Hi,
I have an ongoing problem with my 1995 Buick LeSabre 3.8L V6. It starts up cold racing and eventually settles down to an intermittent slow/fast (but not racing) idle. I have a check engine light with codes P0122 (TPS signal low) and P0123 (TPS signal high). Last year I put in a new TPS and MAP sensor which help for a while but the problem came back so my mechanic checked it out and put in a second TPS which has also helped for a while but the problem is back again. When driving the car, the idle will eventually kick back up into a very fast racing, requiring heavier than usual breaking to stop. I have to pull over, shut the car off and wait for a minute before turning it back on. I’m suspecting that I either have a bad TPS connector, a crack in the wiring somewhere, or an issue with the computer. Below is the Engine Group 1 & 2 diagnostics. Any thoughts/help would be appreciated.
Thanks
Dave.
Codes
P0122 TPS Signal Low
P0123 TPS Signal High
Engine Group 1
Gear 2,3,4 SW OFF
AC CL OFF
AC Head Press NORM
AC Request OFF
Batt (V) 13.8
LT Fuel Trim 125
LT Fuel TR CL 0
Boost % 0.0
CC Brake SW OFF
CC On/Off SW ON
CC Res/Acc SW OFF
CC Servo % 0
CC SET MPH 0
CC SET/CST SW OFF
CC Servo Req % 0
EVAP Duty % 13
EVAP Solenoid ON
MIL ON
Coolant 199
EGR Req % 0
EGR VLVPOS % 0
EGR VLvPOS (v) .7
KS Counter 12
Exhaust02 Rich
Fuel Cutoff NO
IAC Pos 35
IDLE REQ RPM 750
INJ PW(ms) 3.6
ST Fuel Trim 12
Knock Ret 0
LOOP STAT CLSD
MAF gr/s 5
IAT degF 60
O2S (mv) 100-800
PNP Switch P/N
PROM ID 1694
Spark Adv 11
TCC Applied NO
TCC Brake SW OFF
TCC Duty Cyc % 0
TCC Slip RPM 255
TCC Solenoid OFF
Throttle % 0 -2
TPS Sensor (v) .73 - 1.22
Trans Temp 94
Engine Group 2
CAT Failed 0
cat Passed 0
CYL 1 - 6 Misfire NO
cYLS Passed / Failed 0
MAP Failed 2
MAP Passes 0
RPM Failed 0
RPM Passes 6
Turbine RPM 0
I have an ongoing problem with my 1995 Buick LeSabre 3.8L V6. It starts up cold racing and eventually settles down to an intermittent slow/fast (but not racing) idle. I have a check engine light with codes P0122 (TPS signal low) and P0123 (TPS signal high). Last year I put in a new TPS and MAP sensor which help for a while but the problem came back so my mechanic checked it out and put in a second TPS which has also helped for a while but the problem is back again. When driving the car, the idle will eventually kick back up into a very fast racing, requiring heavier than usual breaking to stop. I have to pull over, shut the car off and wait for a minute before turning it back on. I’m suspecting that I either have a bad TPS connector, a crack in the wiring somewhere, or an issue with the computer. Below is the Engine Group 1 & 2 diagnostics. Any thoughts/help would be appreciated.
Thanks
Dave.
Codes
P0122 TPS Signal Low
P0123 TPS Signal High
Engine Group 1
Gear 2,3,4 SW OFF
AC CL OFF
AC Head Press NORM
AC Request OFF
Batt (V) 13.8
LT Fuel Trim 125
LT Fuel TR CL 0
Boost % 0.0
CC Brake SW OFF
CC On/Off SW ON
CC Res/Acc SW OFF
CC Servo % 0
CC SET MPH 0
CC SET/CST SW OFF
CC Servo Req % 0
EVAP Duty % 13
EVAP Solenoid ON
MIL ON
Coolant 199
EGR Req % 0
EGR VLVPOS % 0
EGR VLvPOS (v) .7
KS Counter 12
Exhaust02 Rich
Fuel Cutoff NO
IAC Pos 35
IDLE REQ RPM 750
INJ PW(ms) 3.6
ST Fuel Trim 12
Knock Ret 0
LOOP STAT CLSD
MAF gr/s 5
IAT degF 60
O2S (mv) 100-800
PNP Switch P/N
PROM ID 1694
Spark Adv 11
TCC Applied NO
TCC Brake SW OFF
TCC Duty Cyc % 0
TCC Slip RPM 255
TCC Solenoid OFF
Throttle % 0 -2
TPS Sensor (v) .73 - 1.22
Trans Temp 94
Engine Group 2
CAT Failed 0
cat Passed 0
CYL 1 - 6 Misfire NO
cYLS Passed / Failed 0
MAP Failed 2
MAP Passes 0
RPM Failed 0
RPM Passes 6
Turbine RPM 0