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I recently purchased and had professionally installed a SuperChip for my Expy. It was quite impressive in all facets: good acceleration, better shifting, etc. However, after about 900 miles it failed and not nicely. I was driving about 50mph and the engine stalled. No warning or anything. When this happened, I had not ever touched the installation...the tape was still holding the chip to the computer. When I pulled the chip out, not only did the engine start up but it ran fine. I did a bunch of testing (chip in/chip out) and concluded the chip was causing my problems (stalling, speedo/tach guages going crazy, etc). I took it back to where I bought it and had it replaced. The shop (a local custom Mustang performance shop) said the old chip would not even verify. So far after about 100 miles, the new chip seems fine.
Any ideas as to why the chip would work for 900 miles and then suddenly go belly-up?
>Power surges, chip jiggling loose and shorting, bad handling
>when installed (ie, static).
Thanks for the feedback Ken. I don't expect that "bad handling" was the culprit since it did work for 900 miles. The chip itself was very securely taped to the computer so I also doubt this was the problem. Now, about the power surge, I was running the AC at the time of the failure. Would the AC cause a surge? If so, would this suggest something else is wrong?
I'm just a little nervous since we never figured out what caused the chip to fail and failing at highway speeds was a little scary.
Though rare, its not unheard of for one to simply fail. Just like any electronic component, passing a test under ideal circumstances (ie, hooked up to our programming hardware) is different from actual real-world burn-in.