why does my 89 toyota idles high when i turn on my head lights?

Asked by Jul 16, 2012 at 02:35 PM about the 1986 Toyota Corolla DX

Question type: Maintenance & Repair

3 Answers

190

check aternator to make shure its out put is correct,engine may be compensating for lack of power to headlamps

brand new alternator, could it be a relay?

How high is "High"? If you mean it increases by 2-300 rpm, that's just the alternator needing that much more speed to compensate for the draw, as told to by the "brain"..if you mean increases by 2000, then I am stumped myself.

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