Question about 1998 Chevrolet Blazer

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When applying the brakes the idle surges - 1998 Chevrolet Blazer

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The brakes some- what run with the vacum in your car. If your A/C doesnt work than it means that you have a Vacum leak somewhere.

Posted on Apr 24, 2010

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Why does a 94 v-8 limited vehicle have acceleration surges.this happens with acceleration or with brake applied just after using accelerator.this does not happen at idle or in neutral. why does this h


Surges are usually from dirty throttle body's, idle air control motors, or airfilters. I would clean or replace these first. Other things could be O2 sensors, or bad catalytic converters.

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1999 Ford Taurus SE has idling problems


These cars are notorious for throttle position sensors...I would start there first. They also tend to have problems with the EGR Valves which would also cause a surging affect such as sitting at a light or when applying the brakes!

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1994 22re engine surging idle when brakes applied cause?


Check for a vacuum leak in the vacuum assist diaphragm. A leak can allow far too much air into the intake manifold, causing an increase in engine speed.

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My 1989 22re idle surges when warmed up and brake pedal applied. let off the brake it stops surging


Check the vacuum hose from the engine to the power brake vacuum reservoir, it make be loose or cracked and will cause an erratic idle because of the vacuum leak. Please rate this answer, thanks.

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I have a 2004 2500 hd silverado with duramax engine. the vehicle intermidentaly lunges with air conditioning on and brake applied.


It sounds like the computer is compensating the idle when the a/c compressor cycles on. The compressor cycles on and off when the a/c is on, which is normal. When the compressor kicks on, it puts an additional load on the engine, which in turn lowers the idle, especially at idle sitting at, say, a red light. Having the brakes on also adds another load to the engine as it uses a lot of engine vacuum to keep the brakes applied. When the engine surges, like your describing, that is the trucks computer sensing the additional load put on the engine, and is adjusting the idle higher to compensate for it. Theres really not a lot you can do about it, unless maybe switch off the a/c at red lights. I should add that if it's a severe "lunge" or surge, enough that your fighting to keep the truck from moving, I would check for maybe a vacuum leak, or even possibly take the truck to a dealer and have it checked over. Hope this helps.

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Surge in idle when brakes applied or after driving..


block off vacuum hose to brake booster and see if idle returns to normal if it does you need new brake booster has hole in diaphram internally some times slight hissing noise is evident in cab when pressing brake pedal to section where engine surges or idles high. also check for fuel leaks from hoses if you can smell fuel in engine bay while running and engine warm some leaks only leak while running and hot

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Rough idle / engine surges until power is applied


Sounds like a possible vaccume hose leak?

Feb 07, 2009 | 1997 Chevrolet Astro

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Idle speed


This is because the computer compensates idle for when the A/C compressor is on or off. When the A/C compressor kicks in the computer will increase the engine idle to compensate for the drag in from the compressor. When the A/C is off it will decrease the idle to try and maintain a steady idle. If it is causing a high surge when the brakes are on it may be the IAC valve. If it is just slight it shouldnt be anything to worry about.

- Tech101

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