Question about 1988 Chevrolet Camaro

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Code36 topic: changed out MAF sensor (was c33), worked great, now c36! where is the location of this "burn off ciruit" at so I can check or change it out? Its not in my manual.

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The "burn off " relay is located underhood on center firewall.

Posted on Jul 18, 2009

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Why is my 2004 gmc yukon 5.3 Z model Burning gas?

Was the fuel mileage better prior to replacing these parts? Did you use an aftermarket MAF sensor? Have you checked scan data parameters with a scan tool hooked to the vehicle for a test drive? I have experienced some aftermarket MAF sensors causing issues. as they are not calabrated properly for vehicle application. They will work, but with side affects such as yours. A road test with a scan tool hooked up and a technician that knows how to interpet the data should be able to give some insight as to what is causing the problem

Feb 23, 2016 | 2004 GMC Yukon

2 Answers

Check engine light on, scan code p0175. I already change MAF and check O2 sensors. have you any advice?

code p 0175 refers to system too rich bank 2===causes --intake blocked ---EVAP canister purge valve ---fuel pressure ---EGR system---injector/s ---HO2S
basically you changed the wrong sensor as the HO2S sensor is the sensor in the exhaust manifold or before the cat converter
It tells the ECM to adjust the injector flow for that bank to a leaner mixture (O2 sensors are after the cat and tell the ECM if the mixture is right for complete burn
it could be from a bad injector that is leaking at the tip and the ECM cannot control the fuel mix

Jan 21, 2016 | 2006 Hyundai Tucson 4WD 2.7L V6

1 Answer

Why does engine run great when first crank them misfire when warms up 2001 tundra v8

this could be:

1. EGR valve

2. Vacuum leak

3. MAF sensor

4. Oxygen sensors

5 Idle air control

6. Ignition components.

7. Valve seats

Start with vacuum leaks and check all the hoses and connections. If the oxygen sensors have never been changed, you should do that. They are like light bulbs and they burn out. The other things are to check the MAF sensor to see if it is clean, Same with the idle air motor and then check the valves etc with a cylinder leak down test.

Jul 26, 2015 | Cars & Trucks

1 Answer

2003 hyundai accent GS chucking

This is the MAF. Its on the intake at the air inlet

Oct 14, 2012 | 2003 Hyundai Accent

1 Answer

Iat sensor high input

What is it? The intake air temperature sensor is small electrical device (Thermistor - temperature dependent resistor) that consists of a small bead on a loop of wire held within a plastic safety frame.

Where is it located? Is most often found associated with the MAF (AMM) in the air ducting immediately after the air filter/cleaner box. On cars without a MAF (a manifold pressure sensor usually takes on the role) the IAT may be sited nearer the throttle opening in the air ducting. It has only two wires that make connection with it. However, when located with the MAF, a combined multi-pin plug will serve both devices.

How does it work? It measures the intake air temperature by simply measuring the resistance in the thermistor bead on the wire. The IAT is most commonly located alongside the MAF. The IAT thermistor sends a signal proportionate to the air temperature (if the usual NTC thermistor the resistance drops with increasing temperature; if PTC type them resistance increases with increasing temperature). With the engine running, fresh air is drawn through the ducting and cools the heated MAF. The temperature of the air, in conjunction with its ability to cool the MAF allows the ECU to determine the mass of air entering the engine and thereby to select the appropriate amount of fuel to use by altering the injection times.

Symptoms of a faulty IAT

  • Higher erratic idle speed - If the IAT is at fault the ECU cannot accurately work out the mass of air entering the engine and may use a default value that is inappropriate.
  • Erratic engine - In the absence of signals from the IAT and MAF the ECU takes readings from the TPS and other sensors and this causes a rough running engine.

How to Check? Unplug the device from the duct and check that it is clean. Put a voltmeter across the contacts and measure the resistance due to the ambient air temperature. If you then breathe on it, raising the local air temperature around the probe, you will see the resistance change as a consequence. You are looking for a change in resistance in line with a change of air temperature. If there is infinite resistance, consistent with a broken circuit, or there is no measurable response to change in air temperature then the IAT is faulty.

