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Jun 20, 2011 12:42:31 GMT
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Fuel Starvation? Since my exhaust manifold started blowing, engine starting running worse and worse to the point where kept stalling/missfiring. Had a manifold sorted, and a bracket welded to the front pipe & bolted to gearbox mount. Little improvement then, but still running rough and missfiring. That evening I was unable to start the car, would fire on occasion and splutter then cut out. With a little luck you could catch it just right and rev her, but then would stall. AA man had a fiddle with the carb, there are 4 screws visible at the top of the carb - he did something to these, not sure what though. It turned out the points weren't opening! Don't know how this happened but reset them and started up smoothly. Since then the car drives lovely, however will not rev past about...ooh I guess 4k? Both butterflies open and fuel is going through, will not rev any further. When driving, same thing though normally results in my headbutting the steering wheel Few weeks back there was no problems up until the manifold went. Been searching the web for a manual for the weber carb I have but cannot find anything. I have been searching "32/34 dmtl" (which I believe is correct?). My thoughts are the AA Man has altered a jet or something? Help please!! Attachments:
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Mk1 Astra
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Jun 20, 2011 12:44:02 GMT
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Know what...I've copied and pasted this from the Mk1oc forum - didn't realise none of you would know what I drive!!! ;D Mk1 Astra, 1300s. Oh and attachments to show which screws I mean - the centre four. Inside screw on the left has number 155 on it Attachments:
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Mk1 Astra
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Jun 20, 2011 12:44:24 GMT
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And inside screw on the right has 200 on it Attachments:
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Mk1 Astra
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Jun 20, 2011 13:33:18 GMT
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Ignition timing, maybe dirt or oil on the points, or a knackered condensor? That's the obvious thing to me, since he altered the points, but maybe just tightened the screws that hold the top of the carb on. I had a similar issue when I had a little oil on the points - above a certain engine speed (and/or thorttle position) it just lost the spark, so didn't make any power. One thing that occurs to me is that points closing up makes the exhaust of an engine MUCH hotter than it would otherwise be - which might have caused (or at least accelerated) the exhaust manifold's demise. This makes me think that the ignition is the root cause of the trouble. I'd replace the points and condensor (try to get the right ones as NOS from a reputable manufacturer - reproduction ones are awful), set the points gap with feeler gauges or dwell meter, and then set the ignition timing with a timing light. Do the points look like this?  (image stolen from Volksangyl's Polo thread) If so, original Bosch points are far superior to reproduction ones - not easy to find though. They were fitted to all sorts of stuff with bosch dizzies - VW beetles, Polos, Ford Fiestas, etc. Make sure that the points are clean, and that the cam of the dizzy has a smear of grease on it. I would imagine that it will run a LOT better after doing this. Adjustment screws on fixed choke carbs tend to alter the idle mixture only, so the AA man couldn't alter the high-speed fuelling without a stock of jets, which he wouldn't have. As you can see the chokes opening and fuel spraying I suspect that it's not the carb (although if the main jet was blocked you'd still get fuel sprayed from the accelerator jet). |
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Jun 20, 2011 14:12:31 GMT
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Excellent reply thank you very much dude!
Yep points just like them, replaced by myself some months ago, also replaced the condensor.
Will whip it all apart this week and clean it all up. I did find it difficult to gap the points correctly, holding them in place whilst trying to tighten the screw = hard!
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Mk1 Astra
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Jun 20, 2011 14:30:50 GMT
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Excellent reply thank you very much dude! Yep points just like them, replaced by myself some months ago, also replaced the condensor. Will whip it all apart this week and clean it all up. I did find it difficult to gap the points correctly, holding them in place whilst trying to tighten the screw = hard! Don't slacken the screw all the way - a little friction makes it harder to get the right gap, but it'll sit there until you tighten down the screw. BTW, replacing them a few months ago doesn't guarantee that they are working now - especially if they were produced recently. Some of the points and condensors I've come across were truly shocking in terms of quality. Ben711200's Fiesta had repro points and condensor on it, and it was barely running at all. Fit some NOS Bosch ones and it's nigh on perfect. You could actually feel the difference in quality - the fit and finish was so much better on the Bosch branded stuff, and the pivot of the points had no sideways movment at all. |
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Jun 20, 2011 14:39:00 GMT
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I don't actually know where these points came from, were in the car when bought!
