Nah, do it the easy way. Seriously, hook up a propane torch but leave it
turned off, then start the truck. Blow the propane into everywhere you think
there might be a leak. When you find a leak, the engine will run a little
bit better.
Don't do it too long, and be in a well-ventilated location.
--
Ted Timmons Web Administrator
tedt@colubs.com JAPH
(360)256-7358 or (888)282-8400 ext. 273
If you can't convince them, confuse them.
> -----Original Message-----
> From: owner-oletrucks@autox.team.net
> [mailto:owner-oletrucks@autox.team.net]On Behalf Of Jeremy Eastman
> Sent: Tuesday, April 20, 1999 10:33 AM
> To: oletrucks-digest@autox.team.net
> Subject: [oletrucks] Finding Intake Manifold Leaks
>
>
> Since I dropped the rebuilt head on my 235, I've had some performance
> problems, most of which went away with some good valve-timing
> adjustment, &
> some good advice on manifold gasket leaks from members helped- (I
> opted out
> of shaving everything true and just went with the copper manifold sealant
> on all manifold gasket joints).
>
> What's still happening is a real noticeable stumble under fast
> acceleration, especially under load. I'm not really sure that
> I've got the
> manifold leak thing knocked yet, can't rule out fuel/air mixture, knocked
> up carb, etc.
>
> Searching the web during lunch, I came across a good method of testing for
> intake vacuum leaks.. with the engine off, injecting the manifold with
> smoke through a spare vacuum hose (I'm using my now-obsolete wiper vacum
> hose for my under-dash vacuum gauge, and I'll use this to inject whatever
> smoke I can come up with). The article I found
> (http://www.asashop.org/autoinc/may/TECH2TEC.HTM) mentions a certain tool
> called the VacuTec, which exists to inject thick smoke into the engine.
>
> Figured I'd share the tip with the group, and see if anybody knows of a
> good way/thingamajig to get alotta thick smoke into that vaccum hose. I'm
> gonna start off with a pack of Camels..
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
>
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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