How to Fix? Replace it

Dec 11, 2010 | 2002 Mitsubishi Galant

1 Answer

1992 s-10 runs great then will die and not want to start back up i have change the fuel pump, maf sensor, throttle control sensor

Three things you might want to try: check your fire(make sure your plugs are not fouled and your distributor cap and rotor button are not burned) and also check your fuel filter and air filter.

Sep 21, 2010 | 1992 Chevrolet S-10

2 Answers

My 4runner is getting bad gas mileage and won't pull a rolling hill without revving up to 4k. Normally it will hold 70-75 up a rolling hill around 3k. It even felt like it was backing down a knoctch and...

It could be a number of things. My recommendations are as follows:
-bad gas (run some bottles of lucas and injector cleaner thru)
-change air filter
-change fuel filter
-clean MAF sensor with MAF sensor cleaner ONLY
-check MAF sensor voltage readings as per service manual
-Re-calibrate throttle position sensor. They tend to need this around 120-150k miles
-check vacuum level
-check cylinder compression
-Depending on mileage and if there are any codes, replace O2 sensors with Denso only sensors
-Not likely, but the cat could be restricted too

My '01 was doing the exact same thing, and it turned out to be the MAF was dirty- and the fix took about 2minutes and ran me ~$5 for a can of MAF cleaner.

Hope this helps,

Mar 01, 2010 | 2001 Toyota 4Runner

3 Answers

After changing fuel pump 2 days ago on my 97 pontiac gtp. it started idling high (2500rpm) then today after getting code p0102(maf sensor) and codes p0122-p0507-p1441 it died on way home and wont start. is...

You can test the MAF before replacing. It may be a problem with the circuit itself or just a fluke from another problem that is connected to this sensor.

