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My understanding of the Exhaust Temp light is that it is a fused light. As new, it would blink when the exhaust temp was too high until eventually remaining on due to the high temps "blowing" the fuse. This was to prompt you to get your fuel injector tuned and thus fix the problem. I suspect the mechanic was then supposed to replace the fuse and the light would return to normal operation.
Having said that, the light on my '78 has been on since I purchased it and I've had both the cat replaced (I suspect it failed for exactly this reason) and the fuel injection tuned since. She runs like a dream now, but I still can't figure out where that fuse is so that I can replace it.
Does anyone know?
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