How do I find a vacuum leak?

  • Thread starter Thread starter blurp
  • Start date Start date
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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
 
blurp said:
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
Click to expand...

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.)
 
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.
Click to expand...
 
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