Question about 1987 Ford F 250

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Engine speed varies at idle. Trottle position

Engine speed varies at idle. Trottle position sensor and idle air valve have been replaced. Any suggestions

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Sounds like u need a new fuel pressure regulater check it by pulling off the vacume line and see if u have any gas in it. If u do u need a new one 58$

Posted on Dec 22, 2009

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Yes vacuam pipe busted check it out.adrian;;;

Posted on Nov 14, 2009

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Check the operation/condition of the PCV valve and associated hoses,

Posted on Nov 14, 2009

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4 Answers

It starts but as soon as it's put into gear acts like it wants to go but quits.


Could be a few things. But here are the obvious. Check for a vacuum leak around the intake. When you put the car into drive it starts putting strain on the engine, a vacuum leak will give it too much oxygen and cause a fuel mixture issue / reading.
If nothing wrong there, you may have a bad throttle position sensor. When you put the car into drive and it starts putting strain on the engine it will pull the idle down then the sensor will adjust it automatically. Hope this helps.

Mar 18, 2015 | 2000 Chevrolet Blazer

1 Answer

My 96 nissan altima dies at idle


Could be a dirty throttle body, vac leak, or a defective idle air control valve. The computer adjusts idle speed by controlling the amount of air entering the throttle body via the control valve.
Is the check engine light on ?

Dec 24, 2012 | 1996 Nissan Altima

1 Answer

I have an 04 Kia spectra with a PO121 code. What domestic this mean


Well.... Here is a full list of the codes I can find that Kia list. Oddly it jumps from P0120 to P0122

I hope the attached will help, but you may need to talk to your dealer.


Diagnostic Codes
Kia
Without Onboard Diagnostics (OBD-II)
2 Distributor no Signal.
3 Distributor G Signal.
7 Fault on SGT Signal.
8 Mass Air Flow Sensor.
9 Engine Coolant Temperature Sensor.
10 Intake Air Temperature Sensor.
12 Throttle Position Sensor.
14 Atmospheric Pressure Sensor.
15 Oxygen Sensor.
16 EGR Valve Position Sensor.
17 Feedback System.
18 Injector No. 1 open or short.
19 Injector No. 2 open or short.
20 Injector No. 3 open or short.
21 Injector No. 4 open or short.
24 Fuel Pump Relay open or short.
25 Pressure Regulator Control Solenoid Valve.
26 Purge Control Solenoid Valve.
28 Solenoid Valve (EGR) open or short.
34 Idle Speed Control Solenoid Valve.
35 Deteriorated Injector.
36 Deteriorated Air Flow Sensor.
37 Intake System Air Leakage.
41 Variable Inertia Charging System Solenoid Valve.
46 A/C Cut Relay open or short.
48 Power Stage Group 1 Malfunction (inside ECM). Injector 1-4 Purge Solenoid Valve, EGR Solenoid Valve or Damaged Power Stage.
49 Power Stage Group 2 Malfunction (inside ECM). Idle Speed Control Valve Failure or Damaged Power Stage.
56 Idle Speed Control Valve Closing Coil open or short.
57 A/C Compressor Input Signal short.
73 Vehicle Speed Sensor open or short.
87 Malfunction Indicator Lamp short Circuit.
88 ECM Data.
99 Battery.





