finding vac leaks - tricks of the trade?

[JustenGT8]

Anyone got any advice handed down over the generations for finding tricky inlet manifold vac leaks. I have done the usual with a stethoscope and a tried a squeegy bottle along join etc with no joy.

Any dye or similar i can try and pressurise the system with?

[thechuckster]

spray start you bastard at potential leak spots with engine running - leak will manifest by increase in revs?

[JustenGT8]

while missing turbine housings

[thechuckster]

well if you did it in the dark, you'd know when you got the turbo

[WHITCHY]

Cant you use a spray of water? would just have the opposite effect to start ya bastard and won't burn ya car down!

-Whitchy-

[JustenGT8]

^^^ have done already with no joy

[WHITCHY]

Got a friend with a smoke machine? or friends that like to smoke bongs? blow some smoke into intake and see if it leaks out?

[ed]

i did the start you bastard technique with my vac leak - worked a treat

[oldcorollas]

close all valves and pressurise, and spray soapy water on potential leak spots

edit...plug exhaust pipe, plug intake around throttle body... pressurise slightly with compressed air line (into injector spot or sensor hole?) , spray soapy water and profit?

[tomvale13]

Got a friend with a smoke machine? or friends that like to smoke bongs? blow some smoke into intake and see if it leaks out?

I can provide said friends.

[thechuckster]

I can provide said friends.

are they south australian or from the northern rivers/murwillimbah region?

[LeeRoy]

Like Stu said. Get some pvc pipe with a screw on end like an inspection cover thing and then glue an air line fitting on the end. Put the pipe where your air filter is and then hook it up to the compressor and voila.

Its much better because you dont have the engine running so there should be no noise other than the hiss of an air leak.

[JustenGT8]

Like Stu said. Get some pvc pipe with a screw on end like an inspection cover thing and then glue an air line fitting on the end. Put the pipe where your air filter is and then hook it up to the compressor and voila.

Its much better because you dont have the engine running so there should be no noise other than the hiss of an air leak.

Yup that sounds like the best plan. Can wait until after WP

[fixeruperer]

just use carby cleaner or start u bastard i think thats easier, if the engine is dead cold the tubine housing wont be hot and the vac leaks might be a tad bigger as the metal hasnt expanded, you dont coat it just little squirts, you know wer the leak is becuase the engine will rev up a tad.

dont make a machine hehe.

[ChrisO_ke11]

Got yourself a barbie? If so take the bottle off (2kg work best due to the male fitting on the end) go find some garden hose about 2m or so, attach it to the bottle somehow turn it on and check for gas leaks. Then turn on the gas and go around the gaskets etc... engine rpm should increase and run smooth. But keep away from dizzy, leads or anyhing that produces a spark... Also can be used to start a car with a stuffed fuel pump carby or efi..