Question about 1991 Toyota Pickup

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Idle surges after warm up and when brake pedal is pressed

1991 Toyota pickup 4cyl, 5spd, after complete warm up it idles a little high. Then when you step on the brake pedal the idle goes down and the engine surges up and down. I temporarily fixed the symptom by adding a return spring to the throttle.

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  • superfunk13 Feb 16, 2009

    I Thought it was the brake booster, but i disconnected the vacuum line and plugged it. I started the truck and with a warmed up engine and tried the brake peddle again. It didn't fix the problem, and I'm not sure what else would cause the surging when the brake peddle is depressed. Anybody have other ideas?

  • Anonymous Feb 21, 2009

    i have a 1990 pickup that used to surge when the brake pedal was depressed then it when away for about a month it just came back about a week ago now it does it just sitting at an ide speed with or without the peddal depressed ive checked everything new booster new check valve traced all vaccum lines and still have no clue

  • Anonymous Feb 25, 2009

    I had the same problem, It will be an electrical issue with the brake light switch. Check the light bulbs and the wiring under the bed. Or possible the brake light switch shorting out. I had this problem for months before I figured it out.

  • Phantom302 Apr 06, 2009



    i have a 1989 Toy 4cly pickup that surges when the brake pedal was depressed then it when away for about a month it came back about 9 week ago now it does it just sitting at an ide speed when it's cold 45 outside with or without the peddal depressed I've checked everything new booster new check valve traced all vaccum lines and still have no clue

  • joe dogg
    joe dogg Mar 10, 2014

    i had the same problem and thought it was a vacuum leak. i disconnected everything the same as you did and no change a friend changed the idle control vavle and that took care of the problem. try that

  • Anonymous Mar 26, 2014

    engine starts easily, has high idle.then surges between high and low idle. diagnosis code 12 shows in diagnosis, but runs normally at higher engine speeds

  • Anonymous Mar 28, 2014

    Engine surges at idle why?

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1990 22re same problem surge when pedal was depressed thought it was booster or check valve still didnt fix it i even put a brand new booster on it just to make sure still no fix it finnally went away on its own for about a month now it does it just sitting at an idle with out the brake pedal depressed traced all vaccum lines no problem there and still have no clue

Posted on Feb 21, 2009

  • Richard Voswinkel
    Richard Voswinkel Feb 20, 2014

    The problem went away when I put the truck into 4-wheel drive. A couple years ago a mechanic replaced the clutch, but didn't reconnect the light which comes on when in 4-wheel drive. Now the surging doesn't go away when I shift it into 4w drive. I'm wondering if there's a short between the 4w drive and an idle circuit. I'm going to try disconnecting the brake light connection at the pedal and see whether that makes a difference.

  • joe dogg
    joe dogg Mar 10, 2014

    idle control vavle most likely the problem

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You have a leak in one of your vacuum lines or circuits.

Posted on Jan 19, 2009

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


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I suspect what you have is a vacuum leak.

1. Try hunting down the leak with carb spray. Don't get too crazy with it, when you get to your leak it will change the way it runs. Also do not deliberatly spray this on spark plug wires as one stray spark and you will need a fire extinguisher. This method is safe, just use your head.

2. If you detect a leak at the brake booster, unplug the vacuum source line for it and plug it. Then trying running the truck again. If it runs normal the leak is in your booster and must be replaced.

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Will only start with pedal pressed then idle fine


Try a new throttle position sensor or clean the plug going to it.

Dec 03, 2009 | 1991 Toyota Pickup

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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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you could have a vacuum leak that is mimicking a throttle that is open further than it really is. Also could be timing that is too far advanced.

Feb 28, 2009 | 1991 Toyota Pickup

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