but is not listed as having (not sure about this) a "speed density" sensor or somthing to that effect.
Team Owner
Joined: Sep 2003
Posts: 25,393
Likes: 2,741
The key I believe is in a Corvette the PROM is looking for CCM information and substituting Camaro and others there is no CCM so it can't see it or run. I believe that any '90 model BIN burnt to a proper V8 PROM would make the car run. Missing will be the 2.73 gearing information but is it significant.
I'd suggest entering the VIN here and check the information:
http://tis2web.service.gm.com/tis2web
I used a '90 eBay VIN and I was given all four options and I needed to choose based on production codes. The 2.73 was never modified. I used 1G1YY3387L5117105
I'd suggest entering the VIN here and check the information:
http://tis2web.service.gm.com/tis2web
I used a '90 eBay VIN and I was given all four options and I needed to choose based on production codes. The 2.73 was never modified. I used 1G1YY3387L5117105
Last edited by WVZR-1; Dec 29, 2012 at 02:34 AM.
Thread Starter
Heel & Toe
Joined: Dec 2012
Posts: 24
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Thank you to everyone for all the research and information.
When we bought this car it was "for a great price". And it was, but we certainly didn't expect all this.
Without the proper shift points and transmission info it "may" run but certainly wouldn't drive well.
Maybe I could find a prom first, then just change the gear to match whatever prom I could find. Sounds easier than finding the correct prom at this point.
I would be more than happy at this point to buy the programmer etc. But without a .bin it won't help.
At this point I don't even know if the chip that's in it has the proper shift points or not.
When we bought this car it was "for a great price". And it was, but we certainly didn't expect all this.
Without the proper shift points and transmission info it "may" run but certainly wouldn't drive well.
Maybe I could find a prom first, then just change the gear to match whatever prom I could find. Sounds easier than finding the correct prom at this point.
I would be more than happy at this point to buy the programmer etc. But without a .bin it won't help.
At this point I don't even know if the chip that's in it has the proper shift points or not.
Last edited by DK Pony; Dec 29, 2012 at 06:33 AM.
Thread Starter
Heel & Toe
Joined: Dec 2012
Posts: 24
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I don't know anyone with a 90 Vette Convertible with a 2.73 gear, 4 sp auto that would let me remove the chip (that is no longer available and VERY hard to find) and copy it.
Last edited by DK Pony; Dec 29, 2012 at 09:51 AM.
Le Mans Master
Joined: Sep 2000
Posts: 6,303
Likes: 714
From: Bartlett IL
I am asking questions for my Dad who is not so good with the computer so bear with me.
1990 Corvette Base Convertible Auto 2.73 gear. ANHW prom(chip). We have only had the car for about a month. The original chip is long gone. The current chip is from a manufacturer who, after several phone calls, is no longer in business and made chips for marine engines. But the chip is damaged. It has a big crack in it. I don't know what the deal is with that and am just telling you what I know:-)
We need a new chip but found that the OEM equipment is no longer available. So now what?
I have done some research on it and found that it is possible to burn a new chip with a programmer, software etc. But where to get the file to burn?
Thanks in advance,
Dave
1990 Corvette Base Convertible Auto 2.73 gear. ANHW prom(chip). We have only had the car for about a month. The original chip is long gone. The current chip is from a manufacturer who, after several phone calls, is no longer in business and made chips for marine engines. But the chip is damaged. It has a big crack in it. I don't know what the deal is with that and am just telling you what I know:-)
We need a new chip but found that the OEM equipment is no longer available. So now what?
I have done some research on it and found that it is possible to burn a new chip with a programmer, software etc. But where to get the file to burn?
Thanks in advance,
Dave
Thread Starter
Heel & Toe
Joined: Dec 2012
Posts: 24
Likes: 0
The current chip is from a company called Texas Speed and Marine. I have contacted the company and was told they stopped doing any prom programming in 1995. The couldn't tell me anything about the chip so I have no idea what I have.
"The chip that we have works unless you tap on it. Then the car stumbles and stalls. We replaced the ECM and it quit doing the stalling but fouled all 8 plugs within a few minutes. We checked the injectors and found one bad one so we replaced all of them. The intake is filled with soot. So we cleaned everything and put it back together. It fouled the plugs within 3 minutes.
Today we removed the exhaust thinking that maybe the converter could be plugged. No such luck. The converter has been gutted. But we have a complete new exhaust on its way. But the entire exhaust is full of soot.
The car has 50K miles on it. Going to do a compression test next. "
I downloaded the CALDATA program and yes it shows the info for the ANHW prom. But I'm not quite sure what to do with it. Sorry, but the whole PROM thing is kinda new to me. Everything I know I have learned in the last few weeks working on this car.
"The chip that we have works unless you tap on it. Then the car stumbles and stalls. We replaced the ECM and it quit doing the stalling but fouled all 8 plugs within a few minutes. We checked the injectors and found one bad one so we replaced all of them. The intake is filled with soot. So we cleaned everything and put it back together. It fouled the plugs within 3 minutes.
Today we removed the exhaust thinking that maybe the converter could be plugged. No such luck. The converter has been gutted. But we have a complete new exhaust on its way. But the entire exhaust is full of soot.
The car has 50K miles on it. Going to do a compression test next. "
I downloaded the CALDATA program and yes it shows the info for the ANHW prom. But I'm not quite sure what to do with it. Sorry, but the whole PROM thing is kinda new to me. Everything I know I have learned in the last few weeks working on this car.
Le Mans Master
Joined: Sep 2000
Posts: 6,303
Likes: 714
From: Bartlett IL
Well if its in a 7727, you're using an $8D calibration. Need to download the memcal and burn it to a new one. Could be the solder joint. Find another memcal, doesn't matter BCC as long as it is a 90 Vette. Erase and reflash.
I would imagine that the calibration isn't very different from the other BCCs for the 90 but that can be compared. Or you could buy a Moates G2 adapter and just burn a new chip riding piggyback on the original.
I would imagine that the calibration isn't very different from the other BCCs for the 90 but that can be compared. Or you could buy a Moates G2 adapter and just burn a new chip riding piggyback on the original.
Thread Starter
Heel & Toe
Joined: Dec 2012
Posts: 24
Likes: 0
Thread Starter
Heel & Toe
Joined: Dec 2012
Posts: 24
Likes: 0
I DON"T have the OEM Chip to begin with. I don't know if it's possible to put a NON-OEM chip on a NON-OEM chip or even if the chip I have is the correct gear ratio etc.