TPS problem I think
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Amateur
Joined: Nov 2007
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TPS problem I think
95 Ram with 318, 5 speed manual. Here's the problem. Truck runs great the first 10 miles or so. Then it starts to buck and jerk at particular throttle positions. When I stop, the idle surges and I have to give it a little gas to keep it from stalling.
Trouble codes it's throwing are 1.) oxygen sensor indicates a lean mixture, 2.) throttle position sensor voltage too high or too low, 3.) battery current to the PCM has been interuppted during the last 50 starts.
I put a new TPS on it today and the problem still persists. I've cleaned the throttle body and replaced the air filter. Oxygen sensor is a year old.
Any thoughts or suggestions will be sincerely appreciated. I'll even blast holes in the damn thing with a 12 guage if you think it'll help. Suggestions that I've received in the past from you all has been a big help. Thanks.
Trouble codes it's throwing are 1.) oxygen sensor indicates a lean mixture, 2.) throttle position sensor voltage too high or too low, 3.) battery current to the PCM has been interuppted during the last 50 starts.
I put a new TPS on it today and the problem still persists. I've cleaned the throttle body and replaced the air filter. Oxygen sensor is a year old.
Any thoughts or suggestions will be sincerely appreciated. I'll even blast holes in the damn thing with a 12 guage if you think it'll help. Suggestions that I've received in the past from you all has been a big help. Thanks.
Legend
Joined: Jul 2007
Posts: 7,843
Likes: 13
From: DFW, Texas
If the rig starts to buck after it has warmed up, you can probably rule out the fuel pump, TPS, IAC, MAP sensor, etc.
Here's what the PCM reads during warm-up (also called OPEN loop mode):
² Battery voltage
² Crankshaft position sensor
² Engine coolant temperature sensor
² Intake manifold air temperature sensor
² Manifold absolute pressure (MAP) sensor
² Throttle position sensor (TPS)
² Camshaft position sensor signal (in the distributor)
² Park/neutral switch (gear indicator signal—auto.
trans. only)
² Air conditioning select signal (if equipped)
² Air conditioning request signal (if equipped)
And after warm up (also called CLOSED Loop):
² Air conditioning select signal (if equipped)
² Air conditioning request signal (if equipped)
² Battery voltage
² Crankshaft position sensor
² Engine coolant temperature sensor
² Intake manifold air temperature sensor
² Manifold absolute pressure (MAP) sensor
² Throttle position sensor (TPS)
² Camshaft position sensor signal (in the distributor)
² Park/neutral switch (gear indicator signal—auto.
trans. only)
² Oxygen sensors
Notice the one thing that seems to be different? There's your most likely answer.
Here's what the PCM reads during warm-up (also called OPEN loop mode):
² Battery voltage
² Crankshaft position sensor
² Engine coolant temperature sensor
² Intake manifold air temperature sensor
² Manifold absolute pressure (MAP) sensor
² Throttle position sensor (TPS)
² Camshaft position sensor signal (in the distributor)
² Park/neutral switch (gear indicator signal—auto.
trans. only)
² Air conditioning select signal (if equipped)
² Air conditioning request signal (if equipped)
And after warm up (also called CLOSED Loop):
² Air conditioning select signal (if equipped)
² Air conditioning request signal (if equipped)
² Battery voltage
² Crankshaft position sensor
² Engine coolant temperature sensor
² Intake manifold air temperature sensor
² Manifold absolute pressure (MAP) sensor
² Throttle position sensor (TPS)
² Camshaft position sensor signal (in the distributor)
² Park/neutral switch (gear indicator signal—auto.
trans. only)
² Oxygen sensors
Notice the one thing that seems to be different? There's your most likely answer.