1991 honda civic engine slows when headlights turned on?

hi 1991 honda civic engine slows down when i turn on the head lights ? is there any thing serious with it.. i recently changed the batteries, bulb's and radiator on the car.. i bought this car recently from a dealer for kbb value .. if take this car to a mechanic how much would i be charged?
1991 honda civic engine slows when headlights turned on?
Don't take it to a mechanic for that. The idle needle valve is just a bit far open or there is a small vacuum leak that is making the idle slightly above the correct cold idle setting, about 700 rpm. That prevents the Idle Air Control valve from doing anything - it stays closed - and the extra drag of the alternator when you turn the lights on slows the engine.



My money is on a vacuum leak, and the intake manifold gasket is top of the list. As long as you don't have more distressing symptoms (very high idle, idle %26quot;hunting%26quot;) there is really nothing worth doing with it.
1991 honda civic engine slows when headlights turned on?
Michael, I am having a different problem with the car and I have my question posted below, could you please let me know what could be causing the problem,



http://answers.yahoo.com/question/index;_ylt=ApjRzIXRhNlCrflrUMfCAQbty6IX;_ylv=3?qid=20100321050447AA1mpiE

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have u got the alternator tested as well as the battery?.
Get your alternator and battery tested, one of those could be on it's way out and unable to carry the electrical load it should.

The older Civic's tend to have a weird idle as more electrical accessories are used so it can also be a little normal.

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