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My car idles heavy when i turn on my air condition. i change engine mounts and i'm still getting the same problem. help me please!

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Check switch that supposed to increase engine idle when compressor is on.

Posted on Mar 15, 2011

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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

High idle when air con On 3000rpm


The IAC valve is controlled by the ECU. The IAC or Idle Air control valve, adjusts depending on information that the ECU receives from several engine related sensors. You need to look at everything that you can. Inspect all wiring and connections, around the engine. Look for damaged vacuum lines and if you know how to, look for air leaks going into the head. If unmetered air gets into the engine, bypassing the TAC unit. Then the ECU will not be able to make correct adjustments. Also look at the coolant level, temp, and condition. The long and short of it is that the ECU oversees the engine speed. Depending on different parameters, turning on the A/C sends a signal to the ECU that the engine load has been increased. Depending on other information (whether it is correct or not) the engine speed is increased to maintain engine speed. I hope this information helps but if not please write back. Be as specific and detailed as you can and I'll do my best, good luck.

Mar 15, 2014 | Cars & Trucks

2 Answers

Stalls while in drive with foot on brake , changed MAP Sensor, Crank Shaft Sensor , Distributor, Fuel Pump, Fuel Filter , have ran out of ideas


I would check the IAC motor or idle air control motor, heres a little info.about the part.Stratus Sedan, 1999-2005 Idle Air Control Motor

Print


Description & Operation

Not for Dodge Stratus Sedan
The idle air control motor (IAC) attaches to the throttle body. It is an electric stepper motor. The PCM adjusts engine idle speed through the idle air control motor to compensate for engine load, coolant temperature or barometric pressure changes. The throttle body has an air bypass passage that provides air for the engine during closed throttle idle. The idle air control motor pintle protrudes into the air bypass passage and regulates airflow through it.
The PCM adjusts engine idle speed by moving the IAC motor pintle in and out of the bypass passage. The adjustments are based on inputs the PCM receives. The inputs are from the throttle position sensor, crankshaft position sensor, coolant temperature sensor, MAP sensor, vehicle speed sensor and various switch operations (brake, park/neutral, air conditioning).

0996b43f8020234f.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig.

Not for Dodge Stratus Sedan
When engine rpm is above idle speed, the IAC is used for the following functions:


Off-idle dashpot Deceleration air flow control A/C compressor load control (also opens the passage slightly before the compressor is engaged so that the engine rpm does not dip down when the compressor engages)
The idle air control motor (IAC) attaches to the throttle body. It is an electric stepper motor. The PCM adjusts engine idle speed through the idle air control motor to compensate for engine load, coolant temperature or barometric pressure changes. The throttle body has an air bypass passage that provides air for the engine during closed throttle idle. The idle air control motor pintle protrudes into the air bypass passage and regulates airflow through it.
The PCM adjusts engine idle speed by moving the IAC motor pintle in and out of the bypass passage. The adjustments are based on inputs the PCM receives. The inputs are from the throttle position sensor, crankshaft position sensor, coolant temperature sensor, MAP sensor, vehicle speed sensor and various switch operations (brake, park/neutral, air conditioning).

21180_cdia_g257.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig.

When engine rpm is above idle speed, the IAC is used for the following functions:


Off-idle dashpot Deceleration air flow control A/C compressor load control (also opens the passage slightly before the compressor is engaged so that the engine rpm does not dip down when the compressor engages)
Target Idle
Target idle is determined by the following inputs:


Gear position ECT Sensor Battery voltage Ambient/Battery Temperature Sensor VSS TPS MAP Sensor
Target idle is determined by the following inputs:


Gear position ECT Sensor Battery voltage Ambient/Battery Temperature Sensor VSS TPS MAP Sensor


Removal & Installation

  1. Disconnect the negative battery cable.
  2. Disconnect the IAC electrical connector.
  3. Remove the IAC mounting screws.
  4. Remove the IAC.

To Install:
  1. Install the IAC to the throttle body.
  2. Tighten mounting screws to 5.1 Nm (45 inch lbs.) torque.
  3. Attach electrical connector to the IAC.
  4. Connect the negative battery cable.

    0996b43f80202350.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig.


  1. Disconnect the negative battery cable.
  2. Disconnect the IAC electrical connector.
  3. Remove the IAC mounting screws.
  4. Remove the IAC.

To Install:
  1. Install the IAC to the throttle body.
  2. Tighten mounting screws to 5.1 Nm (45 inch lbs.) torque.
  3. Attach electrical connector to the IAC.
  4. Connect the negative battery cable.

