ok i datalogged start up, cruising and some wot runs all in one file. I noticed my tps voltage was low at idle...around .3. I also notice the a/f ratio was 14.73:1..that lean isnt it?

I was wondering if someone could take a look at my data and help me better understand my car and what its doing. thanks guys

 

A/F 14.7/1 is stoich.

closed loop 02 feedback is commanding 14.7. so 14.73 is about right.

WOT is best datalogged with a WB.

 

ok thanks

i sent the data to alvin who did my tune (pcmforless) he said my tps voltage is too low all the time making the car think its idling most of the time. its not allowing it to go into a driving fuel trim because of this..its also causing burst knock here and there

 

If indeed your TPS voltage is at .3v then it is to low. It should be around .55v and should be adjusted. There is a range with .62V on the high side but can't remember the low side.

 

they guy whos tuning the car said he wants that voltage at at least .7 and 4.XXX at wot

 

"0.540VDC +/- 0.075VDC or 0.465VDC to 0.615VDC for MAF equipped cars, 0.710VDC +/- 0.050VDC or 0.660VDC to 0.760VDC for non-MAF or Speed Density equipped cars"

 

mine is non adjustable and shows .52 in log. brand new GM 1995 TBI. only way i can change it is to raise idle rpms. car idles at 850 rpms at .52V. on tps.

 

yea mines unadjustable too...and its running at 900-1000, jumps around a bit because of the cam and is showing 4.5...if i lower it to around 850, ill stay .4 something. I guess mine might be busted...ill have to look into getting a new one


i cant adjust it unless i too, raise the rpms. So i guess that means mine is broken?