Mike
Part of things
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Right last year i managed to bag myself a retro mgb which came with a load of tidy bits in the boot. happened to find an accuspark electronic ignition kit in there aswell. so first thing i do is get this baby in there. All wired up as diagram and she starts and runs amazing! perfect!! for about two days  as I'm driving down the road the engine just cuts out and will not kcik back in again, then she leaves me swearing at the side road side with the hazards on. Check for spark. no spark..must be faulty uni off back to accuspark she goes  new unit did exactly the same thing so sent that back got a new one but left it in the boot as a get me home measure if i needed it. had the wise idea of trying it again anyway about a week ago and as before runs absolutly amazing with it in however it failed exactly the saem as before checked wiring and all is as it should be had a few mates look over aswell all seems good. the guys who had me before was a bit of a rally enthusiast hence decided to rewire his own toggle switches in all over the dash and make a hel of a mess of the wiring. is there anything this couldbe related to? at the moment the car is running like a bag of spanners so would just love to be able to get this to work. has anyone had problems with accuspark units before or can anyone recomend a replacement system? not amazing at english not the best mechanic in the world either so sorry in advance for any mistakes |
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Mike
Part of things
Posts: 352
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any help would be greatly apreciated
thanks
mike
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bortaf
Posted a lot
Posts: 4,549
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Is it ment to run on a ballested 9V but the old owner has removed the ballest and it's running 12V ??
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R.I.P photobucket
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Seth
South East
MorrisOxford TriumphMirald HillmanMinx BorgwardIsabellaCombi
Posts: 15,516
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Have you tried running/driving it about with points and condensor in?
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Follow your dreams or you might as well be a vegetable. |
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Mike
Part of things
Posts: 352
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Nov 22, 2011 11:41:10 GMT
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I dunno about the coil will have to check didnt think of that cheers bortaf and yeah iv run it on the point for the last ear but it doesnt like it the car wont start with the points gap set normal it has to be open stupidly wide maybe thats a clue i don't know
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Nov 22, 2011 13:16:53 GMT
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^ In that case the ignition timing needs resetting (advancing - wider gap advances the timing) when you set the points to a standard gap - I guess that the accuspark times in a bit differently to the points.
As to why the Accuspark keeps dying, it might be to do with the coil fitted (if it's a high performance part the high current might be overwhelming the transistors), the plug leads/rotor arm (any open circuit will cause voltage spike which could again kill the transistors). Alternatively, it might just be getting too hot - there's not much airflow around the MGB's dizzy.
IIRC, the Accuspark has a built-in rotor arm - could it be that failing? Did you check the spark at the king lead (from the coil to the dizzy), or just at the plugs? When the Accuspark fails, does the rev counter do anything when you turn it over (if not then the LT side of the coil isn't being triggered).
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ChasR
RR Helper
motivation
Posts: 10,195
Club RR Member Number: 170
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Nov 23, 2011 13:14:19 GMT
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If it is a chrome bumper MGB then it should not have a ballast resistor. Judging by the fact that he is talking about a 25D4 I shall assume it is a chrome bumper car he has (what year is a the car?). What voltage do you get at the coil terminals with the ignition on and engine off (don't leave it on for too long!), and what coil is fitted? I would be tempted to go along with JRevillug's theory of it possible being on the wrong coil (when I used a similar system on my MGB (The Britpart kit) it stated quite clearly to use only a stock coil. My car worked very well on the Britpart system. Timing would also cause issues (I had to reset it on my car after fitting the kit). The wiring could also be causing your issues but this is something either you will have to restore or someone who is electrically minded if you do not feel up to the task  . I would be tempted to try and fit your points back on but with the assistance of a dwell meter so as to set the points correctly (cam wear can throw off the feeler gauge adjustment more than you think). If you were closer I may have been willing to have helped you there with my meter. Finally it could be your coil. I had a similar issue on my Stag (well, when it got to 3.5krpm (somedays it was 2.5k!) it would stumble and pop a little from the exhausts, willing to rev no more, yet with a very gentle throttle held in gear it was OK. With the old Bosch Super Red coil reinstated it runs very sweetly indeed. For the record, the old coil was a black 12V ballast coil made by County and my Stag runs on a Newtronic ignition system. |
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Last Edit: Nov 23, 2011 13:34:56 GMT by ChasR
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djefk
Part of things
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I've had the same prob with this system in a princess (45D dizzy but similar enough) - had me stumped for ages:
Check that the magnetic collar hasn't moved on the dizzy shaft. They're often a touch loose. Take it off and reinstall it and see if it then sparks / runs. If so you need to find a way of increasing the interference fit of the collar to the shaft.
Let us know how you get on.
As an aside, I fitted an Accuspark to my old Allegro along with a Lucas Gold sports coil and new cap, 8mm silicone leads, NGK plugs- I did 6k miles in it with no problems (but noticeably better starting, smoothness and economy) for 18 months before I sold the car: it's an amazing low cost setup once the bugs have been ironed out.
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Last Edit: Nov 29, 2011 3:38:55 GMT by djefk
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djefk
Part of things
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I've had the same prob with this system in a princess (45D dizzy but similar enough) - had me stumped for ages before I realised what was happening- it was doing exact what you describe with your MGB!! : Check that the magnetic collar hasn't moved on the dizzy shaft. They're often a touch loose. Take it off and reinstall it and see if it then sparks / runs. If so you need to find a way of increasing the interference fit of the collar to the shaft. Let us know how you get on. As an aside, I also subsequently fitted an Accuspark to my old Allegro along with a Lucas Gold sports coil and new cap, 8mm silicone leads, NGK plugs- I did 6k miles in it with no problems (but noticeably better starting, smoothness and economy) for 18 months before I sold the car: it's an amazing low cost setup once the bugs have been ironed out. |
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Mike
Part of things
Posts: 352
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cheers for all the responses guys sorry I'm just getting back to this. the cars still running like a bag of spanners. cant tell what coil it is what is the difference between ballasted and non ballasted coils? i will check what voltage is coming threw the coil tomorow morning aswell, also i will check the rotor arm thank you there was no spark from the king lead with the accuspark system in which i could not understand at all..but seriously this car is like a maze of wires! i tried the dwell metre on it and it goes crazy just kicks out random numbers yet works fine on the other 3 cars on the drive :S so set it up with the points gap and timing as the haynes manual says and the bi@tch wont even start! really fustrating! I'm going to order a new coil and electronic distributor with new leads and plugs from accuspark on payday i think and keep the fingures crossed. seriously thanks for all the help tho guys really apreciate it top site definatly worth signing up to |
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as I'm driving down the road the engine just cuts out and will not kcik back in again, then she leaves me swearing at the side road side with the hazards on. Check for spark. no spark..must be faulty uni off back to accuspark she goes 
new unit did exactly the same thing so sent that back got a new one but left it in the boot as a get me home measure if i needed it. had the wise idea of trying it again anyway about a week ago and as before runs absolutly amazing with it in however it failed exactly the saem as before checked wiring and all is as it should be had a few mates look over aswell all seems good. the guys who had me before was a bit of a rally enthusiast hence decided to rewire his own toggle switches in all over the dash and make a hel of a mess of the wiring. is there anything this couldbe related to?
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