OBD-II

P0100 Mass Air Flow or Volume Air Flow Circuit Malfunction.
P0101 Mass Air Flow or Volume Air Flow Circuit Range/Performance problem.
P0102 Mass Air Flow or Volume Air Flow Circuit Low Input.
P0103 Mass Air Flow or Volume Air Flow Circuit High Input.
P0107 MAP/BARO Circuit Low Input.
P0108 MAP/BARO Circuit High Input.
P0110 A/T Circuit Malfunction.
P0115 Engine Coolant Temperature Circuit Malfunction.
P0116 Engine Coolant Temperature Circuit Range/Performance Condition.
P0117 Engine Coolant Temperature Circuit Low Input.
P0118 Engine Coolant Temperature Circuit High Input.
P0120 Throttle Position Malfunction - Circuit A.
P0122 APP/TPP Sensor Switch Low Input - Circuit A.
P0123 APP/TPP Sensor Switch High Input - Circuit A.
P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control.
P0130 Oxygen Sensor Circuit Malfunction - Bank 1 Sensor 1.
P0131 Oxygen Sensor Circuit Low Voltage - Bank 1 Sensor 1.
P0132 Oxygen Sensor Circuit High Voltage - Bank 1 Sensor 1.
P0133 Oxygen Sensor Circuit Slow Response - Bank 1 Sensor 1.
P0134 Oxygen Sensor Circuit No Activity detected - Bank 1 Sensor 1.
P0135 Oxygen Sensor Heater Circuit Malfunction - Bank 1 Sensor 1.
P0136 Oxygen Sensor Circuit Malfunction - Bank 1 Sensor 2.
P0137 Oxygen Sensor Circuit Low Voltage - Bank 1 Sensor 2.
P0138 Oxygen Sensor Circuit High Voltage - Bank 1 Sensor 2.
P0139 Oxygen Sensor Circuit Slow Response - Bank 1 Sensor 2.
P0140 Oxygen Sensor Circuit No Activity detected - Bank 1 Sensor 2.
P0141 Oxygen Sensor Heater Circuit Malfunction - Bank 1 Sensor 2.
P0170 Fuel Trim Malfunction - Bank 1.
P0171 System too Lean - Bank 1.
P0172 System too Rich - Bank 1.
P0261 Injector Circuit Low - Cyl. 1.
P0262 Injector Circuit High - Cyl. 1.
P0264 Injector Circuit Low - Cyl. 2.
P0265 Injector Circuit High - Cyl. 2.
P0267 Injector Circuit Low - Cyl. 3.
P0268 Injector Circuit High - Cyl. 3.
P0270 Injector Circuit Low - Cyl. 4.
P0271 Injector Circuit High - Cyl. 4.
P0300 Multiple/Random Misfire detected.
P0301 Misfire detected - Cyls. 1-4.
P0302 Misfire detected - Cyls. 1-4.
P0303 Misfire detected - Cyls. 1-4.
P0304 Misfire detected - Cyls. 1-4.
P0325 Knock Sensor Circuit Malfunction
P0326 Knock Sensor 1 Circuit Range/Performance - Bank 1 or Single Sensor.
P0335 Crankshaft Position Sensor Malfunction - Circuit A.
P0336 Crankshaft Position Sensor Range/Performance - Circuit A.
P0340 Crankshaft Position Sensor Circuit Malfunction.
P0342 Crankshaft Position Sensor Circuit Low Input.
P0343 Crankshaft Position Sensor Circuit High Input.
P0400 EGR Flow Malfunction.
P0403 EGR Circuit Malfunction.
P0404 EGR Circuit Range/Performance Malfunction.
P0420 Catalyst System Efficiency below Threshold - Bank 1.
P0422 Main Catalyst Efficiency below Threshold - Bank 1.
P0440 Evaporative Control Malfunction.
P0441 Evaporative Control System - Improper Purge.
P0442 Evaporative Control System - Small Leak detected.
P0443 Evaporative Control System Purge Control Valve Circuit Malfunction.
P0446 Evaporative Vent Control Circuit Malfunction.
P0447 Evaporative Vent Control Circuit Open.
P0448 Evaporative Vent Control Circuit Short.
P0450 Evaporative System Pressure Sensor Circuit Malfunction.
P0452 Evaporative Control System Pressure Sensor Low Input.
P0453 Evaporative Control System Pressure Sensor High Input.
P0455 Evaporative Control System - Large Leak detected.
P0470 Exhaust Pressure Sensor Malfunction.
P0500 Vehicle Speed Sensor Malfunction.
P0501 Vehicle Speed Sensor Range/Performance.
