Date: Wed, 27 Jun 2012 10:45:21 -0700
Reply-To: neil n <musomuso@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: neil n <musomuso@GMAIL.COM>
Subject: Re: CO Adjusting Screw,
Throttle Valve Switch Test Light Video etc.
In-Reply-To: <4FEA8DA2.5020109@turbovans.com>
Content-Type: text/plain; charset=ISO-8859-1
A smoke tester makes sense. How hard would it be to rig something like that
up? I could take up smoking.... ;)
Seriously though, maybe using a cigarette, I could smoke test the throttle
body itself. The whistle at or near TB may simply be a normal sound heard
when valve starts to open. If time permits I'll make an audio recording of
the sound while driving. 3 images of throttle body wear starting here:
https://picasaweb.google.com/musomuso/New1988Westy#5758420004649108962
The whistle sound pointed me to the TB gasket. In hindsight though, it
likely wasn't leaking. Yes. I shouldn't assume; I didn't think to check the
work. Still. Those parts looked and felt fine before install and I know
they weren't installed crooked or cockeyed. Doing my best not to be a parts
changer. Like I cleaned and adjusted the AFM wiper to a new position image
of resistive track which in hindsight doesn't look too bad: Image (arrow
points to "worst wear"):
https://lh6.googleusercontent.com/-c5axVMck2Ks/T-tDy8qL_MI/AAAAAAAAF2o/Cly2OSeHmUk/s912/AFM%2520Board%2520Wear.jpg
and made decent make-shift, still leak free repair to the thermostat
housing (stripped bolt). Image:
https://lh6.googleusercontent.com/-8yb3_iDiS10/T8AqTZM0RKI/AAAAAAAAFyc/Vt21jxXffzw/s720/Thermostat%2520housing%2520fix%25202.jpgthough
in that case, installing a new housing wouldn't be "throwing parts
at it" < grin > For those that noticed, the notch was intended to fit
to shape of housing. Parts ended up in a slightly different position.
IIRC, the only "part swapper" item I've installed is the coolant sensor and
I'm doing my best to do repairs correctly with the right or better parts.
e.g new intake boots are are not the braided type.
Re: intake runners. They were pretty rusty.
image:
https://lh3.googleusercontent.com/-hA5uk82Sob0/T6VtDi3DUoI/AAAAAAAAFsc/eNnGHot6b7E/s720/1988%2520Westy%2520Rusty%2520Runners.jpg
Stripped and painted with POR and Hi Temp engine paint. Ends where boots
slip over received only 1 coat of POR. Can't see how any leaks would be at
the runners though I do appreciate the pointer to those as a possible
source.
The van runs consistently better but is still not right. Dang it. Testing
yesterday, when in deceleration mode, engine would feel like a dead weight,
but when coasting in 2nd gear, on level road, a surge then bucking starts
just above 1K RPM. Yes I know this is close to idle RPM but it should just
stall with a single "ka-chunk". Right? Thinking that wire from idle
stabilization module to junction at throttle valve switch might be
affecting the ECU, I disconnected the Idle Stabilization circuit at the
test "port". This made no difference aside from dropping the idle a little.
Some new "always replace" washers for the metal fuel line T have arrived so
a fuel pressure test is next. Not sure how or if a fuel pressure issue
would cause surging in deceleration mode though.
Ironically, I have yet to change the oil though it looks clean. No level
surface to work on.
Thanks for the help people.
Neil.
On Tue, Jun 26, 2012 at 9:35 PM, Scott Daniel - Turbovans <
scottdaniel@turbovans.com> wrote:
LOL !
> 'since new parts were installed' ..it *couldn't be those* ... !
>
> yes, that's an assumption. The exact opposite is true - if it's been
> touched or worked on, that is where to look first.
> Of course always confirm the success of any new work.
>
> Sure would be nice if you had another throttle body or two to try.
>
> One of my vans did that whistle thing. It was kinda fun actually. Lots of
> throttle, no whistle.
> Let off just right ..distinct whistle, and the engine cover did not have
> to be off. I think that was on the intake runners somewhere.
>
> I'm sure you must know about engine torque-induced air leaks..
> Say on decel the engine tilt pulls on the Air Intake Boot just right to
> create an air leak, and only under those conditions.
>
> Scott
> www.turbovans.com
>
> yeah, try not to be a 'parts changer' ..
> the ole term is 'throwing parts at it.' .....not a very smart way to
> approach vehicle repair and tuning.
>
>
On Tue, Jun 26, 2012 at 8:38 PM, Dennis Haynes <d23haynes57@hotmail.com>
wrote:
Smoke testers are real nice for finding vacuum and vapor line leaks.
>
--
Neil n
65 kb image Myford Ready For Assembly http://tinyurl.com/64sx4rp
'88 Slate Blue Westy to be named.
'81 VanaJetta 2.0 "Jaco" http://tubaneil.googlepages.com/
Vanagon VAG Gas I4/VR Swap Google Group:
http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines
