1G 1G Bad ECU?

[djmixerx]

does anyone know how i could check if my ECU is bad? i had my Eprom Ecu installed in my car since i got my car. For some reason it just stopped working couple days later when i installed my Stutterbox. i check all my wiring i looks perfectly fine nothing ripped off or not connected. Could i just be the Eprom that is bad or the whole ecu is bad. The CAPS look good and they dont smell. i put in another stock ecu and it makes the car run fine but its not a eprom. When i put the eprom back i hear my fuel pump run for a long time and it start for like 5 secs sounding like its miss firing and dies. the idle only goes about 500rpms then it wont shut off. it might be either flooding or bad miss firing. i dunno can anyone help? itsa bout 4am i could probably look over this but im tired but im trying to make it up to the race this weekend. got any question just ask.

Thanks

 

[luvmygst]

Did you use and external stutterbox or a 2step that is on the chipped ecu?

 

[djmixerx]

the one in the ecu

 

[dsmotorsports]

If you put a ecu in it and the car run fine, that tells you "BAD" ecu. In all honesty, i have tried a lot of ecu's and a e-prom ecu does not run as well as a 93 tsi ecu, unless you are just wanting that stutter or other burnt chips i suggest you find a 93 ecu and try it.

 

[steve]

I have tried a lot of ecu's and a e-prom ecu does not run as well as a 93 tsi ecu.

That's interesting. The EPROM version of a given ECU shouldn't behave any different than the non-EPROM version.

djmixerx,

What does the EPROM ECU do if you put the factory chip back in?
Did you buy the chip new or is it a hand me down?

Steve

 

[djmixerx]

for the eprom ecu i put bad the factory chip it starts revving up to 2k rpms and goes down and up in idle. like its crazy camming. i put the stock 90 non eprom and it works just fine. i might be my MAFt though. My MAFt is not reading and rpm. its blinking green but i dunno how to check for signal. does anyone know how. it doesnt blink when i start it up but when i finish driving to my house i check under my hood and its blinking. I am suppose to tap into CAS black wire right? i put a test light to the black wire no signal is that how u do it?

for the chip it came with the car. it ran fine for like like 1yr now for some reason it just started to act up after i install the stutterbox.

 

[steve]

for the eprom ecu i put bad the factory chip it starts revving up to 2k rpms and goes down and up in idle. like its crazy camming.

Sounds like idle surging.
Both the EPROM and non-EPROM ECUs are '90 versions correct?

for the chip it came with the car. it ran fine for like like 1yr now for some reason it just started to act up after i install the stutterbox.

If you have been running this chip for a year what did you do just recently to install the stutterbox in the ECU? Usually that would be a new chip.

Steve

 

[djmixerx]

so ## saying that the chip went bad?

yea both ecu r from a 1990. my stock one w/o eprom works fine. the one with eprom it seems like something wrong but could the stutter box really mess up the ecu since all its doing is ground itself out?

 

[steve]

so ## saying that the chip went bad?

No, I'm asking you what you did since you say you installed your stutterbox the other day but also say it's a software stutterbox. So, what exactly did you do? Wire the clutch switch in?

Right now I'm thinking the ISC or ISC drivers have gone bad.

Steve

 

[djmixerx]

i just wired up the stutterbox. pin 104 to the back of the clutch wire. thats all i did. the next day it started acting up. i guess the ecu was still learning something.

The ISC is fine cuz the car working perfectly fine right now. no surge ## anything.

 

[steve]

It does take the ECU a while to relearn the fuel trims and other parameters.
The farther you are from the correct settings the longer it takes. I set my BISS, CAS, and SAFC setting (or EPROM tuning) right after a ECU reset so that I'm using the base setting on the ECU when I start tweaking. They afterward when I swap in a different ECU for testing the car pretty much runs right as soon as it starts up.

Steve