Question about Toyota Pickup

1 Answer

How can I determine if the Air intake control for fuel injection is working correctly?

When starting the engine, it seems as it is not getting the correct amount of air. Similar to a carburetor engine when the automatic choke is not working well.

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  • Stephen Miller
    Stephen Miller Jan 03, 2014

    This is an 1986 4cyl engine with fuel injection

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1 Answer

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  • Toyota Master
  • 40,691 Answers

IT may be getting the correct amount of air but getting excessive fuel for starting . So check the air / fuel sensors .

Posted on Jan 03, 2014

Testimonial: "Thanks for your suggestion, Bill. Can you please tell me where this sensor is and how I would check its operability?"

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

SOURCE: European Toyota Corolla 1998 fan and air duct

Hi marco fango,
I'm familiar with the models that are sold for the Japanese and the African markets...As far as I know the European and Japanese are identical, with some of the refinements left out....We have worked on the dis-assembly and reassembly of a number of these vehicles and I have never seen any filtering equipment on any of them.

What I can suggest, is that you check the operation of the recycle and fresh air control....also make sure that there's nothing blocking the ducting....The fan is very efficient when running at full speed and you should have a good breeze from it....If you have any problem with the lower speeds running the fan, you'll find a wire wound resistor inside the cowling....should be on the left hand side of the center heater unit, at the base....

Hope this is a help

All the best Johngee10

Posted on Sep 01, 2008

  • 407 Answers

SOURCE: HOW TO REPAIR FUEL INJECTION FOR GMC YUKON 98

check for plugged fuel filter on the frame rail on driver side, blow through it to see if it is plugged. also have fuel pressure checked if it is below 60 psi replace fuel pump

Posted on May 08, 2009

honeymokey
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SOURCE: 1987 Oldsmobile "starts" but doesn't run.

What is the fuel pressure at?

Posted on Apr 20, 2010

heimlich
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SOURCE: cannot control engine rpm mitsubishi lancer engine

Your IACV idle air control valve has gone bad . When you put the car in gear does it take off and accelerate to about 50 MPH without touching the gas pedal ? Had the same problem. Part from Mitsubishi is about $435 PN # MR578268. It is about $30 to $50 dollars on any other car. If this is the problem, the IACV is located on the throttle body and is held on with three screws. I purchased the whole throttle body at a salvage yard for $40, took the IACV off and put it on my throttle body. Car works normal for now, I am looking for another spare. If enough people complain to MItsubishi and www-odi.nhtsa.dot.gov

Posted on Jul 26, 2010

  • 5370 Answers

SOURCE: Mitsubishi fuel problem

For fuel related problem, the help links are provided below.
Click the link below to go through its procedure: ----

