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The engine do not cut off when i disconnect the wire from the air flow sensor do that mean the sensor is bad? do i have to replace the throttle body alone with the air flow sensor?

1989 nissan 2.4L pickup truck the sensor is mount on the side of the throttle body which part i need to buy?

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  • Nissan Expert
  • 255 Answers

Your throttle body should be ok Joe

Posted on May 20, 2017

  • Joe Russell May 20, 2017

    are you saying I just replace the sensor that mount on the side of the throttle body can I buy it with out the throttle body which is the best place to buy a sensor?

  • Rocguy May 21, 2017

    Yes, you can buy it without the throttle body. You can use google to find the best place to get the part.

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SOURCE: engine run rough and black smoke coming from tail pipe why?

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  • 1130 Answers

SOURCE: do the engine suppose to cut off when i disconnect the air flow sensor on a 1989 nissan pickup truck?

It should

Posted on May 17, 2017

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3 Answers

I replace throttle body and wiring harness but the vehicle idles on its on sometimes and the vehicle will cut off when you come to a stop sign. The vehicle will act as its trying to shutdown sometimes...


Hi normally a foreign throttle body requires adaptation with diagnostic equipment , to configure with ECU. Try cleaning the throttle with some solvents, Make sure all electrical sockets are connected firmly.

Mar 25, 2015 | Cars & Trucks

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I have p 1121 and a P 0401 codes on my 1998 ford windstar. are these related? what can I check? replaced the mass airflow sensor recently.




P1121 Ford Throttle Position Sensor Inconsistent with Mass Air Flow Sensor
http://engine-codes.com/p0401_ford.html no they are not related !
Are there any cracks in the rubber hose from air cleaner to throttle body ! That could cause the P1121 air entering after mass air flow sensor !
P1121 - Throttle Position (TP) Sensor Inconsistent with MAF Sensor The PCM monitors a vehicle operation rationality check by comparing sensed throttle position to mass air flow readings. If during key ON engine running self-test the comparison of the TP sensor and MAF sensor readings are not consistent with calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.
  • Air leak between MAF sensor and throttle body
  • TP sensor not seated properly
  • Damaged TP sensor
  • Damaged MAF sensor
Drive vehicle and exercise throttle and TP sensor in all gears. A TP PID (TP V PID) less than 4.82 % (0.24 volt) with a LOAD PID greater than 55% or a TP V PID greater than 49.05% (2.44 volts) with a LOAD PID less than 30% indicates a hard fault. P0401 - EGR Flow Insufficient Detected The EGR system is monitored during steady state driving conditions while the EGR is commanded on. The test fails when the signal from the DPF EGR sensor indicates that EGR flow is less than the desired minimum.
  • Vacuum supply
  • EGR valve stuck closed
  • EGR valve leaks vacuum
  • EGR flow path restricted
  • EGRVR circuit shorted to PWR
  • VREF open to D.P.F. EGR sensor
  • D.P.F. EGR sensor downstream hose off or plugged
  • EGRVR circuit open to PCM
  • VPWR open to EGRVR solenoid
  • D.P.F. EGR sensor hoses both off
  • D.P.F. EGR sensor hoses reversed
  • Damaged EGR orifice tube
  • Damaged EGRVR solenoid
  • Damaged PCM
Perform KOER self-test and look for DTC P1408 as an indication of a hard fault. If P1408 is not present, look for contamination, restrictions, leaks, and intermittents

Mar 09, 2015 | 1998 Ford Windstar

1 Answer

Want to get directions to remove mass air flow sensor in order to inspect it for possible replacement- check engine light is on


Usually can't tell if it's bad by looking. Recommend you test the sensor using a multimeter. Instructions are pasted below.

OPERATION
See Figure 1
The Mass Air Flow (MAF) sensor
measures the amount of air which passes through it. The ECM uses this information to determine the operating condition of the engine, to control fuel delivery. A large quantity of air indicates acceleration, while a small quantity indicates deceleration or idle.
This sensor produces a frequency o
utput between 32 and 150 hertz. A scan t
ool will display air flow in terms of grams of air per second (gps), with a range from 3gps to 150 gps.
12_18_2011_8_01_19_pm.gif

Fig. Fig. 1: Location of the MAF sensor on a 1991 vehicle
TESTINGSee Figures 2, 3, 4, 5 and 6

