Quote:
Originally Posted by jhirasak
"......If it still exists after you have gotten to the smallest size of idle jet holder, I would look to add the 3rd progression
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Additionally I'd be trying some richer emulsion tubes before breaking out the drills.
Re. The issue of a couple of cylinders not responding to the idle mixture screw being turned completely closed:
This is often just a matter of the throttle plates not in alignment and the throttle shaft needs a little tweek to set matters right. however, from the description of when the drivability issue happens, this misalignment, and only idling on 6 cylinders has nothing to do with the stated problem. Of course if there is some blockage, that's different. But with a minor throttle plate difference that causes a cylinder not to idle, the engine does just fine once the throttle is opened slightly.
Quote:
Originally Posted by saltshaker
"........ I would think the benefit of the etube would come in much later. Other possibility is timing issue....or twisted throttle shaft on one carb. 4 centered barrels are sync'd
Jon
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I'm doubting timing has anything to do with this. As far as one of the throttle plates lagging behind its mate, check the sync on ALL eight holes. If the dead ones are pulling much less vacuum than the others, you definitely have a little throttle shaft tweeting to do. It takes very little pressure to set things right if that's the case.
In my limited experience, changing an emulsin tube can make a huge difference when the throttle is barely open, just as it can when the throttle is more open.
Z.