So earlier today, I taxied out and, during the run-up, discovered that my carb heat wasn't working. I tried everything I knew to fix it, but nothing worked (turns out the wire was broken), and I taxied back to the, ramp, switched planes, and went out and did my x-c flight as planned.

However, I did log quite a bit of time taxing out, trying to fix the problem, and taxing back, and was wondering if this time was still "loggable." I remember hearing somewhere that, as long as you intend to go flying, all time during that period can be logged, but I might be wrong. Please, help!