How do I find a vacuum leak?

[blurp]

I believe I have correctly diagnosed my latest problem as the result
of a vacuum leak...now how do I find out where it's leaking?

My car is a 1983 240 Turbo with the Bosch injection system (CiS I
believe).

So any suggestions on how this can be done? Someone told me a smoke
machine was a common way but a) I don't have one and b) so what if I
did, how would I use it?

Thanks for any suggestions.

blurp

 

[Mike F]

I believe I have correctly diagnosed my latest problem as the result
of a vacuum leak...now how do I find out where it's leaking?

My car is a 1983 240 Turbo with the Bosch injection system (CiS I
believe).

So any suggestions on how this can be done? Someone told me a smoke
machine was a common way but a) I don't have one and b) so what if I
did, how would I use it?

Thanks for any suggestions.

blurp

A smoke machine forces smoke under pressure into the intake manifold.
When you see where it leaks out, you've found your leak. Spraying any
fluid out of a spray bottle (WD 40, water, whatever) will change the
idle when you're hitting the leak. On a 240 Turbo, the injector seals
are a good place to start. Any leak anywhere from the air flow meter,
turbo, intercooler, intake manifold through to the injectors will cause
a problem. There are 1 or 2 hoses (2 if intercooled) stuck through
holes in the cast aluminum pipe that is inbetween the air flow meter and
turbo that often fall or get pulled out.

--
Mike F.
Thornhill (near Toronto), Ont.

NOTE: new address!!
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)

 

[blurp]

Thanks Mike! I'll check it out today.

A smoke machine forces smoke under pressure into the intake manifold.
When you see where it leaks out, you've found your leak. Spraying any
fluid out of a spray bottle (WD 40, water, whatever) will change the
idle when you're hitting the leak. On a 240 Turbo, the injector seals
are a good place to start. Any leak anywhere from the air flow meter,
turbo, intercooler, intake manifold through to the injectors will cause
a problem. There are 1 or 2 hoses (2 if intercooled) stuck through
holes in the cast aluminum pipe that is inbetween the air flow meter and
turbo that often fall or get pulled out.