Question about 1995 Honda Odyssey

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Increase idle speed - 1995 Honda Odyssey

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Try cleaning the idle control motor its on the inlet manifold engine side of the butterfly ,other than that i would really need my head under the bonnet to sort it out

Posted on Feb 10, 2012

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Posted on Jan 02, 2017

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What is a solution to fixing the mass air flow system, with code po121


DTC P0121: Throttle Position (TP) Sensor 1 Performance
Circuit/System Description
The engine control module (ECM) uses the following information to calculate an expected airflow rate:
?€¢
The throttle position (TP)


?€¢
The barometric pressure (BARO)


?€¢
The manifold absolute pressure (MAP)


?€¢
The intake air temperature (IAT)


?€¢
The engine RPM


P0121 The predicted air flow and the predicted MAP combined are outside a calibrated range for more than 3 seconds.
Circuit/System Testing

  1. Inspect for the following conditions:
  2. ?€¢
    Vacuum hoses for splits, kinks, and proper connections as shown on Vehicle Emission Control Information label


    ?€¢
    Inspect thoroughly for any type of leak or restriction


    ?€¢
    Air leaks at throttle body mounting area and intake manifold sealing surfaces


    ?€¢
    Throttle body for dirt, debris, and coking--Refer to Throttle Body Cleaning.

  3. Allow the engine to reach operating temperature. Observe the MAP Sensor Voltage parameter with a scan tool. Voltage should be more than 0.8 volt and less than 4 volts.
  4. ?‡'
    If more than 4 volts or less than 0.8 volt, refer to DTC P0106.

  5. Idle the engine. Observe the MAP Sensor kPa parameter with a scan tool. Increase the engine speed slowly and then back to idle. The MAP sensor kPa should change smoothly and gradually as engine speed is increased and returned to idle.
  6. ?‡'
    If the MAP sensor kPa does not change, refer to DTC P0106.

  7. Take a snapshot of the engine data list while performing the actions listed below. The mass air flow (MAF) sensor g/s should change smoothly and gradually as the engine speed is increased and is returned to idle.
  8. ?€¢
    Idle the engine.


    ?€¢
    Increase the engine speed slowly to 3,000 RPM, then back to idle.


    ?€¢
    Exit from the snapshot and review the data.


    ?€¢
    Observe the Mass Air Flow (MAF) Sensor parameter frame by frame with a scan tool. The MAF sensor g/s should change smoothly and gradually as the engine speed is increased and is returned to idle.


    ?‡'
    If the MAF sensor g/s does not change smoothly and gradually as the engine speed is increased and is returned to idle, refer to DTC P0101 or P1101.

  9. Inspect the throttle body for the following conditions:
?€¢
Loose or damaged throttle blade


?€¢
Broken throttle shaft


?€¢
Any throttle body damage


?‡'
If any of these conditions exist, replace the throttle body assembly.

Jun 20, 2015 | 2008 GMC Sierra 1500 2WD

1 Answer

After starting my 98 metro 1 liter the idle increases in less than a few minutes until the engine is racing so fast I have to shut it down, help?


Generally speaking, the only way for the idle speed to increase is if extra air is getting past the throttle plate.
So that could include the throttle plate sticking open, the idle air control valve not closing, or a vac leak somewhere such as a hose or gasket.
If you can cover the throttle body with something and the engine still runs at a high speed there is a large vac leak somewhere.

Jan 22, 2013 | Cars & Trucks

1 Answer

Where is the idle control valve on the 1999 Cadillac De Ville and is it the same thing as the idler motor?


The IAC or idle air control valve is mounted in the throttle body and uses an air passage that opens or closes to increase idle speed where as an idle motor usually pushes against the throttle plate to increase idle speed most idle motors (stepper motors) where phased out and was never used on port fuel injected engines chances are you have an IAC valve

Dec 11, 2012 | 1999 Cadillac DeVille

1 Answer

When the a/c is running, when you stop at an interesection the car stalls


That's usually caused be a low idle speed.
But the processor should increase the idle speed when the A/C is on.

Check the normal ,warmed up idle speed, then step on the brake pedal to see how much the idle drops with the stop light load. Then turn on the A/C to see how much the idle drops.

The processor should increase the idle speed to compensate for the increase in load on the engine.

Jul 22, 2011 | 1998 Mercury Sable

2 Answers

Idles good untill the ac is turned on, then engine surges for a couple of minutes and then stalls out


Your throttle body is dirty and needs to be cleaned....Buy a can of throttle body cleaner.
Now you have 2 options....you can either do a remove and replace cleaning- or you can do a semi clean.,,,simi meaning leave the TB on- but spray the cleaner in- and move the plate back and forth to dislodge the accumulated crud. either way- is your choice....
But when you clean it- disconnect the battery for at least 30 min... so that it loses any bad learned settings...good luck, i hope this helps.

Jul 21, 2011 | 2004 GMC Envoy

1 Answer

High --1600 rpm ?? rpm idle


The normal idle speed is below 1,000 rpm...between 800 to 900 rpm. I suspect that the idle-air control motor has seized and can no longer automatically adjust the engine's idle speed. This part is also responsible for slightly increasing idle speed when the airconditioning is switched on to compensate for the added engine load. Some cars even have a "step-up" solenoid to increase idle.

When replacing the idle-air control motor, remember to clean the port that IAC motor goes into; there will be some carbon build-up that may prevent the part's cone-shaped valve from seating properly. A can of intake valve spray helped along with some Q-tips works well.



Hope this helped.

Have a great day !!!

Apr 07, 2011 | 1992 Buick LeSabre

1 Answer

The vehicle engine is shut off immediately when you release the acceration pedal


PROMLEM MAY BE BECAUSE LOW IDLE SPEED ADJUSTMENT. INCREASE THE LOW SPEED/ IDLE SPEED BY INCREASING THE FUEL INTAKE . IN CARBURATOR VEH. ADJUST THE IDLE SCREW CLOCKWISE. IF IT IS FUEL INJECTOR INCREASE THE FUEL AT PUMP ITSELF.

Nov 19, 2010 | Isuzu i-280 Cars & Trucks

1 Answer

Heavy steering while care is stationary.


At idle speed the the pressere deliver by your steering pump are low; try to modified your pulley to increase the speed at low idle.

Oct 19, 2008 | 1995 Jeep Wrangler

2 Answers

Base idle speed adjustment....1KZ-TE 3.0 litre turbo.


Hi djay,
the idle speed control can be adjusted on the pump by turning the adjusting screw that stops the accelerator lever.
Cheers

Aug 19, 2008 | 1996 Toyota Land Cruiser

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