Not revs, tach.

[jason at scirocco.org (Jason)]

You have an ignition problem.  Your tach dropping tells you that the 
ignition system is suddenly not firing.   (The tach gets its signal from 
the coil).
The backfire is caused by the same problem:  Pressing the accelerator is 
allowing fuel and air into the cylinders, and then since it's not being 
ignited, back into the exhaust, which is hot enough to ignite it.  BOOM.

I'm not an 8V person, so I'm not the one to ask about how to diagnose the 
problem - but find out why the coil isn't firing (does your car have a Hall 
sender?) and you'll solve the problem.

Jason





At 12:54 AM 7/31/2003, Legion wrote:
>Hey folks:
>I previously wrote the following ...
>
>When I'm driving or idling, my '82 8v's revs drop to zero and she stutters
>like she's going to stall, and almost does, but then catches and comes back.
>That's if I don't give her any gas.
>If I step on the gas she chugs and then lets off a rifle shot backfire. She
>then usually stalls. And if she stalls out, she often won't restart for a
>long time, if at all.
>
>I realized that it's not my revs that drop to zero, it's my tach needle. The
>revs do struggle along, but my needle nose dives.
>I've learned that "old VWs are know for their wiring going off." Is that
>true, in your well-informed opinions?
>Thoughts, gotos, ideas?
>Thanks to all.
>Legion
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