In a message dated 3/13/00 3:16:55 PM Eastern Standard Time,
dtjon@hotmail.com writes:
<< Anyway, I put the points back in and get the same results. When you close
off the butterflies it runs steadily. This would indicate a vacuum leak to
me, but when spraying some starter fluid around the manifold, the carb base
gasket, etc. there's no change in the way the engine runs.
I have the mixture screw to 1 turn out (as per my Haynes Weber manual). Any
ideas? >>
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I'm certainly no carb expert, but I do have some Weber DGV manuals digitized
on my computer. I can e-mail them to you (or anyone ealse) if you think it
would help.
One doc is actually scanned images of the DGV manual, and it is difficult to
successfully transfer by e-mail. I usually end up sending each image by
separate e-mail messages, because of the difficulties of teaching .mim and
.zip compression usage. If you want it, I'll send it, no problem.
The other doc is on setting the idle, and is below. I just retyped it from
the original Weber doc. I hope it helps.
Allen Hefner
SCCA Philly Region Rally Steward
'77 Midget
'92 Mitsubishi Expo LRV Sport
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Weber DGV/DGAV Idle Setting Procedure
Note: Before adjusting carburetor, be sure engine is at operating
temperature, (choke fully off) air cleaner is removed and vacuum lines are
plugged off.
1. The Weber DGV/DGAV idle speed screw should be adjusted to its preliminary
set point before adjusting the idle mixture. To set the idle speed screw,
follow these steps.
2. Back "out" the idle speed screw until the tip of the screw no longer
touches the throttle lever. Then slowly turn the screw in until it just
comes in contact with the throttle lever.
3. From the "contact" position, turn the idle screw "in" one (1) full turn.
4. If a tachometer is available, install it prior to starting the engine. If
a tachometer is not available set idle mixture "by ear."
5. Start engine, be sure choke is not engaged, and proceed to adjust the idle
mixture.
6. Turn the idle mixture screw "in" (clockwise) until the engine RPM begins
to fluctuate on the tachometer. (If adjusting by ear, until a noticeable
drop in speed is heard.)
7. Back "out" (counterclockwise) the idle mixture screw slowly, until the
engine idle becomes steady. Try to obtain the leanest setting without
affecting the idle speed. If necessary, repeat steps 6 and 7 until the best
setting is achieved.
8. Once the mixture is set, fine-tune the engine's idle speed, if necessary,
by readjusting the idle speed screw. (Note: Turning "in" (clockwise) the
idle speed screw will increase engine speed. Turning "out"
(counterclockwise) the idle speed screw will decrease the engine speed.)
9. If idle speed is reset go back and repeat steps 6 and 7.
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