P0505 Idle Air Control System Malfunction.
P0506 Idle Air Control System Malfunction - RPM Lower than expected.
P0507 Idle Air Control System Malfunction - RPM Higher than expected.
P0510 CTP Switch Malfunction.
P0561 System Voltage Unstable.
P0562 System Voltage Low.
P0563 System Voltage High.
P0601 Internal Control Module Memory Checksum Error.
P0604 Internal Control Module RAM Error.
P0703 Torque Converter/Brake Pedal Switch Malfunction - Circuit B.
P0705 Transaxle Range Sensor Circuit Malfunction (PRNDL Input).
P0706 A/T Range Sensor Circuit Range/ Performance.
P0710 Transaxle Fluid Temperature Sensor Circuit Malfunction.
P0711 A/T Fluid Temperature Sensor Circuit Range/Performance.
P0715 Input/Turbine Speed Sensor Circuit Malfunction.
P0722 Output Speed Sensor Circuit No Signal.
P0726 Engine Speed Input Circuit Range/ Performance.
P0727 Engine Speed Input Circuit - No Signal.
P0731 A/T Gear 1 Improper Ratio.
P0732 A/T Gear 2 Improper Ratio.
P0733 A/T Gear 3 Improper Ratio.
P0734 A/T Gear 4 Improper Ratio.
P0740 Torque Converter Clutch System Malfunction.
P0743 Torque Converter Clutch Circuit Electrical.
P0750 Shift Solenoid "A" Malfunction.
P0753 Shift Solenoid "A" Electrical.
P0755 Shift Solenoid "B" Malfunction.
P0758 Shift Solenoid "B" Electrical.
P0760 Shift Solenoid "C" Malfunction.
P1000 Readiness Function Code.
P1115 Engine Coolant Temperature Signal from ECM to TCM.
P1121 Throttle Position Sensor Signal Malfunction from ECM to TCM.
P1170 Front Heated Oxygen Sensor Stuck.
P1195 EGR Pressure Sensor (1.6L) or Boost Sensor (1.8L) Open or Short.
P1196 Ignition Switch "Start" Open or Short (1.6L).
P1250 Pressure Regulator Control Solenoid Valve Open or Short.
P1252 Pressure Regulator Control Solenoid Valve No. 2 Circuit Malfunction.
P1307 Chassis Acceleration Sensor Signal Malfunction.
P1308 Chassis Acceleration Sensor Signal Low.
P1309 Chassis Acceleration Sensor Signal High.
P1345 No SGC Signal (1.6L).
P1386 Knock Sensor Control Zero Test.
P1402 EGR Valve Position Sensor Open or Short.
P1449 Canister Drain Cut Valve Open or Short (1.8L).
P1450 Excessive Vacuum Leak.
P1455 Fuel Tank Sending Unit Open or Short (1.8L).
P1457 Purge Solenoid Valve Low System Malfunction.
P1458 A/C Compressor Control Signal Malfunction.
P1485 EGR Solenoid Valve Vacuum Open or Short.
P1486 EGR Solenoid Valve Vent Open or Short.
P1487 EGR Boost Sensor Solenoid Valve Open or Short.
P1496 EGR Stepper Motor Malfunction - Circuit 1 (1.8L).
P1497 EGR Stepper Motor Malfunction - Circuit 2 (1.8L).
P1498 EGR Stepper Motor Malfunction - Circuit 3 (1.8L).
P1499 EGR Stepper Motor Malfunction - Circuit 4 (1.8L).
P1500 No Vehicle Speed Signal to TCM.
P1505 Idle Air Control Valve Opening Coil Voltage Low.
P1506 Idle Air Control Valve Opening Coil Voltage High.
P1507 Idle Air Control Valve Closing Coil Voltage Low.
P1508 Idle Air Control Valve Closing Coil Voltage High.
P1523 VICS Solenoid Valve.
P1586 A/T-M/T Codification.
P1608 PCM Malfunction.
P1611 MIL Request Circuit Voltage Low.
P1614 MIL Request Circuit Voltage High.
P1624 MIL Request Signal from TCM to ECM.
P1631 Alternator "T" Open or No Power Output (1.8L).
P1632 Battery Voltage Detection Circuit for Alternator Regulator (1.8L).
P1633 Battery Overcharge.
P1634 Alternator "B" Open (1.8L).
P1693 MIL Circuit Malfunction.
P1743 Torque Converter Clutch Solenoid Valve Open or Short.
P1794 Battery or Circuit Failure.
P1795 4WD Switch Signal Malfunction.
P1797 P or N Range Signal or Clutch Pedal Position Switch Open or Short.

