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Old April 18th 06, 04:43 PM posted to rec.autos.tech
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Default Idle RPM sensitivity to signalling?


Aaron407 wrote:
> I have a 95 Grand Prix GTP, and if I'm signalling at idle (in gear, my
> foot on the brakeat a dead stop) my RPM decreases by about 50 RPM when
> the signal light is lit and cycles back up when it turns off and
> continues during the periodicity of the signalling. My dash lights also
> slightly dim with the same trend. My question is, is this normal?
> Should the engine idle and interior accessory lights really be this
> sensitive to such a small electrical draw? I have checked my battery at
> idle and it's charging at 13.8V, and I haven't had any other electrical
> problems. However, I do have some other erratic idling when not
> signalling, so if this could all be attributed to the same electrical
> problem I'd love to figure it out. Thanks.
>
> 407


Do you mean that the directional signals cause the idle to drop, or
that the brake lights cause the idle to drop? if the latter I would
actually suspect a vacuum leak in the brake booster.

nate

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