Sorry I left out the model info...

It's a 1987 Vanagon Syncro, 1.9WB w/ digifant system.

Again, the issue is that the tacho reading is changing but the actual rpm
is not following. The performance is also effected simutaniously.

The oil may not be related but happened to pop up the very same day.

Thanks.

On Mon, 29 Jul 2002 01:10:52 -0400, Steven Dodson <steven@EPOCHDESIGN.COM>
wrote:

>Here's my mystery problem:
>Occasionally, at any speed or idling, the tacho will jump about or go up to
>4000-5000 rpm's, regardless of what the engines actually doing.
>At the exact same time this occurs, the engine will run poorly. If idling,
>it will increase rpm a little (100-200) and run rough. If at speed, it will
>sometimes hesitate. If accelerating, it hesitates and becomes jerky. The
>problem is effected by road conditions.
>
>The same day this started, something else occured and I not sure they are
>related. At idle, the Oil Warning Light and Buzzer came on. If I rev'd the
>motor up a little, it went away. This has happened 4 or 5 times. It's my
>understanding that the two don't come on together unless the engine is over
>2000 rpm. This is not necessarily happening at the exact same time as the
>above problem.
>
>Another bit of info possibly helpful is that it seems to be idling with an
>excessive HC level (190-250). At 2600 rpm it is well within spec.
>I just replaced the injectors, thinking perhaps a lean mifire was the cause
>of the excess HC but I haven't had it retested yet to see if that corrected
>it.
>
>Thanks in advance for any suggestions.