Silvaram05 Please remove a Spark Plug from 1 7 2 and 8 and tell me the color of the tip. If you see any black carbon build up or a very clean dry brand new tip and let me know so I can diagnose your fuel system. I have provided you with below how to adjust and test the TPS sensor on your throttle body. For the IAC I recommend to buy one Install it and see your result if the idle problem continues reinstall the old one and return the new one and get the money back.
It's the best way to just test the IAC. You can Clean them but I Never waste time. Let me know how it goes
TPS TEST AND ADJUSTMENT:
The 3-wire Throttle Position Sensor (TPS)
is mounted on the throttle body and is connected to the throttle blade shaft.
The 3-wire TPS provides the Powertrain Control Module (PCM)
with an input signal (voltage) that represents the throttle blade position of the throttle body The sensor is connected to the throttle blade shaft. As the position of the throttle blade changes, the output voltage of the TPS changes.
The PCM supplies approximately 5 volts
to the TPS. The TPS output voltage (input signal to the PCM) represents the throttle blade position. The PCM receives an input signal voltage from the TPS. This will vary in an approximate range of from 0.26 volts
at minimum throttle opening (idle), to 4.49 volts
at wide open throttle. Along with inputs from other sensors, the PCM uses the TPS input to determine current engine operating conditions. In response to engine operating conditions, the PCM will adjust fuel injector pulse width and ignition timing.
The PCM needs to identify the actions and position of the throttle blade at all times. This information is needed to assist in performing the following calculations:
- Ignition timing advance
- Fuel injection pulse-width
- Idle (learned value or minimum TPS)
- Off-idle (0.06 volt)
- Wide Open Throttle (WOT) open loop (2.608 volts above learned idle voltage)
- Deceleration fuel lean out
- Fuel cutoff during cranking at WOT (2.608 volts above learned idle voltage)
- A/C WOT cutoff (certain automatic transmissions only)
Here's How :
he throttle position sensor, shift lever, and throttle valve cable are critical to proper operation of the transmission. If one or more of these are out of adjustment or if the TPS is noisy, shifting will be erratic. Before performing any adjustments, check the transmission fluid level and sniff the fluid. Do not make any adjustments until the fluid level is correct, and burned fluid has been replaced. The service manual says to adjust for 0.8-1.2V at idle. On many trucks, this voltage is too low, resulting in TCC chatter at moderate throttle loads. The TPS is not officially adjustable but the mounting holes are slotted and the body can be rotated slightly. Adjustment is relatively easy, and requires only a digital voltmeter and a few hand tools. A little adjustment goes a long way...
TPS wire color code:
Testing and adjusting the TPS:
- Black = ground
- Orange/dark blue stripe (center pin) = signal
- Purple/white stripe = 5V power
1. With the key "OFF", unplug the connector from the TPS.
2. Turn the key "on" and insert DVM probes into the connector to reach the connector pins. Short pieces of wire or paper clips can be used to extend the DVM probes for reaching into the connectors.
3. Read from the purple wire to the black wire (these should be the outside pins). Power should be 5V with the key "on".
4. Turn the key "off" and plug the connector back onto the TPS
5. Insert the leads from the digital volt meter into the back of the TPS connector. The DVM negative probe goes into the back of the connector cavity with the black wire. The positive DVM probe goes into the back of the connector cavity with the orange signal wire.
NOTE: Push the probes into the rear of the connector until the probe tips reach the metal connector pins.
6. Loosen the TPS mounting screws
7. With the engine off and key on: Adjust the TPS position for 1.2 to 1.5V on the signal wire with the throttle at the idle position - more voltage makes more TC clutch pressure, too much will set a fault code. Often, adjusting for 1.4 to 1.5V at idle will cure TC clutch chatter under light load conditions. NOTE: The factory setting is 1.2V max, so proceed carefully.
8. Tighten the TPS screws, slowly open the throttle to the WOT position and then return return to idle. Watch for voltage jumps - the voltage should change smoothly from the idle value to at least 3.5V at WOT (5 volts is all you should be able to get). If the sensor voltage jumps or drops unexpectedly - replace the sensor