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[4 Svo] How to adjust Throttle Body



Scott Shidel... wrote:
> So....to get to the bottom line..:)
> Would having the TPS set too high mess up the EEC to the point of
> running on the lean side?  

No. VAF and oxygen sensor system control rich/lean - not the TPS. TPS
can only add a slight correction factor - except for the WOT over-rich
commands. Timing is more affected by the TPS setting - and of course the
idle speed threshold.

> It seems if it is set too high the delta V
> would be less than normal for the same delta X. Would the 'puter interpret
> this as TP not being as far open, and run a leaner table?

Again, no. THe EEC would detect that closed throttle was never existant
- but when the signal went above 4.50VDC, WOT is engaged and the
over-rich state is invoked. If the EEC decides that the TPS is "out of
range" or defective, all signals from it will be ignored so closed, part
and WOT will not be sensed (or corrected for) and this may cause lean
symptoms under actual WOT operation. But this is a different problem -
the sensor being flagged as defective. When this happens a code will
always be flagged so there's an audit trail. Y';all just gotta remember
to read the codes.

-Mike Fleming
Technical Director
SVO Owners Association
Tucson, AZ