checking for vacuum/exhaust leaks techniques
#1
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checking for vacuum/exhaust leaks techniques
when checking for any exhaust or vacuum leaks, what are the best ways to pinpoint the culprits?
I seem to remember reading about spraying an aerosol or fluid and looking for bubbles or change in idle but I want to make sure. If there is a better way I'll follow that.
I'd like to find out the cause of the slight 'bucking' I am having on cold mornings until things warm up.
thanks
I seem to remember reading about spraying an aerosol or fluid and looking for bubbles or change in idle but I want to make sure. If there is a better way I'll follow that.
I'd like to find out the cause of the slight 'bucking' I am having on cold mornings until things warm up.
thanks
#2
You could up pinch off the hoses one by one where they enter the TB. If the idle goes up when you pinch off a certain hose, the leak is upstream of the pinch point of that hose.
The aerosol can idea goes like this; you spray an flammable evaporating aerosol (so the spray doesn't leave a mess) over the vacuum lines, if your idle jumps up a bit, the flammable spray found it's way into the intake via the leak.
The aerosol can idea goes like this; you spray an flammable evaporating aerosol (so the spray doesn't leave a mess) over the vacuum lines, if your idle jumps up a bit, the flammable spray found it's way into the intake via the leak.
#3
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use a unlit propane torch and wave it around slowly where u think a leak is. The engines vacuum will pull in the propane and make a change in the idle speed
#4
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wish I'd thought of that unlit propane torch idea for my truck.... if you spray the lines down, do small portions at a time, and use quick sprays. don't hose the whole thing down at once, you'll never figure out exactly where your leak might be
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