Jun 21, 2011 | 2004 Kia Spectra

2 Answers

High idle on 98 chevy 5.7. changed Intake manifold & gasket,TPS, IAC Valve, 02 sensor, map sensor. plugs good, wires good, New cap & rotor. no vacum leak. Picked out a identical PCM but need to...


unplug cruise contoll cabel at trottle body some times these get jamed not letting trottle return remove cable to see if this is your prob.

Jan 16, 2011 | 1998 Chevrolet C1500

2 Answers

My idle drops everytime i come to a complete stop and even when i put it into reverse and also sometimes the car shuts down...


Idle Air Control (IAC) Valve OPERATION The ECM is programmed with specific engine speed values to respond to different engine conditions (coolant temperature, air conditioner on/off, etc.). Sensors transmit signals to the ECM which controls the flow of air through the bypass of the throttle valve and adjusts the idle speed to the specified value. Some vehicles use an Idle Speed Control (ISC) valve while others use an Air Valve (AV) or Idle Air Control (IAC) valve to control throttle body by-pass air flow. TESTING 2S-ELC Engine
  1. With the engine running and the coolant temperature below 140°F (60°C), pinch off the Air Valve hose and verify that the idle is reduced by no more than a 100 rpm.
  2. Unplug the valve wire connector and measure the coil resistance with an ohmmeter. It should be 40-60 ohms with the coolant temperature at 176°F (80°C) and the air valve closed.
  3. If not as specified, replace the valve. 3S-FE and 5S-FE Engines NOTE: The idle speed must be set correctly before testing the ISC valve.
  4. Bring the engine to normal operating temperature with transmission in N.
  5. Using a jumper wire, connect the terminals TE1 and El of the check connector (DLC 1). Fig. 1: Attach a jumper wire to the terminals TE1 and E1 in the DLC 1 89554g46.gif

  6. The engine rpm should rise to 900-1300 rpms for 5 seconds. Check that it returns to idle speed. If rpm is as specified, the valve is functioning properly.
  7. If rpm did not function as specified, stop the engine and disconnect the jumper wire.
  8. Disengauge the ISC valve connector.
  9. Using an ohmmeter, measure the resistance between the +B terminal (middle terminal) and the ISC1 - ISC2 (3S-FE) and the ISCC - ISCO (5S-FE) outer terminals. Fig. 2: Attach an ohmmeter and measure the resistance between the three terminals - 3S-FE engine 89554g49.gif
    Fig. 3: Attach an ohmmeter and measure the resistance between the three terminals - 5S-FE engine 89554g47.gif

  10. The resistance should be 16-17 ohms on the 3S-FE engine and 19.3-22.3 ohms on the 5S-FE engine.
  11. If not as specified, replace the ISC valve.
1MZ-FE Engine NOTE: The idle speed must be set correctly before testing the valve. Make sure the A/C is off during testing. Fig. 4: The IAC valve is attached to the lower portion of the throttle body 89554p46.jpg
  1. Bring the engine to normal operating temperature with transmission in N.
  2. Using a jumper wire, connect the terminals TE1 and El of the check connector (DLC 1).
  3. The engine rpm should rise to 1000 rpms for 5 seconds. Check that it returns to idle speed. If rpm is as specified, the valve is functioning properly.
  4. If rpm did not function as specified, stop the engine and disconnect the jumper wire.
  5. Disengage the ISC valve connector.
  6. Using an ohmmeter, measure the resistance between the +B terminal (middle terminal) and the RSC and RSO outer terminals. Fig. 5: Attach an ohmmeter and measure the resistance between the three terminals - 1MZ-FE engine 89554g48.gif

