Re: VSS question

["Bruce Plecan" <nacelp@bright.net>]

Yes, you need it for the car to run right.
Get a memcal for a manual tranny.
Incorporate an inline cable VSS.

Or if that is the same tranny as a 90 car use a 90 ecm, and update as
necessary, meaning MAP sensor and all the later mods., ie delete 9th
injecotor.
Grumpy


| In a manual transmission car with a cable driven speedo, and no cruise, is
| there any real purpose for the VSS?
|
| Background to my question--
|
| 88 IROC-Z, L98, originally 700R4 with cable speedo.  Swapped in T56,
| replaced speedo with AutoMeter electric speedo.  Stock speedo incorporated
| an IR pulse generator to feed a signal to the VSS buffer box.  As it sits
| now, there is no pulse generator, and the VSS buffer box gets no signal,
| therefore the ECM gets no VSS signal.  As a result, code 24 would set.
OK,
| use a jumper to close the Park/Neutral switch, to fool the ECM into
| believing that the 700R4 that no longer existed was always in park, and
| therefore the ECM didn't look for any VSS input. Did the trick, no more
| code 24.
|
| However, it soon became apparent that I've got an idle issue... upon
coming
| to a stop (trans in neutral), the idle speed will often hang out around
| 1500rpm, sometimes even a little higher.  Is there a possibility that this
| is a result of not having a VSS input?  The problem does *not* occur
| always, in fact, sometimes I'll go a week without having the problem.
|
| Any ideas?
|
| Thanks in advance.
|
| Andrew Choset
|
|