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93 toyota pickup idle goes up and down when i push brake

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Vacuum check valve is bad. it is located on the thumb-sized hose that attatches to the brake booster. good luck, hope this helps.

Posted on Nov 09, 2010

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Rough idle when applying brakes

if rough idle goes away after releasing brakes, suspect faulty vacuum brake booster check valve or booster

Feb 25, 2014 | 1990 Toyota Pickup

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93' toyota pickup 4wd 4 cylinders 22re, sputters when given throttle

Low fuel pressure can cause this or a clogged filter, has the fuel pressure been checked? Has the fuel filter ever been changed?

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When car is idling with AC on and power brakes applied, the idle goes back & forth between fast & slow. The AC Up Idle VSV and the Idle Up valve itself are both working. The brake booster check...

Check another vac source in/around engine. When you load engine with brake booster, then lower vac pressure w/Up idle, it's amplifying another vac source that might be weak.

Mar 10, 2011 | 1994 Toyota Pickup

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Idols fast,when holding brake idols up and down up/down ...when lets off brake it quits...i checked throttle sensor replace it still the same

I'd look for a vacuum leak, possibly the large hose that goes to the brake booster-use a can of throttle body cleaner and spray around hose areas while engine is running and listen of drops in idle-there's your leak.

Dec 30, 2010 | 1994 Toyota Pickup

2 Answers

1991 toyota

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.

Feb 03, 2010 | 1991 Toyota Pickup

1 Answer

Check engine light is on, engine runs rough(idle is fine),

Check or have engine tuned up.
Spark plug wires + spark plugs. Or/and take it to Autozone, and they'll run a check engine light scan for you, for FREE !!

Jun 24, 2009 | 1993 Toyota Pickup

2 Answers

Idle surges after warm up and when brake pedal is pressed

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

Jan 19, 2009 | 1991 Toyota Pickup

1 Answer

1994 Toyota Pickup 4 cylinder 22 re

throtle postion sensor is going bad located on the front of the intake manifold

Jul 16, 2008 | 1994 Toyota Pickup

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