  7. The resistance should be 21-28.5 ohms on a hot engine.
  8. If not as specified, replace the ISC valve.
2VZ-FE and 3VZ-FE Engines
  1. Disengage the ISC valve connector.
  2. Using an ohmmeter, measure the resistance between the B1 terminal (lower middle terminal) and the S1 or S3 (lower outer terminals), and between B2 terminal (upper middle terminal) and the S2 or S4 (upper outer terminals). Fig. 6: ISC terminal identification - 2VZ-FE and 3VZ-FE engines 89554g50.gif

  3. If the resistance is not 10-30 ohms, replace the ISC valve.
  4. Apply battery voltage to terminals B1 and B2 while repeatedly grounding S1, S2, S3, S4, S1 in sequence. Check that valve moves toward the closed position. Fig. 7: Testing the IAC using battery voltage to see if the valve will close-2VZ-FE and 3VZ-FE engines 89554g51.gif

  5. Apply battery voltage to terminals B1 and B2 while repeatedly Grounding S4, S3, S2, S1, S4 in sequence. Check that valve moves toward the opened position. Fig. 8: Testing the IAC using battery voltage to open the valve - 2VZ-FE and 3VZ-FE engines 89554g52.gif

  6. If valve does not function as specified, replace the ISC valve.
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Oct 12, 2010 | 1995 Toyota Camry

1 Answer

While driving truck wants to stall but continues to run, also service engine light comes on.


see if you can pull the codes for vehicle ,,but it sounds like a idle air control valve,iac,,,or sometimes trottle position sensor,,,most the time you can take iac off clean part and trottle body

Aug 30, 2010 | 1994 GMC Sierra

2 Answers

Jaguar xj6 4.0 1990. showing fault code fuel 14, fail 14. what does this code mean ?


2 airflow sensor out of operating range 3 coolant temp sensor out of operating range 4 oxy sensor indicates full rich 5 throttle potentiometer/airflow sensor... (low throttle pot signal with high airflow sensor signal) 6 throttle pot/airflow sensor...... (high throttle pot signal with low airflow sensor signal) 7 throttle pot...idle fuel adjustment failure(idle speed??) 8 intake air temp sensor...open or shorted circuit to sensor 11 Throttle pot at idle: Throttle pot idle trim out of normal range 12 Airflow meter: MAF signal out of range 14 Coolant thermistor: Resistance out of range or static during engine warm up 16 Air thermistor: Resistance out of range 17 Throttle pot: Out of range 18 Throttle pot/Airflow: Low throttle pot signal at high airflow 19 Throttle pot/Airflow: High throttle pot signal at low airflow 22 Fuel pump drive: ECU output to fuel pump relay 23 Fuel supply: Engine running too rich 24 Ignition Drive: ECU output to ignition Amp 26 Air leak: Engine running too lean 29 ECU self check 33 Injector Drive: ECU output to injectors 34 Injector: Looks for Injector dribble 37 EGR Drive: ECU output to EGR switching valve 39 EGR check sensor: EGR not working (normally pipe blocked) 44 Lambda (O2) sensor: Poor mixture control rich or weak (or misfire) 46 Idle speed Control valve: ECU output to Coil AB 47 Idle speed Control valve: ECU output to Coil CD 48 Idle Speed Control Valve: Stepper motor grossly out of position 66 Air pump: ECU output to air pump relay 68 Road speed sensor: Seen speed < 5km/h at high engine airflow 69 Drive/Neutral switch: Seen cranking in "D" or high airflow in "N" 89 Purge Valve drive: ECU output to purge valve
this is all I could find

