likaleica Posted July 11, 2015 Report Posted July 11, 2015 Once again I'm hoping you guys can help with a puzzling problem ! When I bought my car the original oil bath air filter was disconnected from the carb - and the mounting bar had been bent to stop the air filter knocking on the carb. I recently had the timing and carb tweaked by some very good old school mechanics - but they left the air cleaner disconnected, My engine runs very well with this set-up (though with a lot of induction noise), but when I reconnected the air fliter, I got spitting back in the carb and the engine stalled when I opened the throttle from idle. The only way I can stop this happening is to pull the choke out about 1/3 of its travel. This seems most odd - because surely refitting the filter would have the effect of richening the fuel/air mixture, not leaning it off ?? I am going to try flushing the filter in kerosene to make sure it isn't blocked and would welcome any tips as I've never had to do that on a car before. As always, all advice gratefully received ! Quote
greg g Posted July 11, 2015 Report Posted July 11, 2015 Having to artificially enrich the mix by using the choke usually suggests an air leak some where between the carb and the engine. Carb to manifold, manifold, manifold to block. the fault may also be in the idle circuit itself. A vacuum gauge attached tot he intake manifold would verify this condition, or suggest other areas to investigate depending on how it reads.Also check the vacuum line that powers the wiper if your car has vacuum drive for the windshield wipers. 1 Quote
likaleica Posted July 11, 2015 Author Report Posted July 11, 2015 Thanks Greg - I'll follow all that advice Quote
Solution garbagestate 44 Posted July 11, 2015 Solution Report Posted July 11, 2015 while your at it,check the carb throttle plate shaft opening for play.A while back, I rebuilt a carter ev1 and had to go through several throttle bodies in my collection of spares before I found one that wouldn't suck in air at idle. 1 Quote
likaleica Posted July 11, 2015 Author Report Posted July 11, 2015 Yes good suggestion - will check that too Quote
likaleica Posted July 11, 2015 Author Report Posted July 11, 2015 Garbagestate seems to have hit the nail on the head and thanks very much indeed to him! There was a lot of play on the throttle plate shaft. Since I have a wedding to do in the car next weekend there's no time to strip it all down so I've devised a cunning temporary fix. On the back of the carb the shaft protudes about 1/4" ouside the carb body. So I've forced on to the shaft 7 or 8 small PTFE "O" rings. This has provided something of a seal against air being drawn in. I can now get away with using no choke at all or just a little. I'll get the carb re-bushed at the machine shop after the wedding. BTW does anyone know how I can post an image on here ? When I follow the site help topics advice and hit the "green window" icon all it offers is a URL address - and what I need is to be able to browse my computer files for an image I've taken with my own camera. Quote
Andydodge Posted July 11, 2015 Report Posted July 11, 2015 Lika.......what I do is click on the reply icon below your post, it then goes to this "Reply to this topic" section with yours and the other posts above it...but on the lower right corner it has "More Reply Options"........I click on that and it goes to another screen "Post Preview" that has what I'm typing with "attach files and "Browse" in a little box..........I click on "browse" and my computer list of files shows, I click on "Pictures" and then "Andy's Pics" and choose whatever pic, click on it,"Open" and back on the "Attach files" thing on the Post Preview page and click on the "Attach This File" and its shown as a small pic on this page.....then after repeating the pic link if wanted I then press on the "Add Reply" at the bottom of the Post Preview page and there you go.......hope this helps......andyd 1 Quote
likaleica Posted July 13, 2015 Author Report Posted July 13, 2015 Thanks Andyd! BTW if I work out how to post images I'll put up some of those little windshield wiper buttons that hide behind the sun visors that we were discussing a while back. Cheers Quote
likaleica Posted July 13, 2015 Author Report Posted July 13, 2015 Here's a photo of the PTFE "O" rings I've used as a "get me home" fix on my Carter carb throttle spindle. I used two larger ones right up against the carb body, then wedged a series of smaller ones on to the shaft where it steps down to a smaller diameter. Obviosly this is only a temporary repair until the carb can be re-bushed. It may be useful for someone out there..... Quote
Andydodge Posted July 13, 2015 Report Posted July 13, 2015 YEH!!!!!!!!!...lol.....it worked.......lol.......btw are those O rings going to slow the throttle shaft return down, I mean will it make the accelerator stick?.......andyd Quote
Dave72dt Posted July 13, 2015 Report Posted July 13, 2015 why does that look more like a choke plate shaft than the throttle shaft? Isn't that the air cleaner clamp just above it? Quote
Sharps40 Posted July 13, 2015 Report Posted July 13, 2015 Because I'm 99.9% sure it is in fact the top of the carb and the choke plate shaft! I thought the same thing! Quote
likaleica Posted July 13, 2015 Author Report Posted July 13, 2015 Yes I wondered about that - but they don't so far. There's just enough friction to provide a reasonably effective seal but not enough to make it stick - fingers crossed! Quote
likaleica Posted July 13, 2015 Author Report Posted July 13, 2015 I'm still getting to grips with this unfamiliar car - and I'm no expert on whether it's the throttle or the choke shaft......you guys are almost certainly right...but the "O" rings have definitely improved things and the carb no longer gulps in loads of air! Quote
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