Originally Posted by voxmagna
I suspect they can't trust a dealer network to upload an updated eprom image to the existing eprom. If the update fails part way through, the ECU could be dead and they'd have to send it back anyway.
Well, the reason I asked was I had the Rhinewest upgrade (chip and cam gears) done just after July 4th. And, along with a difference in performance (all good once warmed up) came this old issue with cold starting. Engine would either stumble or die when the throttle was opened. Did the TPS reset, no change. Just like old times...
Called Rhinewest, and got to speak with Hank. I explained my concerns, and his suggestion? Disconnect the battery overnight, reset the throttle again, and call with the results.
I suppose different ECU's drain down at a different rate, and mine didn't get completely drained such that the ECU didn't appear to nead to download the fuel map from the EPROM. But, the throttle response when cold was spot on at this point.
I've seen a fuel-usage improvement of around 2 MPG, but that's over just two tanks. It's better tracked over 5 tanks, as you never fill it up exactly the same, and I've squeezed in another ½ gallon at times after the nozzle clicks off.
Runs better...just as advertised. Nothing more than commute at this point, but the throttle response is noticably better, just manuvering throug traffic this morning. I'm heading to Laguna Seca this weekend, so I'll have opportunity to see all of the improvement.
Props to the good folks at Rhinewest, too.
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