87gta19

i have a 1987 trans am gta with digital dash.the speedometer not working ,the odometer is flashing and the fuel gage stays at full.every thing else is working.all the lights . any ideal why the odometer flashing and does that have anything to do with the speedometer not coming on.any help would be appreciated

scooter

iTrader: (11)

I would start with a factory tech manual for your year. You can get them used off eBay very affordably now. I have been getting them in the $20-45 range, that is if you can't find it uploaded to the internet somewhere already. You can also get new re-prints from Helm Inc, at a higher cost.

87gta19

thanks ,i 've owned the car since 1988 .its probably time i get one.

scooter

iTrader: (11)

I love mine. When I had my 88 GTA I bought one new from Helm and I referenced it all the time. Now that I am making wiring harnesses, I refer to them frequently. I have quite a few now

87gta19

i tried the all data on line .didn't like it .books are a lot better.ill trying get one today.

scooter

iTrader: (11)

Someone gave me a copy of Alldata, that's not really great or complete either. The factory manual is the best

87gta19

just ordered one . should be here by mon.

Cehbra

iTrader: (1)

Is it flashing 9999999.9 ? If that's the case your eprom is toast and you'll need to replace it.

87gta19

Yes, ill try switching it out . the car starts with no problem,so i never thought that could be it. you witch out your dash .great job ,been reading your post. off subject I've been to Switzerland a few times back in 90 -93 .great place .I was in the army and stationed in Germany. Thanks for the help.

87gta19

i swicthed out the eprom with the original one.i had a hyperteck in it , to realize it was bad in 2009 not knowing thats probably what fixed it last time.when i put the hyper chip in it.i had replaced everything last time including sending the dash out to be repaired. so i really didn't know what had been wrong the first time this happened. ill have to find another one before i know if it works.next question would be is it normal for this to happen or am i doing something that blows them.like i said I've had the car since 1988, been 30 yrs.

scooter

iTrader: (11)

Two totally different, and unrelated, things

87gta19

can you clarify, is the eprom he's, talking about the small chip on the circuit board behind the miles in dash

Cehbra

iTrader: (1)

I'm talking about the EEPROM that holds the mileage, see here: https://www.thirdgen.org/forums/elec...o-86-88-a.html

It's the integrated circuit under that cage on the odometer PCB. Of course, when switching that chip for a new one you'll need to program it with a correct mileage - described in the thread I mentioned.

Here's an image from my digital dash swap thread, don't mind the arrows, it's all about that chip under the plastic frame to the right of the PCB connector

Cehbra

iTrader: (1)

The Hypertech chip is for the ECM and holds tuning data that controls the engine’s air/fuel ratio and spark advance and stuff. The EEPROM behind the odometer only contains an encrypted mileage data.

87gta19

thanks ,sorry took so long to reply back. i do appreciate the help.ill have to find another one .im going to call a place in clearwater fl ,tomorrow and see if they repair them .if they do i can post there name and phone#,if not ill try the place in new york ,that fix it the first time. if some one needs work done on theres.i haven't found any for sell in a while.digital dash i mean .i don't have a way to reprogram the chip .i was going to try and post a few pic.of the car if anyones wants to see it. its not all done but I've done a lot to it. its a work in progress . thanks again

87gta19

I've tried to get back to you ,not sure whats going on keep saying error when try to message you,i did get some pics on.

Cehbra

iTrader: (1)

If you want me to reprogram the chip you can send it to me, I also have a few spare ones left, shoot me a pm.

87gta19

i got the chip you sent odometer working .thank you. I'm still haven't got a reading for the speed. when i turn the key on or start the car .it should cycle from 0 to 188 back to 0. not showing anything.the back light is lit up ,no numbers. if the speed sensor or the speed buffer is bad would that give the no reading . or is there something else i should look at . thanks for any reply,

Firechicken86

iTrader: (1)

Did you manage to find a fix for this? I've been having similar issues

87gta19

no ,i haven't got it fixed yet, going to try and replace the speed sensor on trans. once i find one. the odometer not reading know ether.