  1. Visually check the connector, making sure it is connected properly and all of the terminals are straight, tight and free of corrosion.
  2. With the engine running, lightly tap on the MAF sensor and wiggle the wires at the connector, while watching for a change in idle speed. A common problem is MAF sensor wire damage.
12_18_2011_8_07_45_pm.gif
Fig. Fig. 2: MAF sensor circuit
  1. Backprobe using a DVOM set to the Hertz scale between terminals A and B. Simulate operating conditions by blowing air across the sensor. There should be a frequency swing from the air crossing the wire in the sensor. A normal flow signal will be close to 1200 hertz. If the frequency is not shown, or not proportionate to the air blown across the sensor, the sensor is faulty.

  2. 12_18_2011_8_10_00_pm.jpg

Fig. Fig. 3: Attach a DVOM to the MAF sensor electrical connector's top and middle terminals and check for a 5 volt reference signal

12_18_2011_8_10_16_pm.jpg

Fig. Fig. 4: Check the middle and bottom connector terminals for 12 volts

12_18_2011_8_10_45_pm.jpg

Fig. Fig. 5: Connect a DVOM to the MAF sensor and check the air flow's corresponding voltage reading (0.144 volts in this case) ...
12_18_2011_8_10_59_pm.jpg

Fig. Fig. 6: ... then use a hair dryer to blow air into the sensor and note the fluctuation in the reading


  1. Check for battery positive (B+) volt age on terminal C and ground on terminal B. If voltage or ground are not present, check the circuits back to the PCM for continuity.
  2. If you receive the proper amount of voltage at the electrical connector and still have a driveability problem, replace the MAF sensor.
  3. If the sensor and circuits are functional, the PCM may be faulty.
REMOVAL & INSTALLATION On 1987-91 vehicles, the MAF sensor is the electronics portion (black) and the aluminum housing to which it is attached. On later models, the MAF sensor just consists of the electronic portion, mounted to the throttle body.
1992-99 Vehicles
See Figures 11 and 12
  1. Disconnect the negative battery cable.
  2. Unplug the MAF sensor electrical connector.
  3. Remove the 3 retaining screws, then remove the MAF sensor from the throttle body.

12_18_2011_8_16_53_pm.gif

Fig. Fig. 11: On 1992-95 vehicles, the MAF sensor is mounted to the side of the throttle body
12_18_2011_8_17_20_pm.gif

Fig. Fig. 12: The MAF sensor is attached to the top of the throttle body on 1996-99 vehicles
To install:

  1. Carefully position the MAF sensor to the throttle body, then install the retaining screws.
  2. Attach the sensor electrical connector.
  3. Connect the negative battery cable.

Dec 18, 2011 | 1997 Buick LeSabre

1 Answer

Change thermostat on 2004 chevy impala?


first you need drain engine coolant down below thermostat. what engine type 3.8 or 3.4 need to know.the 3.8 engine thermostat housing on top intake follow top radiator hose to thermostat housing.the 3.4 engine you have to remove air filter housing with air inlet duct with mass air flow sensor.you have to remove throttle body with coolant hoses.go to auto parts store buy new throttle body hoses old ones will be hard to remove might have to cut two small hoses also buy new throttle body gasket also. before you can remove throttle body unit you have to remove accelerator cable and downshift cable from bracket bolted to throttle body.once throttle body remove then you can remove thermostat housing bolt remove replace thermostat.

Nov 11, 2011 | 2004 Chevrolet Impala

1 Answer

Surges a lot, it's speeds up and slow down quickly and won't stop. also hard starting ,the engine turns over more than usual and temperature gage doesn't work.


clean the screen on the mass air flow sensor remove the air cleaner intake boot to the throttle body check your air filter for air flow make sure the map sensor is plugged in and the vaccum hose is not restricted check for vaccum leaks. Make sure when you clean the screen you use aerosol cleaner for throttle body and mas air flow sensors dont use starting fluid and only spray one way then gently blow out with air. There is a vaccum hose that can be disconnected at the throttle body if it is off it will flood. if its off watch for someone messing with your car. Check the wire to make sure it is connected to the temperature sensor. Better service your fuel filter if all that is good shape.

