LOW IDLE AT BRAKING

1991 Honda Civic

Tiny

sparrky

April, 4, 2010 AT 11:33 PM

Brakes problem
1991 Honda Civic 4 cyl Front Wheel Drive Manual 40,000 miles

got a 91 honda civic hatch si
when I hold my brakes on the car goes to a really low idle about 500 if I let off it slowly goes right back to around 1000 I checked the booster and its not it, tottaly stumped, any help would be great.

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6 Answers

Tiny

legitimate007

April, 5, 2010 AT 3:46 PM

I believe your problem is the idle air control valve.

Tiny

sparrky

April, 5, 2010 AT 4:29 PM

Wouldent my check engine light be on if it was bad and is there a way to test it before I just buy a new one thanks.

Tiny

legitimate007

April, 6, 2010 AT 7:02 AM

That is a common misconception, won't necessarily happen, could just be dirty. To test it your gonna take it out of its bore, you should clean the bore and throttle body while your at it. Once you remove it your gonna have someone turn the key to the on position then you should see the pintle of the iac 'step' in and out at different lengths. If it doesn't do this then its no good

Tiny

sparrky

April, 6, 2010 AT 4:17 PM

Replaced it cause I had another one around still doing the same thing any other ideas do u think this could be electrcal maybe altenator or something im lost thanks for all ur help.

Tiny

legitimate007

April, 6, 2010 AT 4:19 PM

Check the egr valve and mapp sensor. Also check fuel pressure.

Tiny

legitimate007

April, 6, 2010 AT 4:20 PM

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