Nov 09, 2009 | 1990 Jaguar XJ6

3 Answers

Car Stops running when you take your foot of the gas


YOU HAVE A IDLE AIR CONTROL VALVE BAD. THIS CONTROLS AIR MIXTURE OF AIR IN THE TROTTLE BODY. IT GETS CARBON IN THE VALVE AND MAKES IT STICKS. U NEED TO REPLACE IT. IT IS LOCATED IN UNDER THE TROTTLE WITH FOUR SCREWS IT IS A WHITE BOX LIKE SENSOR. GOOD LUCK

Jul 11, 2009 | 2001 Toyota Avalon

2 Answers

Nissan Quest 2001 turns off when idle


Idle air control at base of throttle body. Passages could be plugged or idle hard stop needs adjusting.

Air Intake System Sensors Air intake system sensors include a heated resistor-type mass air flow (MAF) sensor and throttle position (TP) sensor; both supply data to the powertrain control module (PCM). The PCM also monitors engine speed.
Air Intake System Control Devices The idle air control (IAC) solenoid regulates idle speed by adjusting the amount of air allowed into the intake manifold. Adjustment is made by varying the duty cycle output by the powertrain control module (PCM). The PCM will increase the duty cycle for added mechanical or electrical loads. The IAC solenoid is combined with the fast idle control (FIC) solenoid which is turned on when the air conditioner is engaged to help compensate for the additional load. The IAC valve must be replaced as an assembly with the FIC solenoid.
Fast Idle Control (FIC) Solenoid The fast idle control (FIC) solenoid (Figure 1) compensates for idle speed change caused by the operation of the air conditioner compressor. The FIC solenoid is controlled by the FIC relay. The FIC relay is energized when the air conditioner clutch is energized and the relay allows the FIC solenoid to turn on and let an additional volume of air into the intake manifold.
Figure 1: Fast Idle Control (FIC) Solenoid
53edf6d.gif
47fb9be.gif ------------------------------------------------------
Throttle Body (TB) The throttle body (TB) controls the amount of air that flows into the engine through a single butterfly valve. The single butterfly valve opening is determined by the accelerator pedal. The TB is cast with an air bypass channel and houses several emission-related components for the powertrain control module (PCM).
--------------------------------------------------------
Throttle Position Sensor (TP Sensor) The throttle position (TP) sensor responds to the accelerator pedal movement. The TP sensor is a potentiometer that transforms the throttle plate opening angle into output voltage and sends the voltage signal to the powertrain control module (PCM). In addition, the sensor detects the opening and closing speed of the throttle plate and sends the voltage signal to the PCM. Also, the TP sensor is used to determine the air intake when the mass air flow (MAF) sensor fails. This mode of operation is called Fail Safe.
The TP sensor integrates the idle (IDL) switch within the housing. The IDL switch detects when the throttle plate is closed and an idle condition occurs. The PCM is supplied with this input signal.

IDLE SPEED

6bee6c3.gif

Apr 03, 2009 | 2001 Nissan Quest

1 Answer

Need to find out what color the vss wire is under hood


you don't have a vehicle speed sensor (VSS). You have a wheel speed sensor that tells the PCM vehcile speed in place of the VSS. What are you tring to do?
------------------------------------------------------------------------------------
The electronic engine controls consist of the following:
  • powertrain control module (PCM) (12A650)
  • throttle position sensor
  • idle air control valve
  • camshaft position sensor
  • crankshaft position sensor
  • mass air flow sensor
  • intake air temperature sensor
  • heated oxygen sensor—front
  • heated oxygen sensor—rear
  • knock sensor
  • cylinder head temperature (CHT) sensor
  • power steering pressure (PSP) switch
  • Wheel speed sensor
The powertrain control module needs the following inputs to calibrate the engine properly:
  • camshaft position
  • engine rpm
  • engine coolant temperature
  • amount of engine detonat

Feb 28, 2009 | 1999 Lincoln Town Car

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