Question about 2003 Chevrolet Impala

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2003 impala stuck accelerator..

No cruise control, very high idle.. finally went away after manually torqueing the throttle cable assembly.. ..is this problem mechanical or electrical.?

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  • dsspaquin May 15, 2009

    thanks..much..can i clean (spray)....it while its running..?

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  • 218 Answers

THE TROTTLE PLATE INSIDE THE THROTTLE BODY WILL GET DIRTY AND THE IDLE WILL NOT COME DOWN TO NORMAL.U CAN CLEAN IT W/ A THROTTLE BODY CLEANER U CAN BUY AT ANY PARTS STORE

Posted on May 15, 2009

  • ITSCENTER May 15, 2009

    NO. THE ENGINE MAY DIE.AFTER IT IS CLEANED U WILL NEED TO PUT THE GAS PEDAL TO THE FLOOR TO START

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Stalls intermittently, wrench icon lights up under tach.


Problem with the electronic throttle control .
It should be noted that the ETC system includes a wrench light on the instrument cluster that illuminates when a fault is detected. Faults are also accompanied by DTCS and the "Check Engine Soon" light. Your best bet is to take your vehicle to a reputable ASE certified repair shop .
Overview The Generation II (Gen II) Torque Based Electronic Throttle Control (ETC) is a hardware and software strategy that delivers a transmission output shaft torque (via throttle angle) based on driver demand (pedal position). It utilizes an electronic throttle body, the PCM and a accelerator pedal assembly to control throttle opening and engine torque. The ETC system basically replaces the standard cable operated accelerator pedal, idle air control (IAC) motor, 3-wire throttle position sensor (TPS) and mechanical throttle body .

Mar 29, 2016 | 2004 Ford Explorer XLT

1 Answer

I have a 2005 Ford Crown Victoria the wrench light came on and the car slows down. Can you tell me what should be. Thank you


Torque Based Electronic Throttle Control (ETC) -It should be noted that the ETC system includes a warning indicator (wrench light) on the instrument cluster that illuminates when a fault is detected. Faults are accompanied by DTCs and may also illuminate the malfunction indicator lamp (MIL).
The Generation II (Gen II) torque based electronic throttle control (ETC) is a hardware and software strategy that delivers an engine output torque (via throttle angle) based on driver demand (pedal position). It uses an electronic throttle body, the PCM, and an accelerator pedal assembly to control the throttle opening and engine torque. The ETC system replaces the standard cable operated accelerator pedal, idle air control (IAC) valve, 3-wire throttle position sensor (TPS), and mechanical throttle body.
You should take it to the dealer or an ASE certified repair shop
Automotive Technology Course Electronic Throttle Drive by Wire Testing

Aug 21, 2015 | Ford Cars & Trucks

1 Answer

Gas pedal gets stuck and keeps the car going cant stop without turning the car off


dont drive it. find the cause and fix it now.
Hot and cold engine or BOTH>?
1995 Tracker, no tranny , no 4wd , on engine options stated.
Exact high RPM in neutral, not stated...... 1500 is normal cold.
keeps going in Neutral. (nah , you have 5 ways to stop any car.
key, hand brake, foot brake and neutral. and with 4wd, 1 more neutral.
keep that in mind driving any car.
this car has up to 3 throttle cables that can stick. and more!

1: floor mats hit the pedal>? ala. Toyota style (lawsuits)
2: the three cables are, throttle. , cruise and A/T transmission kick down cable. if car is M/T and no cruise it has 1 cable.
so disconnect it, throttle fixed? (disconn,. 1 by 1, bingo?

no cure?, then its not the pedal , you meant just high idle.
yes, replace the cable or bad parts three.
ok say its not the cables.. (tests proved that)
the 95 came with 2 engines, 8valves and 16valves,
they work differently (8v love so race, 16v loves to stall)

1: ISC Stuck open, common.
2: 8v, any air leaks at all , will cause super high idle speeds.
3: throttle valve in the throttle body is stuckopen (gunk) or the return spring broken (very very rare the latter,in fact never heard of one breaking)
4: IAC (thermal idle control stuck open ,(my 97 was). and lots more.
5: on the 16v it takes 2 failures. to make high idle.
gross rich running engine (cold engine its normal) and any air leak
once hot the engine can not race unless there is huge overfueling
and an air leak.
6: the 8v has this device on the side of the throttle body.
called a dash pot. its just a fast idle vacuum servo.
if stuck open the engine will scream full time....
7: ECU stuck in limphome, can cause too high idle speeds.

we need to know which engine
http://www.fixkick.com/find-parts.html
8v or 16v first.
then does the idle race hot or cold or both (engine temperatures)
if it races , then how fast?, RPM the dash tachometer tells you that.

it can be as simple as a 50cent hose cracked.
to a dead ISC. (idle speed control) IAC is thermal idle air controller.
the IAC must be closed on a hot engine,
if the the engine never gets hot,it will scream full time.

Feb 13, 2014 | 1995 Geo Tracker

1 Answer

2003 Yukon Denali XLT lights flicker, rpm goes up and down when on park or stopped or driving and slow speeds. Sometimes it turns off. I thought it might be bad spark plugs or cables so I changed them and...


