The best way to check for vacuum leaks would be to use an aerosol carb cleaner or gumout spray. With engine running, spray near suspected vacuum leakages area and id the engine idling speed changes, there should be a leak.
OBD-II is more accurate and precises in their diagnostics. Pre OBD-II only tell you something is wrong but is not precise. Most codes would show as one but for OBD-II, it would show you lean or rich if it is anything to do with running conditions.
Friday, February 11th, 2011 AT 8:36 PM