Over the period of a a couple of month the idle on my G has been falling. Wanted to increae it using the screw behind de distributor before I take it for a tune up. Turned it both ways but it did nothing: it did not increase nor decrease rpm's. Is that the right screw?
Thanks
The idle adjustment needs to be done in conjunction with the mixture screw on the fuel distributor turn right to richen left to lean..
Checkout http://www.clubgwagen.com/gtech.php?pageTitle=tech%20article&sid=item&tid=17
Also check to see that your air filter is not very dirty.
The idle speed/mixture adjustment article in CGW shows a picture of the white plastic (large) screw near the distributor. It sounds to me like you're adjusting the proper screw.
You should NOT need to adjust idle mixture in order to see a change in RPM with even a small adjustment to that white plastic screw. That's the idle speed adjustment screw and turning it a little bit ought to change engine speed.
You say the idle has been decreasing. No disrespect, but, how do you know? The the tach in the cab, and the human ear are both unreliable for this measurement. Get a separate tach that hooks to the ignition coil and use it to measure the true engine RPM. Also leave that tack hooked up while you adjust the white screw.
I you have a reliable tach hooked up and one full turn either direction of the idle speed screw doesn't cause definite change in the readout on the independent tach, then you definitely have a problem.
A vacuum leak should cause RPMs to rise, not to fall as yours have, so I'd set that aside for a moment (not least because it's tough to check). Start with easy stuff like backing the idle speed screw out all the way and checking for damage. Also verify that the throttle plate is fully closing when your foot is off the gas (throttle plate propped open will diminish effect of idle speed screw). Start with those things and we'll go from there.
I had the same problem on my G yet sometimes it was high idle sometimes it was really low. Turns out it was the return spring on the gas petal. the spring was starting to break and was getting hung up at times (high revs) and was not getting hung up (low idle) I always start with the simple things so check the spring you you have the same sort of setup I do
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the 280 suffers from the term, "a whole lot of throttle linkage". The plastic bushes etc break and/or wear and people over look this which makes for very sloppy throttle. So sometimes it can catch and run high and the next run low. Make sure all your linkage is set up and replace any worn parts as well.
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Springs, linkage, damage, maladjustment, etc... these are the "causes" that produce the "effect" of throttle valve not closing completely, or for that matter reliably.
Simple stuff is always the best place to start![:)]
All right will check the easy stuff first. The engine quits if I don't keep some pressure on the gas pedal.
Will let you know how itr turns out.
Thanks
....The engine quits if I don't keep some pressure on the gas pedal.....
Sounds like maybe the idle bypass passage has become coked up and blocked. Pull that idle screw out first and make sure the passage beneath is clear to pass air around the throttle plate.
Other possibilities too, but start with the easy one.
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