Should the engine be idling, or what, when measuring vacuum? Could be
doing this wrong.
--

Mike "Rocket J Squirrel" Elliott
71 Type 2: the Wonderbus
84 Westfalia: Mellow Yellow ("The Electrical Banana")
74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
KG6RCR

On 10/24/2007 4:34 PM Mark Drillock wrote:

> I would use the vacuum line to the fuel pressure regulator.
>
> Mark
>
> Mike "Rocket J Squirrel" Elliott wrote:
>
>> Hi, I'm looking for leaks in the intake manifold. Bentley's doesn't give
>> a procedure for checking intake manifold vacuum so I'm winging it. I let
>> the engine warm up so that aux air regulator thing is closed, and then I
>>  pulled one of the hoses going to the vacuum unit on the dizzie and
>> connected it to my fine Harbor Freight vacuum gauge.
>>
>> This is a 1.9L engine and the hose I'm using is the hose labeled "2" on
>> the left hand photo on page 24.25 in Bentleys.I don't know how
>> appropriate this hose is, but it has fewer bits connected to it than the
>> other one. There's also a hose going to the fuel pressure regulator,
>> maybe it's a better choice?
>>
>> ANYWAYS, when the hose is disconnected from the vacuum unit, the idle
>> hunts up and down. The vacuum gauge shows around 18psi -- depending on
>> engine rpms. I can open the throttle and the vacuum might drop to 10psi,
>> then climb back up . . . I really have no idea how one goes about
>> measuring vacuum.
>>
>> --
>>
>> Mike "Rocket J Squirrel" Elliott
>> 71 Type 2: the Wonderbus
>> 84 Westfalia: Mellow Yellow ("The Electrical Banana")
>> 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
>> KG6RCR
>>
>