Idle decreases when wheel turns???

[roundbox52]

This one is a little odd to me.... I was stopped at a red light with my brake depressed and the engine was idling around 800rpm. I turned the wheel maybe 90 degrees and the idle went down to around 550-600rpm just for a second then went to 900rpm for two seconds or so and back down to 800rpm. Any ideas why???? I'm clueless on this on.

Thanks.

 

[benner]

This one is a little odd to me.... I was stopped at a red light with my brake depressed and the engine was idling around 800rpm. I turned the wheel maybe 90 degrees and the idle went down to around 550-600rpm just for a second then went to 900rpm for two seconds or so and back down to 800rpm. Any ideas why???? I'm clueless on this on.

Thanks.

LOL you've evidently never paid attention to other vehicles have you. Power steering uses the engine to turn the power steering pump so when you turn the wheels while stopped it takes a tiny bit more power to turn them with the extra friction.

My old Formula dyno'd 373rwhp and still decreased idle when I'd turn the wheels while at a stop.



It's completely normal.

Also ever paid attention to your idle when you turn the A/C on? Exact same thing.

 

[01gpgt01]

x2 its normal

 

[roundbox52]

Nope - Never paid attention!!!! I'm not a car guy really - just a do it yourselfer and find this forum and users like you two great assets.

Thanks!

 

[benner]

no prob. I can see where it would be worrying if u werent aware of whats happening

 

[matt5112]

try holding all the window buttons in the "up" position at the same time and watch your lights and engine speed.

same deal. Basically if any pulley puts more load on the engine, the engine speed lowers.

except the a/c compressor.... the computer generally raises the idle when the ac compressor is running.