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most vacuum leaks are in hoses that are disconnected or have holes in them you can also take a bottle of water and spray it along the side of the intake and base of the carborater if the motor bogs or you here it suck the water in you have found you leak but it can be a leak under the intake and that is a bigger problem to find buy a can of starting fluid and spray it near the gasket and vacuum hoses and if the engine increases its rpm that is where the leak is

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โˆ™ 2015-07-15 18:24:42
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Q: How can you find a vacuum leak in a race engine?
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The year, make, model and engine info would help but a serious vacuum leak could do that.


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The racing up and down at idle is call enging loping, usually caused by a vacuum leak. It could also be caused by a sticking choke at the carb. Whatever the case may be, you will need to start by hooking up a smoke machine to find the source of the leak. Also check your coolant level. my 1991 Toyota 4x4 22re had the same race up and down idle. it was a low coolant level.


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