There are two basic types of mass airflow sensors: hot wire and hot film. In the first type, a very thin wire (about 0.2 mm thick) is used as the heated element.
f27-31.gif Components of a hot wire-type mass airflow sensor. Courtesy of Ford Motor Company. The element temperature is set at 100° to 200°C above incoming air temperature. Each time the ignition switch is turned to the off position, the wire is heated to approximately 1,000°C for 1 second to burn off any accumulated dust and contaminants.
The second type uses a nickel foil sensor, which is kept 75°C above ambient air temperatures. It does not require a burn-off period and therefore is potentially longer lasting than the hot wire type.
A faulty MAF will cause driveability problems resulting from incorrect ignition timing and improper air/fuel ratios.
Vane-type MAF Sensors
A vane-type MAF sensor is found on many import and domestic vehicles with EFI. All intake air must flow through the sensor. Some MAF sensors are called volume air flow meters
  • Begin checking a vane-type MAF sensor by checking the voltage supply wire and the ground wire to the MAF module before checking the sensor voltage signal.
  • Always follow the recommended test procedure in the manufacturer's service manual and use the specifications supplied by the manufacturer.
  • Typically, to test the sensor, a digital multimeter (DMM) is used and set on a DC voltage scale. The negative meter lead is connected to ground and the red lead to the MAF signal wire.
f_32.44.gif A voltmeter connected to measure the signal from a MAF sensor. Reproduced with permission from Fluke Corporation.
  • Turn on the ignition switch and press the min/max button, if available, on the DMM.
  • Slowly push the MAF vane from the closed to the wide-open position, and allow the vane to slowly return to the closed position.
f_27.33.gif Move the MAF sensor air vane from open to close to test it. Reproduced with permission from Fluke Corporation.
  • Observe the maximum and minimum voltage readings as the vane was moved.
  • If the minimum voltage signal is zero, there may be an open circuit in the MAF sensor variable resistor.
  • When the voltage signal is not within the manufacturer's specifications, replace the sensor.
WARNING While pushing the mass air flow sensor vane open and closed, be careful not to mark or damage the vane or sensor housing.
  • Some vehicle manufacturers specify ohmmeter tests for the MAF sensor.
  • With the MAF sensor removed, connect the ohmmeter across the sensor's output and input terminals.
f_32.45.gif Ohmmeter connections to a MAF sensor. Reprinted with permission.
  • The resistance at these terminals is normally 200 to 600 ohms.
  • Connect the ohmmeter leads to the specified MAF sensor terminals, and move the vane from the fully closed to the fully open position.
  • With each specified meter connection and vane position, the ohmmeter should indicate the specified resistance.
f_32.46.gif Resistance specifications for a typical MAF sensor with door open and closed. Reprinted with permission.
  • When the ohmmeter leads are connected to the sensor's input and output terminals, the ohmmeter reading should increase smoothly as the sensor vane is opened and closed.
  • To check a vane-type MAF with a lab scope, connect the positive lead to the output signal terminal and the negative scope lead to a good ground.
  • This type MAF should display an analog voltage signal when the engine is accelerated. A defective MAF will have sudden and erratic voltage changes.
f_32.47.gif The trace of a defective vane-type MAF sensor. Reproduced with permission from Fluke Corporation. Hot-Wire-Type MAF Sensors
The test procedure for heated resistor and hot-wire MAF sensors varies depending on the vehicle make and year. Always follow the test procedure in the appropriate service manual. A frequency test may be performed on some MAF sensors, such as the AC Delco MAF on some General Motors' products.
  • To check the MAF sensor's voltage signal and frequency, connect a voltmeter across the MAF voltage signal wire and ground wire.
  • Start the engine and observe the voltmeter reading.
  • On some MAF sensors, this reading should be 2.5 volts.
  • Lightly tap the MAF sensor housing with a screwdriver handle and watch the voltmeter pointer.
  • If the pointer fluctuates or the engine misfires, replace the MAF sensor.
  • Some MAF sensors have experienced loose internal connections, which cause erratic voltage signals and engine misfiring and surging.
  • Set the DMM so that it can read the frequency of DC voltage.
  • With it still connected to the signal wire and ground, the meter should read about 30 Hz with the engine idling.
  • Now, increase the engine speed, and record the meter reading at various speeds.
  • Graph the frequency readings. The MAF sensor frequency should increase smoothly and gradually in relation to engine speed.
  • If the MAF sensor frequency reading is erratic, replace the sensor.
f_32..48.gif Satisfactory and unsatisfactory MAF sensor frequency readings. Reproduced with permission from Fluke Corporation.
  • When a scanner is used to diagnose a General Motors' vehicle, one test mode displays grams per second from the MAF sensor. This mode provides an accurate test of the MAF sensor.
  • The grams per second reading should be 4 to 7 with the engine idling.
  • This reading should gradually increase as the engine speed increases.
  • When the engine speed is constant, the grams-per-second reading should remain constant.
  • If the grams-per-second reading is erratic at a constant engine speed or if this reading varies when the sensor is tapped lightly, the sensor is defective.
  • A MAF sensor fault code may not be present with an erratic grams-per-second reading, but the erratic reading indicates a defective sensor.
  • Frequency-varying types of MAF sensors can be tested with a lab scope.
  • The waveform should appear as a series of square waves.
f_32.49.gif A normal trace for a frequency-varying MAF sensor. Courtesy of Progressive Diagnostics--WaveFile AutoPro.
  • When the engine speed and intake air flow increases, the frequency of the MAF sensor signals should increase smoothly and proportionately to the change in engine speed.
  • If the MAF or connecting wires is defective, the trace will show an erratic change in frequency.
f_32.50.gif The trace of a defective frequency-varying MAF sensor. Courtesy of EDGE Diagnostics Systems.

There is also a
Mass Air Flow (MAF) Burn-Off Module Operation:
00375_maf_burn_off_module.jpgA semi-conductor control for an electronic-ignition system.

Nov 17, 2009 | Pontiac Grand Prix Cars & Trucks

1 Answer

Check engine light

MAF is Mass Air Flow it is located in the air induction pipe between the air filter box and the throtle body. Try getting some Mass Air Flow Sensor cleaner and clean it. Make sure it is completely dry before you reinstall it. Good Luck.

Jul 05, 2008 | 1986 Pontiac Firebird

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