Your vehicle has electronic throttle control . Position sensor's in the gas pedal an the throttle body , inputs to the Throttle Actuator Control Module
The TAC module is the control center for the throttle actuator control system. The TAC system is self-diagnosing and provides diagnostic information to the PCM through a dedicated serial data line. The TAC achieves throttle positioning by providing a pulse width modulated voltage to the TAC as directed by the PCM.

The throttle actuator control (TAC) system delivers improved throttle response and greater reliability and eliminates the need for mechanical cable. The TAC system performs the following functions:
• Accelerator pedal position sensing
• Throttle positioning to meet driver and engine demands
• Throttle position sensing
• Internal diagnostics
• Cruise control functions
• Manage TAC electrical power consumption
The TAC system components include the following:
• The accelerator pedal position (APP) sensors
• The throttle body assembly
• The throttle actuator control module
• The powertrain control module (PCM)
Accelerator Pedal Position (APP) Sensor
The accelerator pedal assembly contains 2 individual APP sensors within the assembly. The accelerator pedal position (APP) sensors 1 and 2 potentiometer type sensors each with 3 circuits:
• A 5-volt reference circuit
• A low reference circuit
• A signal circuit
The APP sensors are used to determine the pedal angle. The control module provides each APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensors then provide the control module with signal voltage proportional to pedal movement. APP sensor 1 signal voltage is low at the rest position and increases as the accelerator pedal is applied. APP sensor 2 signal voltage is high at the rest position and decreases as the accelerator is applied.
Throttle Body Assembly
The throttle body assembly consists of the throttle body, the throttle position (TP) sensors, and the throttle actuator motor. The throttle body functions similar to a similar to a conventional throttle body with the following exceptions:
• An electric motor opens and closes the throttle valve.
• The throttle blade is spring loaded in both directions and the default position is slightly open.
• There are 2 individual TP sensors within the throttle body assembly.
The TP sensors 1 and 2 are potentiometer type sensors each with 3 circuits:
• A 5-volt reference circuit
• A low reference circuit
• A signal circuit
The TP sensors are used to determine the throttle plate angle. The control module provides each TP sensor a 5-volt reference circuit and a low reference circuit. The TP sensors then provide the control module with signal voltage proportional to throttle plate movement. Both TP sensor signal voltages are low at closed throttle and increase as the throttle opens.

Flickering light's could be caused by a bad diode in the alternator . Fluctuating idle could be caused same alternator problem or dirty throttle plate.
Throttle Body Cleaning To Restore Idle Quality

Jul 15, 2017 | 2003 GMC Yukon

1 Answer

Cruise control not working when it was it seammed to make the motor run very ruff when i disengaged it by using brake pedal


If the cruise control makes the engine seem to run very rough until disengaging it, there could be a problem with the engine itself. As, most cruise control systems just pull on the throttle cable to maintain speed on the highway based on setting the speed with the button.

So, I would look into the engine maybe having an issue with spark plugs, or wires, or another tuneup or mechanical issue.


Cruise Control Cable Removal & Installation To Remove:
chev_vent_cruise-cont-cabl-at-tb.gif

  1. Before servicing the vehicle refer to the precautions at the beginning of this section.
  2. Remove or disconnect the following:
    • The cable from the throttle lever and the accelerator control cable bracket gm_mv_ven_cruisecable.gif

    • The cable from the module by rotating the cable counter clockwise at the module
    • The cable from the module band
To Install:
NOTE: Ensure that the module strap is not twisted during cable installation
  1. Install or connect the following:
    • The cable to the module band
    • The cable to the module
    • The cable to the throttle lever and the accelerator control cable bracket
  2. Adjust the cruise control cable.
prev.gif next.gif Cruise Control Module Removal & Installation To Remove:
  1. Before servicing the vehicle refer to the precautions at the beginning of this section.
  2. Remove or disconnect the following: gm_mv_ven_cruisecable.gif

    • The cruise control cable from the module gm_mv_ven_cruisecon.gif

    • The electrical connector gm_mv_ven_cruisebolt.gif

    • The mounting bracket bolt from the cruise control module
    • The cruise control module from the mounting bracket
To Install:
  1. Install or connect the following:
    • The cruise control module to the mounting bracket
    • The mounting bracket bolt to the cruise control module
      1. Torque to 53 inch lbs.(6 Nm)
    • The electrical connector to the module
    • The cruise control cable to the module

Oct 11, 2010 | 1999 Pontiac Montana

1 Answer

When i turn on heater or fan engine revs over 3000 rpm


Idle Air Control Valve Pintle may be bad If you disconnect the IAC and the problem ceases it can point to this being the problem.: Removal & Installation 3.5L Engine To Remove:
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Remove the fuel injector sight shield.
  3. Drain the cooling system.
  4. Remove or disconnect the following:
    • The air cleaner intake duct. Figure of IAC and TPS electrical connectors disconnected. aurora_g1.gif

    • The idle air control (IAC) valve and throttle position (TP) sensor electrical connectors. Figure of cruise control and throttle control cables removed from throttle lever. aurora_g2.gif

