Question about 1990 Toyota Pickup

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My 1991 toyota truck idles fine whe io pre ss the gas it will go up then down fine when i hit the brake it starts to race up then down when i let off the brake it quits?

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Rule out the brake booster diaphram, remove the vacum line to the booster and plug the hose up, handbrake on, start the engine, if it is ok then you have a split diaphram in the booster, see your local brake shop for a replacement.

Posted on May 03, 2009


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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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