adjustable throttle position sensor
Thread Starter
Racer
Joined: Aug 2000
Posts: 400
Likes: 0
From: Irmo, S.C
adjustable throttle position sensor
I just got through installing an adjustable throttle pos. sensor. Unfortunately I lost the paper that told me what the voltages should be. I know that WOT voltage should be in the 4.5 area but I can't remember what it should be at idle. Anyone know? Also, no matter how dramatically I move the new sensor, I can only get to 4.3 at WOT....and if I set it there, I'm pretty sure the voltage for idle will be off. Anyone have any suggestions?
Thanks,
Jason
Thanks,
Jason
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: adjustable throttle position sensor (97Supra)
I didn't think the adjustable unit worked after '90.
On the L98 you set the base idle voltage to 0.65Vdc safely; the ECM will throw the code above 0.67Vdc. My method of adjustment for a L98 is on my site.
A scan tool will of course tell you if the ECM is going open loop under WOT operation.
On the L98 you set the base idle voltage to 0.65Vdc safely; the ECM will throw the code above 0.67Vdc. My method of adjustment for a L98 is on my site.
A scan tool will of course tell you if the ECM is going open loop under WOT operation.
Melting Slicks
Joined: Apr 2002
Posts: 2,308
Likes: 1
From: Portsmouth VA
Re: adjustable throttle position sensor (vettmanlt4)
you can use the 89's adjustable TPS on the 90-96 and as long as you set it below 1.0V at idle it'll auto zero and i haven't gotten a code yet... the most i've gotten is 4.6V on mine at WOT and my friends 90 got almost 4.8 but then was way off at idle.
Melting Slicks
Joined: Apr 2000
Posts: 2,793
Likes: 46
From: Elizabeth City, NC
Re: adjustable throttle position sensor (SonnyinVA)
You can only use the 89 and below adjustable style on the 85-91's the LT1's take a different style all together. For some reason in 90 they switched it to a non adjustable unit on the L98's. You can either make the holes larger or buy the 89 and below unit.
Thread Starter
Racer
Joined: Aug 2000
Posts: 400
Likes: 0
From: Irmo, S.C
Re: adjustable throttle position sensor (vettmanlt4)
Hi. Yeah, the stock unit is non-adjustable, but Mid America sells an adjustable replacement (said to help smooth idle which is why I got it) specified for my model year. Unfortunetly I can not get it past 4.3 v. at WOT. At that voltage, am I losing performance? Any ideas how to get it up to 4.6?
Thanks,
Jason
Thanks,
Jason
