OT-Digifant Jetta Question

[rapieper at yahoo.com (Ron Pieper)]

Excellent answer.  I would add from experience that the best way to look for smooth electrical
operation of the MFA is not with an ohmmeter, but with a voltmeter and the unit under power. 
Several years ago, mine looked bad when the ohmmeter (Simpson 360, old swing-arm type, best in
these applications) bounced all over as I operated the throttle.  When I switched to Volts and
checked the unit under power, the operation was as smooth as silk.  The unit was indeed fine and
now has about 80,000 more miles on it.

Ron

--- David Utley <mr.utility@highstream.net> wrote:
> Digifant cars use a Mass Air flow meter that delivers info to the computer
> via a copper contact that slides up and down a path of carbon on a circuit
> board...  As the unit gets older, the path gets more and more worn over
> time, esp where there is the most wear...  Between idle and 2500 rpm is the
> most common area of these to begin to give the computer erratic
> information....  What has most likely happened is the copper foot has worn
> through the circuit board at certain points, esp at the speeds you
> mentioned...  I would take the thing off, and put a digital mulitmeter to it
> and see if it gave you a clean, consistent and gradual ohm change from rest
> position to open throttle position...  If not, it is most definitely your
> problem.  If so, then look elsewhere for the culprit...
> 
> HTH
> 
> David
> 
> -----Original Message-----
> From: scirocco-l-bounces@scirocco.org
> [mailto:scirocco-l-bounces@scirocco.org]On Behalf Of Rick Kellner
> Sent: Saturday, February 07, 2004 11:54 AM
> To: 'scirocco list'
> Subject: OT-Digifant Jetta Question
> 
> My DD, a 91 Jetta 1.8l Digifant, has an annoying running problem.  It
> will stumble or stutter at low RPM when you first give it some gas.
> Basically, if the car is idling and you give it a quick tap on the
> accelerator, it will run rough and stumble between 1k and 2k rpms.  It
> acts like a carbureted car when the accelerator pump on is the way out.
> 
> Any ideas?
> 
> Thanks, Rick K.
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