ECU Resetting

Hello,
First off I would like to thank all on this group for thier wonderful information. It has made my first Rover experience very good,
especially for troubleshooting. I had been stumped by my stalling and cut out problem since buying the truck a month ago. I had replace all I could think of, short of the fuel pump, with no improvement. I was getting ready to replace the pump when I read a post about the occasional ECU dry solder problem. I thought why not give it a try. So, I pull the ECU, open it up and re-solder the main transistor joints, although they did not look real bad. I had the the ECU out for about 45min. I reinstalled the ECU and the truck fired up, the check engine light was off, and I have not stalled in 3 days. Also the truck seems like a completely different vehicle. The power and acceleration is up dramatically and the fuel economy is also improved. So, the real question is- did I fix a dry solder joint or is this happy rezzurection from restting the ECU alone? (Starting a new fresh fresh fuel mapping from the factory default) I thought perhaps it could be from the reset. If so, I'm amazed. Even if I changed the correct part that was causing the fault would the ECU still behave as if I didn't unless it was reset? And therefore run the injectors the same (stall)? Fingers crossed that this fix holds.
thanks again,
joe myers
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you don't say which ecu but some certainly have the ability to learn, I remember seeing an article or post on resetting and the drive/trip (about 20 min ISTR) you should do to reset it properly. did you get any diagnostics first, like P1176-9, I think these are the ones that deal with air/fuel mixture learnt offsets.
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Do you recall where this was? I think I did mine no favours by reseting it them sitting traffic for 5 mornings.....:(
Neil

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Neil,
It is the fuel injection ECU under the passengers seat (USA). Keep in mind, my reset was accidental as I removed it to repair it. I drove it around the neighborhood for 20 min, the engine light didn't return, and it did not stall so I took it out to the freeway and ran it at 65mph for about 8-10 miles. It's been great so far. I am glad I took it out to the highway for awhile because if resetting it causes it to remap fuel and driving behavior, i'm glad I got that in. All purely accidental. Of course there is always the remote possibility that I actually repaired a dry joint in the ECU. I just can't give myself that much credit. One thing troubleshooting sure does is get you familiar with you vehicle very fast.
joe

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