Loyal1975
Junior Member
- Joined
- Dec 30, 2018
- Posts
- 2
- Reaction score
- 1
- Location
- Oklahoma
- First Name
- Bryan
- Truck Year
- 1990
- Truck Model
- Suburban
- Engine Size
- 350
Truck is a 1990 GMC suburban v1500. 5.7 244k. It's an auction vehicle and I'm having a hard time getting it to run properly. It drives fine under very light throttle pressure but big down under harder throttle. It does not drive over 50mph, just constantly down shifts and loses power.
Hooked up OBD1 and get a code 22. I didn't bother checking volts or anything just changed the TPS. Same code. Checked volts. I've got constant 5 volts, 12 at ground and then .02 at closed throttle. No movement of volts with moving the throttle.
So now I'm thinking my new TPS is bad out of the box, got another one, same thing.
Figured it must be the wiring, changed the pigtail out. Same thing.
Any help would be appreciated. I feel it's something simple I'm missing but I'm pulling hair out trying to figure it out.
Hooked up OBD1 and get a code 22. I didn't bother checking volts or anything just changed the TPS. Same code. Checked volts. I've got constant 5 volts, 12 at ground and then .02 at closed throttle. No movement of volts with moving the throttle.
So now I'm thinking my new TPS is bad out of the box, got another one, same thing.
Figured it must be the wiring, changed the pigtail out. Same thing.
Any help would be appreciated. I feel it's something simple I'm missing but I'm pulling hair out trying to figure it out.
