Quote:
Originally Posted by Kamakiri
Grab a spray bottle full of water and start misting around the plug wires and cap. If it's that, the engine will stumble worse. Then, grab a can of carb cleaner and spray around the intake, TBI, and vacuum hoses. If it's a vacuum leak, you'll hear a change in the way the motor runs.
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I've heard an unlit propane plumbing soldering torch will do the same thing with the added benefit of being easy on plastic and not leaving any flamable liquid on hot surfaces. If by some fluke the engine somehow lights your torch you have a small controlled flame rather than an engine soaked in a lit lake of flammable liquid.
I've yet to try it, but I plan to use that method to leak test the vacuum system on my Lincoln Mark V...First I'll let the air intake suck some of that propane in to confirm it changes the idle noticeably, then start looking for vac leaks....Once it gets warm.