Re: Brake Booster & Stumble at Startup

[Kevin <kevin@domain.elided>]

Do you have the price and part number for the combo from Autozone?

Kurt McDowell wrote:

> George-
>     I had a hesitation problem at low rpm's when I put a load on my
> engine.
>  I fixed It by replacing the booster. BTW, at Auto Zone, a boster/master
> cylider combo
> was 50cents cheaper than just the boster.  a torn diaphram
> would also cause les than desirable power too the brakes.I'm not sure
> about
> the idle though, could just be cloged or mis adjusted idle jets. Does
> your engine
> diesel too? dieseling would be an indication of a lean condition wich
> could be caused
> be lack of vacume because of a torn diaphram.
>     Grant
>
> Date: Tue, 9 Mar 1999 01:10:52 -0800
> From: George Humphrey <gbhx@domain.elided>
> Subject: Brake Booster & Stumble at Startup
>
>         I've decided to run this theory by the think tank that is the
> ihc
> digest, to see if it makes sense. I've had a hard starting problem on
> the
> Scout for sometime now (pretty much since I bought it). When cold it
> starts, stumbles and maintains a very low idle or dies. If I can keep it
>
> running for maybe 30 second or so,  it will eventually idle better.
> After
> that it runs beautifully for the rest of the day.
>          My second problem is what I consider to be very marginal power
> brakes. I've never owned a car with power brakes before and am not sure
> how well they are supposed to work, But, I am guessing better than they
> do on my Scout.
>          Conclusion, I have a tear in the power booster diaphragm. My
> stumble at start up is caused by the vacuum to the power brake canister.
>
> It has to draw air from the entire canister, not just up to the
> diaphragm. Until the shell  holds the entire vacuum  my stumble
> persists.
> Eventually I'm left with a smooth idling engine with poor power brakes.
>           Does this make sense? I've tested the check valve and it is
> okay. I pumped and pumped and pumped on the vacuum canister but could
> not
> get a reading on the vacuum gauge. However, after driving for awhile,
> when I pull off the check valve there is some vacuum. Do Scouts have
> poor
> power brakes and my stumble is caused by something else? I know I should
>
> only attack one problem at a time but it is too late to work on my Scout
>
> tonight and my brain is working overtime. Thanks in advance for any
> responses.
>
> George H
> 72 Scout II
> 345

--
==================================================
Kevin and Lisa Curry <>< - Kevin@domain.elided
www.redhummer.net
"It's not a matter of no one else being able to keep up. It's a matter
of no one else being able to follow." -from my Hummer poster
==================================================