Question about Chevrolet 1500

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When starting my 2002 chevy 1500HD 6.0L it will backfire threw the exhaust and hard starting I changed the crank sensor, IAC motor, Throttle position sensor.

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Your best bet would be to take it to the dealer now !

Posted on Apr 19, 2017

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95 dodge dakota back fires above 2000 rpm


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What would cause a 2002 Tahoe to die when you let off the throttle?


1) Bad/clogged Idle Air Control (IAC) especially if you have a oil and gauss air filter.
2) Air leak in the duct between the air filter and Throttle body.
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If no throttle cable the throttle body assembly..

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Where's the idle screw on a 2002 Cadillac Deville


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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.

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1 Answer

2002 Isuzu Axiom motor backfiring runs rough put new front O2


common causes for back firing, low fuel pressure, or restricted injectors, breakdown of secondary ignition coil, internal ignition coil arching, or a dead spot in throttle position sensor.

Jul 20, 2010 | 2002 Isuzu Axiom

1 Answer

I hav a 99 buick regal with 3.8 series 2 V-6 its is hard to start then dies at idle now its backfiring threw plinum an exhaust it crack the plastic cover that covers the top of motor


First of all i cannot figure out what a plinum is lol but that is ok... what i think may be your problem my friend is your crank sensor OR your fuel pump they both perceive similar things. What i would change first is the crank sensor because they are about 15 dollars at your local parts store.

Mar 29, 2010 | 1999 Buick Regal

1 Answer

Throttle body removed and replaced


I'm not a chevy guy, but I think you need to reset the throttle position sensor (TPS) once it's disconnected.

For idle, the throttle plate is almost closed with just a little air getting through. For more air, an IAC idle air control valve lets more air in to maintain an ilde speed. The TPS tells the engine computer when the throttle plate is closed and then the computer tells the IAC to let more or less air in to maintain idle.

So, as long as you reconnected all the connectors you took off, I'm guessing you just need to make some readjustments. Calling your Chevy dealer service department, they can tell you if that's true.

Mar 03, 2009 | 2002 Oldsmobile Silhouette

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