CRC, Carb Cleaner, water dishwashing detergent all work if you spray it around. An unlit butane/propane torch also works particularly where it to a spot that you can't reach with a liguid spray but be prepared for some backfiring into the inlet manifold and remember it can light up. Spray the stuff pipe by pipe and listen for a change to see hwere it's leakinh though if it's a big leak you'll alos see the fluids being sucked in. You can also buy an expensive detector that can sense the frequency that the air being sucked in makes; big $ item though. Sometimes you may also hear it with a mechanics stephoscope or broomhandle used as same.
PS Use a hand spray bottle for the water or detergent etc, Sparey a little in the air inlet (after the filter) 1st to see what the change in revs will sound like.
When I said vaccum leak I was referring more to those stupid little black hoses that run everywhere to those funny little vacuum switches on the thermostat housing and intake manifold, amongst other places. There is quite a few of them - the little hoses go everywhere, but only a few of them can actually affect the engine's running characteristics if one is disconnected or is connected to the wrong place:crazy1:
It could also be an EGR valve, looks like a little flying saucer and is usually attached to the intake manifold somewhere and has one of those stupid black hoses going to it.
Best bet I reckon is to take it to Dyno Tune or something where the mechanics are reputable and experienced on all makes and models, and might have half a clue.
There are only 2 states to be in:
Western Australia, and pissed.
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