caibs Posted August 12, 2012 Report Share Posted August 12, 2012 hi guys have what i believe to be a weber dfv. had it going ok, but now its developed an issue where if you rev it, it will rev then the motor will stall when the revs settle. you can get it to idle by fiddling with the throttle, but then once you rev it again it will no doubt stall. any ideas? Quote Link to comment Share on other sites More sharing options...
GJM85 Posted August 12, 2012 Report Share Posted August 12, 2012 (edited) Sounds like a vacuum leak. When the throttle butterfly closes after a rev, the vacuum beneath the carb increases, which in turn draws fuel through the idle circuit. If you have a vacuum leak, the manifold vacuum is too low at idle to draw on the idle circuit and she stalls. Edited August 12, 2012 by GJM85 Quote Link to comment Share on other sites More sharing options...
caibs Posted August 12, 2012 Author Report Share Posted August 12, 2012 i checked for that with a can of degreaser and didnt find anything, but i'll grab a can of carby cleaner and double check tonight mate Quote Link to comment Share on other sites More sharing options...
altezzaclub Posted August 12, 2012 Report Share Posted August 12, 2012 Other ones to look at would be worn throttle shafts or worn throttle linkages holding the throttle plate open or not.. I've had it where it idles when you release the throtle slowly and it settles in one place, but if you drop the throttle off quickly it reverts to a slightly different place and kills the idle. Quote Link to comment Share on other sites More sharing options...
caibs Posted August 13, 2012 Author Report Share Posted August 13, 2012 definately not a vac leak. yeh altezza that sounds like my issue. mate has a dgv i might try my hand at rebuilding. gotta get this thing reliable again its doing my head in. Quote Link to comment Share on other sites More sharing options...
caibs Posted August 18, 2012 Author Report Share Posted August 18, 2012 chucked the old carb back on. its pretty amazing how much they choke the 4k up. better to be choked and running though i guess Quote Link to comment Share on other sites More sharing options...
altezzaclub Posted August 19, 2012 Report Share Posted August 19, 2012 chucked the old carb back on. its pretty amazing how much they choke the 4k up. Ah- that's good to know. It means the Weber definately does make a difference. Like my SUs, guys often do carbs/cam/exhaust all at once and I wouldn't know what just changing the carb did. Post up the solution when you find it- Quote Link to comment Share on other sites More sharing options...
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