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Not a chip but an ECU reprogram through the... (archive)
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Posted by Stephen on June 11, 2001 at 09:36:43:

In Reply to: What is involved in installing the Jim C chip? posted by ///MFrank on June 11, 2001 at 09:12:48:

...diagnostic port in the engine bay. All DIY without removing the car's ECU.

While you have a charger hooked up to the battery (to maintain voltage levels) you connect the "Injector", an item just like a service light reset tool, to the diagnostic port. It downloads the existing software and then uploads the new software. Takes about 10 minutes preparation and 5 minutes with the Injector. The instructions are very clear.


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