> dmbrock@julian.uwo.ca complained:
> > <snip>
> > The roughness makes it so that the car will not run over about 2100 rpm- it
> > just jerks right at 2100, no matter how high I try to rev it, until I
> > decelerate. Very frightening. The tach jumps between 0 & the actual
> > reading, and as soon as aI get off the gas (and bre\ing it below 2100), it
> > runs fine. The problem persists, at the same rpm point, when I try to rev
> > it in neutral- ie, it does not depend upon the load on the engine.
> >
On Sun, 23 Feb 1997, Charlie Brown replied:
>
> What year Spit is it? Does it have a mechanical or electronic tach? If
> it's electronic, and the reading keeps dropping to "0", you're running
> out of primary ignition voltage. A fuel starvation problem generally
> causes the tach needle to flutter down.
>
> Does this car have a catalytic converter? A clogged converter can severly
> restrict exhaust flow, making it impossible to rev above a given rpm
> range.
[...snip...]
Thanks Charlie-
I should edit my statement... The bouncy Tach is on the Jetta, not the
Spit. The Jetta has an electronic Tach, the Spit is mechanical. I
guessed it was electrical, because of the sharp changes, but with an
electronic tach, it could be otherwise.
The spit is a '73. No Cat. The behavior of the car above the critical
point is not such that the flow is restricted- more like water in the
line, or a dead (or misfiring) cylinder.
Thanks... I'll let you know how it goes.
--
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David Brock dmbrock@julian.uwo.ca
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