iank1
New Member
- Joined
- Aug 30, 2013
- Messages
- 27
- Reaction score
- 0
- Points
- 0
- Vehicle Year
- 1994
- Make / Model
- Ford
- Engine Size
- 2.3
- Transmission
- Manual
OK, '94 2.3l 5 speed, no AC, California emissions.
So I've been chasing down all these damn CEL issues, One MIGHT have been caused by a heater hose laying across the air charge/temp sensor. I'll update on that later.
Today I decided to test the TPS signals. OK, as follows, the main voltage signal, 5.0 volts on the nose. perfect. Sweep voltage, even and smooth, even while banging on it. Ground signal 12.0 volts, perfect. LOW IDLE VOLTAGE (here's the AHA! moment) When the idle screw is set to a reasonably low idle, engine hot, the voltage is .3 (!?!?) instead of .9 volts. Hence, code 121. SO with my multi-meter hooked up I turned the screw up until I hit .9 and VOILA! no more codes.... PROBLEM: now the hot idle is something like 1500 RPM. I can't turn the screw back down since I'll get the code again, it's like I need to twist the TPS on it's mount (or get a better quality one?) any pointers?
THANKS!
So I've been chasing down all these damn CEL issues, One MIGHT have been caused by a heater hose laying across the air charge/temp sensor. I'll update on that later.
Today I decided to test the TPS signals. OK, as follows, the main voltage signal, 5.0 volts on the nose. perfect. Sweep voltage, even and smooth, even while banging on it. Ground signal 12.0 volts, perfect. LOW IDLE VOLTAGE (here's the AHA! moment) When the idle screw is set to a reasonably low idle, engine hot, the voltage is .3 (!?!?) instead of .9 volts. Hence, code 121. SO with my multi-meter hooked up I turned the screw up until I hit .9 and VOILA! no more codes.... PROBLEM: now the hot idle is something like 1500 RPM. I can't turn the screw back down since I'll get the code again, it's like I need to twist the TPS on it's mount (or get a better quality one?) any pointers?
THANKS!