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Replacement eproms from the dealer should run between about $68-$120 depending on how greedy the dealer is.
The only special tools needed are an antistatic wrist strap and a large chip puller, both available from Radio shack for not too much.
Replacing the eprom takes about ten minuits. Disconnect the battery, Discharge any static from yourself, same as working on a computer ( touch and connect yourself to the computer housing for extra safety) remove the ecu, pry the cover tabs up with a screwdriver. remove the cover, inspect the PC board. if there are any burned componants on it, the problem is more severe than a bad eprom, but usually the eprom is all that's wrong ( dealer here told me that all they do to "rebuild"ecu's is replace the eprom...and charge $1300. if there are any burned componants on the board they consider it a non rebuildable core ), remove the chip carefully with the puller. install the new eprom( a pin straightner may be needed to straighten the pins on the new eprom to fit , they are cheapat RS ) put the cover back on and re install. It will run a bit strange the first couple of times you start the car.
Make sure when ordering the eprom that they look it up by the ECU # in your car and not by model and year or you'll likely end up with the wrong chip ( don't ask me how I know this one :-(
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-------Robert, '93 940t, '90 240 wagon, '84 240 diesel (she's sick) , '80 245 diesel, '86 740 GLE turbo diesel, '82 Mercedes 300SD for sale
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