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What is MAF/VAF? Regarding Chevy Trailblazer that will start cold but won't start hot.

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  • Cars & Trucks Master
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Http://www.underhoodservice.com/troubleshooting-mass-air-flow-maf-sensors/

Maybe that link will give you some info? Interesting.
If over fueling, can cause problems with hot restart. Any applicable codes?

Posted on Jan 03, 2018

  • jack layton
    jack layton Jan 03, 2018

    I looked at info for 05 trailblazer, 4.2L engine, no maf sensor listed.

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  • Cars & Trucks Master
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A MAF=Mass Airflow Sensor. VAF=Vane airflow sensor
A MAF measures quantity and density of air coming into the engine. If you unplug the MAF and try starting, the computer will default to factory programming and will calculate air and fuel based on outside air temp, engine temp and pedal position.

Posted on Jan 03, 2018

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: what is vaf

The VAF is the vane airflow,also know as an IAC

Posted on Sep 30, 2008

mp3stud
  • 15 Answers

SOURCE: Getting a code reading saying MAF or VAF circuit

First thing to try - open your hood and look near your air filter. In between your air filter and your engine there will be a few electrical plugs. One will be your VAF or MAF (Mass Airflow Sensor). Check to make sure that the electrical plugs are on good. Don't be afraid to give them a little pull, and push them on tightly. If this does not fix it, check out the video below. It's for a Jeep, but your car may be a similar procedure. It tells you how to clean the sensor. I put some more technical information about how a MAF sensor works below, in case you are interested. Warning - technical information ahead! The mass air flow (MAF) sensor is an air flow meter that measures the amount of air entering the engine. The powertrain control module (PCM) uses the MAF sensor frequency signal in order to provide the correct fuel delivery for a wide range of engine speeds and loads. A small quantity of air entering the engine indicates a deceleration or idle. A large quantity of air entering the engine indicates an acceleration or high load condition. The MAF sensor has an ignition 1 voltage circuit, a ground circuit and a signal circuit. The PCM applies a voltage to the sensor on the signal circuit. The sensor uses the voltage in order to produce a frequency based on inlet air flow through the sensor bore. The frequency varies within a range of around 2,000 Hertz at idle to about 10,000 Hertz at maximum engine load. DTC P0103 sets if the PCM detects a frequency signal higher than the possible range of a properly operating MAF sensor. car dud

Posted on Jun 05, 2009

  • 3640 Answers

SOURCE: 2002 chevy blazer codes 443 449 i replaced the maf...

p0443 is evaporative emission control system, purge control curcuit malfunction, p0449 is emission control system, vent control curcuit malfunction. p0449 is often a filler cap problem on fuel tank. try tightening cap

Posted on Aug 22, 2010

blueextc3221
  • 15935 Answers

SOURCE: MAF circuit malfunction, replaced the MAF and

P0100 OBD-II Trouble Code

Technical Description

Mass Air Flow (MAF) Circuit Malfunction

Basically this means that there's a problem with the Mass Air Flow (MAF) sensor or circuit.

You will likely not notice any serious driving problems, but there may be symptoms like a general decrease in power or sluggishness.
Causes

A code P0100 may mean one or more of the following:

* The MAF may be disconnected, or a wiring connection may be bad.
* The MAF sensor may be faulty.

Possible Solutions

Use an OBD II Reader (or go tou your local parts store and they will for free) and reset the code and see if it comes back.
Then start with the cheapest, easiest repair procedures:

* Check the Mass Air Flow Sensor wiring/harness is connected properly and that there are no broken / frayed wires.
* Unplug and reconnect the MAF wiring harness a few times to clear the contacts.
* Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information).
* Replace the MAF sensor.

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Posted on Sep 28, 2010

ZJLimited
  • 17970 Answers

SOURCE: service engine soon light, code

The Volume Airflow (VAF) / Mass Air Flow (MAF) / Intake Air Temperature (IAT) sensor is located on the air intake housing tube inlet.

Your code is P0102 - Mass Air Flow (MAF) Circuit Low Input, them basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. A more technical description would be that the MAF circuit had lower than expected voltage (air flow). Other MAF sensor circuit DTC trouble codes are P0100, P0101, P0103, and P0104.

zjlimited_1559.jpg

Fig. Identifying mass air flow sensor connector-3.5L, 3.8L, 3.9L and 5.3L engines

Symptoms: You will likely not notice any serious drivability problems, although there may be symptoms such as a general decrease in power or sluggishness.

Causes: A code P0102 may mean that one or more of the following has happened:
The MAF may be disconnected, or a wiring connection may be bad
The MAF may be dirty or otherwise contaminated (Note: if you use a reusable oiled air filter, be careful not to apply too much oil or that can contaminate the MAF).
The MAF sensor may be faulty
The vehicle computer may be faulty (very rare)

Possible Solutions: The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures:
Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires.
Inspect for any air leaks near the MAF sensor.
Take the MAF out and clean it using a spray cleaner such as brake cleaner or electrical contact cleaner. Be gentle with the sensor.
Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information)
Replace the MAF sensor.


Then, like a reference guide check this TSB DTC P0102 MAF and this article about Mass Air Flow sensor, what does it do and how it does it.
Test, check it and keep us updated.

Abotu Oxygen Sensor - O2 codes, will need look some code as P0420 in your OBD II codes reader to check O2 sensor wiring for damage from resting on exhaust pipe or frayed wiring.

Hope this helps.

Posted on Jul 09, 2011

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1 Answer

I have a 2011 tk Holden Barina, takes on average six times to start the engine while cold but no problems when engine is hot. thanks


run the fault codes
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I don't have a listing for the c code but from the other 2 codes I would be checking around the maf/vaf sensors and the HO2S sensor (replace)
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yes
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