    • The cruise control cable and throttle control cable from the throttle body lever.
    • The fuel pressure regulator vacuum hose, positive crankcase ventilation (PCV) hose and the throttle body vacuum port hose.
    • The throttle body coolant hoses.
    • The throttle control cable bracket, leaving the throttle and cruise cables connected.
    • The upper nut holding the throttle body to the intake manifold.
    • The throttle body assembly.
  5. Clean the gasket mating surfaces.
To Install:
  1. Install a new gasket and new studs if necessary.
  2. Install or connect the following:
    • The throttle body assembly.
    • Start the top nut by hand.
    • The throttle body coolant hoses.
    • Position the throttle control cable bracket and hand start the retaining nuts and bolt.
    • Torque the three throttle body retaining nuts to 89 in.lbs. (10 Nm). And the bracket retaining bolt to 115 in.lbs. (13 Nm).
    • The throttle body vacuum port hose, PCV valve hose and the fuel pressure regulator hose.
    • The throttle control and cruise control cables to the throttle body lever.
    • The IAC valve and TP sensor electrical connectors.
    • The air intake duct.
  3. Refill the cooling system.
  4. Install the fuel injector sight shield.
4.0L Engine To Remove:
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Relieve the fuel system pressure.
  3. Remove or disconnect the following:
    • Negative battery cable.
    • The Mass Air Flow (MAF) sensor electrical connector.
    • The air cleaner intake duct.
    • The PCV valve fresh air tube. Figure of cruise control cable removed from throttle cable bracket. aurora_g3.gif

    • The cruise control cable and throttle control cable from the bracket.
    • The cruise control cable and throttle control cable from throttle body lever. Figure of IAC valve and TPS connectors removed. aurora_g4.gif

    • The idle air control (IAC) valve and throttle position (TP) sensor electrical connectors. Figure of fuel lines removed from retainer on throttle cable bracket. aurora_g5.gif

    • The fuel feed and return lines from the retainer on the throttle control cable bracket.
    • The transaxle shift cable clip from the throttle control cable bracket. Figure of throttle body removed from water crossover. aurora_g6.gif

    • The throttle body from the water crossover.
To Install:
NOTE: The Mass Air Flow (MAF) sensor inlet and the outlet of the air cleaner assembly must line up when installed. Misalignment may cause MIL illumination or driveability concerns.
  1. Install or connect the following.
    • The throttle body to the water crossover. Torque the bolts to 106 in.lbs. (12 Nm).
    • The IAC valve and TP sensor electrical connectors.
    • The throttle and cruise control cables to the throttle body lever.
    • The throttle and cruise control cables to the throttle control cable bracket. The transaxle shift cable clip to the throttle control cable bracket.
    • The fuel feed and return line retainer to the throttle control cable bracket.
    • The MAF sensor electrical connector.
    • The air cleaner intake duct clamp. Torque the clamp to 27 in.lbs. (3Nm).
    • The PCV valve fresh air tube.
    • The fuel injector sight shield. Torque the nuts to 20 in.lbs. (2.3 Nm).
  2. Install the negative battery cable.
  3. Pressurize the fuel system and verify no leaks.
prev.gif next.gif

Oct 07, 2010 | 2001 Oldsmobile Alero

1 Answer

2003 chev impala cold engine every thing works properly. drive until engine is hot go into store for 30 min.to start engine i have to press accelerator just a little.


Clean out your throttle body, the IAC (idle air control) valve may be sticking from carbon build up. You can get a can of throttle body cleaner at Auto Zone or most auto parts store and follow the instruction on the can.

Make sure you use all of the can and you may want to do it twice with two cans of throttle body cleaner just get it all cleaned out. The IAC controls the amount of air enters the engine to get it started and to idle smoothly with the different loads. A stuck IAC valve will give issues to what you have described.

Thank you for using fixya and be safe.

Sep 08, 2010 | 2003 Chevrolet Impala

1 Answer

Cruise control went out on my 2005 ford taurus and my accelerator gets stuck at times. Should I replace the cruise control?


This is a dangerous defect. What you want to do is isolate the Cruise cable from the Throttle mechanism. Then get the Cruise cable away from the Throttle so it can not jam the Throttle accidentally.

With the engine OFF use your hand and move the remaining Throttle mechanism and feel for sticking or roughness in the control. If you feel binding, start removing the connection of the Throttle cable and work your way through all the moving parts like a Butterfly flap on the Airhorn, the TPS (throttle position sensor) and so on until you find out what is rubbing.

It is possible that the Cruise was disengaging because the Throttle parts were binding. If disconnecting the Cruise eliminates the sticking throttle, then all the problems came from the Cruise control cable or the Cruise Box. Once you have made a thorough check of the Throttle you can blame the Cruise for your problems and replace the parts.

Jun 21, 2010 | 2005 Ford Taurus

3 Answers

Deccelerating a 95 honda civic


Vacuum leak or fast idle sensor inside throttle body. Also check to make sure throttle cable and cruise control cable is not out of place on the cable roller/pulley on top of intake manifold.

Sep 24, 2009 | 1995 Honda Civic

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