Dec 12, 2010 | 2005 Pontiac Grand Prix

1 Answer

C220-manual transmission. erratic idling and sometimes idles up and down. Has been serviced and throttle body cleaned but still does this. Happens more often when the engine is warm.


according to your information it's faulty mass air flow sensor, check mass air flow sensor first, when the Idle rough just disconnect the air flow sensor wiring socket if it's better than when it's connected it's faulty air flow sensor, mass air flow sensor have fitted between air cleaner housing and throttle body, you can see wiring connector been connect on it you have to turn it anticlockwise and remove it. when you fix it back do the reverse order, if it's faulty replace air flow sensor. is this information helped you?

Oct 31, 2010 | 1994 Mercedes-Benz C-Class

1 Answer

Idles fine cuts out at 2500rpms will not get past 2500rpms


The mass air flow sensor, on passenger side of throttle body, if that is disconnected or faulty, the engine will cut out at 2500rpm. And act like its bouncing off the rev limiter.

Oct 23, 2010 | 1997 Nissan Pickup

3 Answers

Car cuts off when coming to a stop.


IF THE ENGINE CUTS WHEN YOU BRAKE ALSO LOOK FOR AN AIR LEAK IN THE HOSE FROM THE INLET MANIFOLD TO THE SERVO (cheaper than a throttle body)

Jul 14, 2010 | 2006 Saturn ION

1 Answer

Where is mass air flow senser on a 1989 buick regal


Hi

Thanks for using FixYa. The BUICK Regal Mass Air Flow sensor is usually installed in the intake air duct between the air filter and the throttle body mounted on the intake manifold. Also check the throttle body for mass air flow sensors location.
On mass air flow sensors with a sense wire, this wire can become contaminated with dust particles. These particles can be removed with automotive solvents that are safe for the use on mass air flow sensors. Before replacing the mass air flow sensor check for air leaks in the connecting air ducts and intake manifold. These leaks can cause similar symptoms as a malfunctioning mass air flow sensor.

Bad or contaminated BUICK Regal Mass Air Flow sensor can possibly cause a wide range of various vehicle drivability problems such as stalling, especially when the engine is cold, misfiring, poor acceleration, etc. In addition, a problem with the Mass Air Flow sensor often causes the "check engine" or "service engine soon" light in the vehicle instrument panel to illuminate.

Please do accept the solution if the issue is resolved or else revert for further assistance.

Thanks
Rylee

Nov 09, 2009 | 1989 Buick Regal

2 Answers

HOW DO I CHANGE THE THERMOSTAT ON A 1998 CHEVROLET LUMINA 3.1


FIRST OF ALL YOU HAVE TO DRAIN SOME COOLANT.JUST ENOUGH SO COOLANT WONT FLOW ALL OVER ENGINE.AND COOLANT TO EXPENSIVE ON THE GROUND.TO GET TO THERMOSTAT.YOU HAVE TO DISCONNECT CONNECTORS TO MAF EGR IDLE SPEED CONTROL AND IAT SENSOR.. REMOVE THROTTLE AND SHIFT CABLES FROM BRACKET.REMOVE AIR FILTER ASSEMBLY WITH MASS AIR FLOW SENSOR.REMOVE BOTTOM PORTION OF AIR FILTER HOUSING.REMOVE COOLANT HOSES FROM THROTTLE BODY.THEN REMOVE THROTTLE BODY ASSEMBLY.YOU HAVE TO DISCONNECT SMALL COOLANT HOSE TOP WATER PUMP.REMOVE SMALL BOLT THAT HOLDS METAL COOLANT LINE TO WATER PUMP.THIS LINE HAS TO BE MOVE JUST ENOUGH SO YOU CAN REMOVE THROTTLE BODY.ONCE THROTTLE BODY OUT THE WAY YOU CAN REMOVE THERMOSTAT.BESURE WHEN YOU PUT EVERYTHING BACK TOGETHER.REPLACE THROTTLE GASKET AND THE COOLANT HOSES COME OFF THROTTLE BODY BESURE TO USE OLD COOLANT HOSES MEASUREMENTS FOR NEW HOSES MEASUREMENTS MAKE SURE YOU BUY THE CURVE HOSE FOR THROTTLE BODY. DONT TRY TO USE STRAIGHT HOSE IT WILL KINK AND CAUSE NO COOLANT FLOW.WHEN YOU ARE DONE.FILL COOLANT BACK TO CORRECT LEVEL AND BLEED COOLANT SYSTEM.

Oct 25, 2009 | 1998 Chevrolet Lumina

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