Ok, well I will give my local motor a bell and see what they go! Many thanks
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Mk1 Astra
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Jun 20, 2011 17:17:41 GMT
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Ok I've checked some old boxes, looks like the points on there at the moment are manufactured by Intermotor. The rotor arm & cap are both intermotor too...
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Mk1 Astra
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Jun 20, 2011 17:24:06 GMT
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Intermotor stuff isn't great IME - I've gone through several Intermotor sets of points to one decent NOS set.
Personally, I'd set the points and timing up as best as possible for now, and hunt round for some NOS Bosch stuff. I think there's a set of Bosch points on ebay at present, although the only condensors seem to be repro ones.
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trigga
Part of things
Posts: 211
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Jun 20, 2011 17:25:03 GMT
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theyll be rubbish then i use to go through these like they were going out of fashion on my escort
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Jun 20, 2011 17:28:07 GMT
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Those "screws" are the jets on a weber carb! If the AA man got them mixed up it would explain the reluctance to rev.  Ignition advice is spot on though  |
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To get a standard A40 this low, you'd have to dig a hole to put it in |
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Jun 20, 2011 17:34:48 GMT
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Those "screws" are the jets on a weber carb! If the AA man got them mixed up it would explain the reluctance to rev. Thanks for clearing that up, Scary.  |
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Jun 20, 2011 17:38:57 GMT
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Great photo! Screws are the same as you have done there.
Ok so I'll keep the intermotor parts as a "get me home" stop gap!
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Mk1 Astra
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Jun 20, 2011 17:40:51 GMT
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Mk1 Astra
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Jun 20, 2011 17:42:12 GMT
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Picture's not mine - I googled for "weber carb jets" and stole it from clubGTi Try swapping the numbered jets (120 and 200) around, see if it makes a difference. If it doesn't you can always swap them back. |
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To get a standard A40 this low, you'd have to dig a hole to put it in |
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Jun 20, 2011 17:47:05 GMT
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Haha in that case, good steal!
The AA man did not remove them so I have dismissed them being at fault.
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Mk1 Astra
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Jun 20, 2011 17:53:27 GMT
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hrm. Don't do it then, if he didn't actually take them out they shouldn't be wrong (assuming the car drove alright before)
Go with the ignition stuff before touchhing the carb at all.
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To get a standard A40 this low, you'd have to dig a hole to put it in |
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Jun 20, 2011 17:55:44 GMT
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Yeah I jumped to that conclusion because it was the only thing I could think of that could have possibly changed.
A few other things to note in all this, is that the engine is running significantly cooler since AA played with the points. Car was driving fine before, slight missfire but ran fine
Also, to expand further on the manifold "going" - it was the join when it goes from 4 to 2, the gasket blew because the system wasn't hanging anywhere other than the back box! Back box is blowing a little too.
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Mk1 Astra
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Jun 20, 2011 18:04:17 GMT
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Ignition timing sounds most likely then. Incidentally, I had a 1300S mk1 astra years ago, I remember it being an absolute swine to keep running correctly, and it hated 95 octane unleaded. High compression engine designed for 98 octane iirc.
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To get a standard A40 this low, you'd have to dig a hole to put it in |
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Jun 20, 2011 18:06:05 GMT
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Lets hope she doesn't continue being a swine!! In all fairness, has been running fine for a good 6-8 months so I shouldn't complain!
98 octane you say...perhaps I should try a tank of that and see how it goes! I always fill up at sainburys - nectar points !
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Mk1 Astra
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