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06-04-2011
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Last edited by khung88876; 09-11-2011 at 03:30 PM.
06-04-2011
-21 is technically outside of the -16.4 to 16.4 range for LTFT's....
So it seems the car is detecting way too much fuel and attempting to reduce it.
LTFT's should be around -3 to 3 most of the time.
Also appears this was at idle according to the vec speed....
TPS is 20.7% or what?
Can you get the voltage for the TPS?
It should be .40 V at no throttle.
06-04-2011
get a digital multimeter...
also sort out those codes.
theres info on that in the FAQ section at the top of every page.
06-04-2011
if thats 20.7% TPS then yes, get a new TPS sensor.
Its on the side of the TB.
06-04-2011
Honestly? no idea.
Try going to GPONA.com and looking in the GM service manual OR try compnine.com and looking under diagrams/research.
06-04-2011
There is an additional fail-safe APS but 99.9999999% chance that theres nothing wrong with it. As for the user APS, it is the whole accelerate pedal itself. I just replaced mine here a few months ago due to erratic idles while moving. And IIRC there is two bolts holding it on.
06-05-2011
-21 is the Evap purging no worries. Whats the TPS reading at idle?
http://www.streetfire.net/video/2001...ynp_208097.htm
06-05-2011
The problems I was having with mine was cruising down the highway at idle, my RPMs would fluctuate, service bulletin said APS could be the cause. Replaced APS, same problem, tranny warrantied.
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