Question about 1998 Honda Passport

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1998 passport while idling it will tac at below 1 no problems, sometimes it will shoot up to above 2 usually when I stop and go or go from drive to park to drive again and then my tranny starts to shift rough. usualy this happens with stop and go driving and seems like when it is hotter weather. highway driving seems fine. how do I get the idle to stay at 1 or below and stop this inconsistancy? thank you!!!

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Have the idle air control valve and the throttle position sensor checked.

Posted on Jul 31, 2009

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It sounds like the relief valve is sticking. How frequently do you change your transmission fluid?

Posted on Jul 31, 2009

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1 Answer

Where is idle control on 2007 4.2 ford f150


Your vehicle has electronic throttle control or some call it drive by wire ! There is a 12 volt dc motor on the throttle body the PCM controls !
The electronic TAC is a DC motor controlled by the PCM (requires 2 wires). The gear ratio from the motor to the throttle plate shaft is 17:1. There are 2 designs for the TAC, parallel and in-series. The parallel design has the motor under the bore parallel to the plate shaft. The motor housing is integrated into the main housing. The in-series design has a separate motor housing. Two springs are used; one is used to close the throttle (main spring) and the other is in a plunger assembly that results in a default angle when no power is applied. The force of the plunger spring is 2 times stronger than the main spring. The default angle is usually set to result in a top vehicle speed of 48 km/h (30 mph). Typically this throttle angle is 7 to 8 degrees from the hard stop angle. The closed throttle plate hard stop is used to prevent the throttle from binding in the bore (~0.75 degree). This hard stop setting is not adjustable and is set to result in less airflow than the minimum engine airflow required at idle. For additional information, refer to Torque Based Electronic Throttle Control (ETC) in this section.

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1998 Nissan 200sx won't rev past 4000 RPM in neutral. What's the cause?


STOP doing that, forget about it, your going to blow your engine !

Mar 06, 2013 | 1998 Nissan 200SX

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1998 Honda Passport codes


HO2S12 (Bank 1 Sensor 2) is the after catalytic converter O2 sensor.


o2sensorsbank12-lat3o0cqi2lvyc2yz3poyibl-5-0.jpg Hope this helps?

May 24, 2017 | 1998 Honda Passport

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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

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1 Answer

Stupid engine light!!!


is it a V-6 or 4cyl. take it to autozone and have them retrieve the code...I have worked on all models of camrys...many problems can cause this like IAC valve(common on 4cyl) or timing is offset(very common on V-6). Transmission will not cause rough idle. Tacs on these models usually malfunction stemming from distributor cap/coil oil inside or just the tac itself. Hopefully this helps!!

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1998 HONDA ACCORD EX V-6


It may be the throttle position sensor (tps)

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1 Answer

1999 Toyota Camry Idle Problems on Hot days


Clean the IAC. Disconnect throttle body air hose and you will see a hole on the bottom of the throttle body just before the butterfly valve. Spray throttle body cleaner down the IAC hole and then let it soak about 1/2 hour. Reconnect hose and run engine about a minute and then repeat this process 2 or more times. Toyota engines from 1997-2005 commonly have the IAC get cruded up with carbon as early as 35,000 miles. This is a sImple and cheap repair that many repair shops don't want you to know.

Jun 25, 2008 | 1999 Toyota Camry

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