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Electronic ignition dizzy question
I am looking at a '70 beetle. It has a vacuum advance dizzy with
electronic ignition which I am not familiar with instead of points and condensor. I can't tell the make. While checking the advance with the homemade Muir lamp I noticed it stayed lit dimly all the way around the clock until it got to about 7.5 and then lit up fully. Is this normal for electric ignitions? The engine takes takes about 6 seconds to catch although all the tune up settings are good. It idles fine but has an intermittent miss at speed. David |
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#3
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Electronic ignition dizzy question
On Aug 28, 4:30?pm, Speedy Jim > wrote:
> wrote: > > I am looking at a '70 beetle. It has a vacuum advance dizzy with > > electronic ignition which I am not familiar with instead of points and > > condensor. I can't tell the make. While checking the advance with > > the homemade Muir lamp I noticed it stayed lit dimly all the way > > around the clock until it got to about 7.5 and then lit up fully. Is > > this normal for electric ignitions? > > > The engine takes takes about 6 seconds to catch although all the tune > > up settings are good. It idles fine but has an intermittent miss at > > speed. > > > David > > That's probably normal leakage thru the electronics. > > The long cranking may have nothing to do with the spark; > more likely slight flooding. > > If the miss occurs at odd times under load, inspect every > push-on terminal in the Coil circuit for looseness. > Then check the distributor advance plate for the tiny > braided pigtail lead. If broken, the pigtail won't > provide proper grounding as the advance plate rotates. > > Speedy Jimhttp://www.nls.net/mp/volks/ Thanks so much! I'll check those items tomorrow. The mosquitos were too fierce this evening. David |
#4
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Electronic ignition dizzy question
When semiconductors fail (particularly in a stressed circuit like ignitions)
they do so catastrophically and either go completely short circuit or open circuit. There is no half way. Obviously the output transistor is working as you noticed the lamp come on at 7.5. The circuitry does take a little current to work so its almost certainly as the Speedy suggests. John > wrote in message ups.com... > On Aug 28, 4:30?pm, Speedy Jim > wrote: >> wrote: >> > I am looking at a '70 beetle. It has a vacuum advance dizzy with >> > electronic ignition which I am not familiar with instead of points and >> > condensor. I can't tell the make. While checking the advance with >> > the homemade Muir lamp I noticed it stayed lit dimly all the way >> > around the clock until it got to about 7.5 and then lit up fully. Is >> > this normal for electric ignitions? >> >> > The engine takes takes about 6 seconds to catch although all the tune >> > up settings are good. It idles fine but has an intermittent miss at >> > speed. >> >> > David >> >> That's probably normal leakage thru the electronics. >> >> The long cranking may have nothing to do with the spark; >> more likely slight flooding. >> >> If the miss occurs at odd times under load, inspect every >> push-on terminal in the Coil circuit for looseness. >> Then check the distributor advance plate for the tiny >> braided pigtail lead. If broken, the pigtail won't >> provide proper grounding as the advance plate rotates. >> >> Speedy Jimhttp://www.nls.net/mp/volks/ > > Thanks so much! I'll check those items tomorrow. The mosquitos were > too fierce this evening. > David > |
#5
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Electronic ignition dizzy question
On Aug 29, 6:03?am, "John" > wrote:
> When semiconductors fail (particularly in a stressed circuit like ignitions) > they do so catastrophically > and either go completely short circuit or open circuit. There is no half > way. Obviously the output > transistor is working as you noticed the lamp come on at 7.5. The circuitry > does take a little current > to work so its almost certainly as the Speedy suggests. > > wrote in message > > ups.com... > > > > > On Aug 28, 4:30?pm, Speedy Jim > wrote: > >> wrote: > >> > I am looking at a '70 beetle. It has a vacuum advance dizzy with > >> > electronic ignition which I am not familiar with instead of points and > >> > condensor. I can't tell the make. While checking the advance with > >> > the homemade Muir lamp I noticed it stayed lit dimly all the way > >> > around the clock until it got to about 7.5 and then lit up fully. Is > >> > this normal for electric ignitions? > > >> > The engine takes takes about 6 seconds to catch although all the tune > >> > up settings are good. It idles fine but has an intermittent miss at > >> > speed. > > >> > David > > >> That's probably normal leakage thru the electronics. > > >> The long cranking may have nothing to do with the spark; > >> more likely slight flooding. > > >> If the miss occurs at odd times under load, inspect every > >> push-on terminal in the Coil circuit for looseness. > >> Then check the distributor advance plate for the tiny > >> braided pigtail lead. If broken, the pigtail won't > >> provide proper grounding as the advance plate rotates. > > >> Speedy Jimhttp://www.nls.net/mp/volks/ > > > Thanks so much! I'll check those items tomorrow. The mosquitos were > > too fierce this evening. > > David- Hide quoted text - > > - Show quoted text - Thanks also. This group is great and the ongoing education of owning a beetle continues for me. |
#6
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Electronic ignition dizzy question
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