May 11, 2012 | 2000 Chrysler Cirrus

1 Answer

I just brought a 91! Accord ex. It needs alot of work I am having a problem with the idle its about 2000rpm adjusted but can't get it down please help


usually a high idle condition is caused by a large vacuum leak.start engine open hood an put ur ear in the engine compartment,listen for any loud sucking sounds ,wiggle vacuum hoses an listen for a change in the sucking noise,usually a telltale sign that youve found it wen the noise changes.also u could have a bad idle air control motor which adjusts an keeps idle around a 1000rpm at idle.i highly recommend gettn ur engines computer scanned for any related codes. a good basis to start ur correct path to diagnosing ur idle issues. good luck hope this helps

May 01, 2011 | Honda Accord Cars & Trucks

1 Answer

While idle cuts off when air condition is on


Solution: 1. The engine has Idle Air Controller (IAC) that is suppose to keep the engine speed at a constant (even with changing load - AC, FAN, etc.) If the IAC is broken your idle will be rough or even die.
The AC compressor places a large load on your engine.If there is a problem with your IAC(Idle air controller)which is located on the throttle body it will cause the vehicle to die when you turn the AC on.Remove the IAC and check it for carbon.If there is carbon try to clean it up with a wire brush.
2. If your air con is drawing more power than your alternator/battery is capable of supplying - you could try fitting a higher charge rate alternator and a heavy duty battery also ensure battery to chassis earth is sound and clean of rust and grime at metalwork.
3.Another reason for this is that when the air con is on, ice and water forms on the outside of the air con pump and condenser. This ice and water can spray around the engine bay and if there is any electrics that are around it can cause a short circuit.The easy way to fix this is to identify the air con pump and condenser, then spay WD40 on all the electrical components you can see in the direct area.
WD40 displaces water and will cause no problems with the cars electrics.

May 08, 2010 | 1994 Honda Accord

1 Answer

Rough engine idle under heavy acceleration. After a heavy rain, I started the car and the idle was terribly rough. Changed out the spark plugs and wires. Its much better but the condition still exists...


heh, you might want to change the title here as I am pretty sure you cant idle under heavy acceleration.
However I think you were on the right track with the plugs and wires. You didnt mention the cap though and that is usually the biggest culprit in damp weather. Put a new cap and rotor on it and see if that doesnt do the trick.

Mar 25, 2010 | 1987 Oldsmobile Ciera

2 Answers

Air conditioning causes car to idle or die.


Depending on whether your car is Injected or Carby induction, The aircon system has an IDLE UP circuit which is supposed to raise the Idle while the Aircon Compressor is engaged. The Compressor cycles on & off to charge the system pressure as required. The Idle up system typically uses an IDLE UP SOLENOID which is usually mounted directly on the throttle linkage at the Carby or Throttle body itself, or a Vacuum Solenoid which switches vacuum to a Diaphram which is connected to a linkage on the Carby or Throttle body itself, or a Vacuum Switch which ports air into the throttle body to raise idle (This type on injected vehicles only). It sounds as if the IDLE UP system has failed or is not adjusted properly. Revving the engine spins the compressor faster thus charging the system sufficiently to dis-engage the compressor, which in turn removes the load from the engine, allowing it to idle again. A simple way to test is to disconnect the Aircon clutch wire (make sure it cannot fall into belt) & switch on the Air with the engine running. The RPM should raise typically around 300 RPM. If it doesn't the IDLE UP is not working. Hope this helps.

Dec 07, 2009 | Nissan Pulsar Cars & Trucks

1 Answer

There is a steady and heavy vibration in the cabin while the engine idles in drive (with the foot brake depressed). this is much less in park or neutral but gets worse with the AC on. all the engine &...


How is the idle? Is it turned up and idles too much when brakes are applied? How are the motor and tranny mounts? Are they good, solid, and sturdy?

Nov 20, 2009 | 1997 Mazda Protege

1 Answer

Rpm drop when open a/c


First of all, a drop in power when AC turned on, is not uncommon due to the fact that it puts quite a noticeable load on a 4 cyl engine, but in saying that your IAC (idle air control motor) should be compensating for the extra load and adjusting idle to normal when this occurs. Try pulling the IAC off & clean it & port it comes out of real good with throttle body spray cleaner, and re-installl it and see if that helps. As far as steering jerking, take a close look at belt condition as well as tension on belt, as it may need adjustment or belt and/or tensioner replaced.

Oct 03, 2009 | 1996 Honda Civic

3 Answers

1994 Nissan Altima shakes while idling


Broken or worn out engine mounts will cause allot of engine vibration in drive at idle, reverse also, change all 4 the mounts, not just the 2 broken ones. As far as slow acceleration no mounts will not cause that, Have you reached the 100,000 mile recommended tune up? have you ever replaced the fuel filter, this is required every 30,000, let me know.

Nov 26, 2008 | 1994 Nissan Altima

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