Put in EPROM, now car dies at idle

[talon96tsi]

Hey guys,

to be honest im very new to the idea of an eprom, but i came across one from a 92 gsx m/t that my buddy had and bought it. currently, th ecu is in my 91 TSi awd m/t. Ive heard that you need to give the ecu tme to reset everything but ive put over 150 miles on it since i got the ecu, and all it does is idle high, then stall. i cant even sit at a red light the car dies. do i have to get this thing socketed with a new chip? or should i fix the caps n my other ecu and wait till i have money for dsmlink to get the ecu working right. Any input would be great, thanks.

 

[DSM90AWD]

Has the EPROM in the new ECU been "modified"? If it is not "socketed" already then the chip is stock. FYI.. some common modifications are increasing the idle speed (helps with lopey cams) and fuel/MAS compensation, any of which may be causing your problems if it is "modified".

Does/did you see any of the same problems with your stock ECU?

As for resetting, you should always disconnect the (-) battery connector prior to removing the ECU

 

[talon96tsi]

its a stock eprom, and no i didnt have any of these problems with my old ecu which wasnt an eprom. i didnt disconnect the neg battery connection when i swapped the ecu's. should i reset it now?

 

[DSM90AWD]

should i reset it now?

\
The ECU resets itself after ~15secs of power interruption, so doing so now would be pointless. I was more referring to the safety factor of re/re the ECU with power still connected.

It's possible your new ECU is still "learning", whereby it will eventually correct the idle surge. Or it could be a intake/boost leak, bad or dirty ISC, or the ECU itself is problematic, in which case you will need repairs

 

[talon96tsi]

ok thanks!