How to relieve fuel pressure?
http://technoanswers.blogspot.com/2012/01/how-to-relieve-fuel-pressure.html
--------
Refueling problem?
http://repairhelpcenter.blogspot.com/2012/01/refueling-problem.html
--------
Car consuming more fuel?
http://repairhelpcenter.blogspot.com/2012/01/toyota-tercel-consuming-more-fuel.html
----------
How to maximize fuel economy on your vehicle?
http://schematicsdiagram.blogspot.com/2011/11/how-to-maximize-fuel-economy-on-your.html
-------
Fuel pump relay troubleshooting ?
http://repairhelpcenter.blogspot.com/2011/10/fuel-pump-relay-and-cooling-fan-relay.html
------------
How to Increase gas mileage vehicle?
http://schematicsdiagram.blogspot.com/2011/12/how-to-increase-gas-mileage-on-2011.html
---------
How to Test and Replace Fuel Injectors?
http://repairhelpcenter.blogspot.com/2011/11/how-to-test-and-replace-fuel-injectors.html
-------------------
How to replace Fuel Tank Assembly?
http://vwrepairhelp.blogspot.com/2011/11/how-to-replace-fuel-tank-assembly.html
--------------
FUEL LINES AND FITTINGS ?
http://repairhelpcenter.blogspot.com/2011/11/fuel-lines-and-fittings-on-acura-car.html
------------
Replacing Fuel Charging Assembly on Car?
http://vwrepairhelp.blogspot.com/2011/11/replacing-fuel-charging-assembly-on-car.html
------------
How to replace Fuel Pressure Regulator ?
http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-fuel-pressure-regulator.html
---------------
How to test Fuel Pressure and replace Fuel Pump?
http://repairhelpcenter.blogspot.com/2011/11/how-to-test-fuel-pressure-and-replace.html
--------------
Car will not take fuel into the fuel tank?
http://repairhelpcenter.blogspot.com/2012/01/car-will-not-take-fuel-into-fuel-tank.html
--------------
PGM-FI Main Relay location?
http://repairhelpcenter.blogspot.com/2011/11/pgm-fi-main-relay-on-acura-car-models.html
------------------
How to Relieve Fuel System Pressure on Car Models?
http://repairhelpcenter.blogspot.com/2011/11/how-to-relieve-fuel-system-pressure-on.html
-----------------
How to Replace a Fuel Injector
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-fuel-injector.html
----------------
How to Replace a Fuel Pressure Regulator?
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-fuel-pressure-regulator.html
-------------
How to Replace a Fuel Pump?
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-fuel-pump.html
-------------------
HOW TO CLEAN A FUEL SYSTEM
http://schematicsdiagram.blogspot.com/2011/07/how-to-clean-fuel-system.html
-----------
HOW TO REPLACE A FUEL TANK
http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-fuel-tank.html
--------------
HOW TO REPLACE A FUEL TANK CAP
http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-fuel-tank-cap.html
------------
HOW TO REPLACE A FUEL PUMP ASSEMBLY
http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-fuel-pump-assembly.html
-----------
How to change fuel injector on gmc ?
http://schematicsdiagram.blogspot.in/2012/03/how-to-change-fuel-injector-on-2005-gmc.html
------------
Time to replace Fuel pump?
http://schematicsdiagram.blogspot.com/2011/12/time-to-replace-fuel-pump-on-1998-ford.html
-----------
Emergency fuel shut switch location?
http://schematicsdiagram.blogspot.com/2011/12/emergency-fuel-shut-switch-on-ford-car.html
---------------
How to jump fuel pump?
http://schematicsdiagram.blogspot.com/2011/12/how-to-jump-fuel-pump-on-chevrolet.html
------------
Car wont start when cold?
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html
--------
Car wont start after sitting overnight?
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-after-sitting-overnight.html
---------
Car loses power while acceleration?
http://schematicsdiagram.blogspot.com/2011/12/car-loses-power-while-acceleration.html
------------
Fuel leaks from fuel pulsation dampener?
http://repairhelpcenter.blogspot.com/2012/01/fuel-leaks-from-fuel-pulsation-dampener.html
----------
Car will not allow to put fuel?
http://repairhelpcenter.blogspot.com/2012/01/car-will-not-allow-to-put-fuel.html
-----------
Adding performance chip to increase Fuel mileage MPG?
http://technoanswers.blogspot.com/2012/01/adding-performance-chip-to-increase.html
--------------
How to test Electric fuel pump?
http://technoanswers.blogspot.com/2012/01/how-to-test-electric-fuel-pump-on-gmc.html
---------
Fuel gauge drops to Empty?
http://technoanswers.blogspot.com/2012/01/fuel-gauge-drops-to-empty.html
-----------
Fuel pump not working on Ford?
http://technoanswers.blogspot.in/2012/01/fuel-pump-not-working-on-1991-ford.html
--------------
Fuel pump has no power on ford diesel?
http://technoanswers.blogspot.in/2012/01/fuel-pump-has-no-power-on-2002-ford-350.html
------------
Pushing on the gas pedal but the car slows down? Gas pedal to the floor and the car slows down?
http://technoanswers.blogspot.in/2012/02/pushing-on-gas-pedal-but-car-slows-down.html

---------
Ford Fuel pump Relay and fuse location diagram?
http://technoanswers.blogspot.in/2012/02/ford-fuel-pump-relay-and-fuse-location.html

--------
Ford inside fuse box diagram showing fuel pump relay?
http://technoanswers.blogspot.in/2012/02/ford-inside-fuse-box-diagram-showing.html
---------------
Ford fuel pump fuse layout diagram?
http://technoanswers.blogspot.in/2012/02/ford-fuel-pump-fuse-layout-diagram.html
--------------
How to lower fuel pressure on
Toyota?
http://schematicsdiagram.blogspot.in/2012/02/how-to-lower-fuel-pressure-on-toyota.html

------------
Fuel pump not running?
http://schematicsdiagram.blogspot.in/2012/02/fuel-pump-not-running.html
--------------
How to replace fuel filter on BMW?

http://schematicsdiagram.blogspot.in/2012/03/how-to-replace-fuel-filter-on-bmw-525i.html
----------

This will help.
Thanks.

Posted on Mar 05, 2012

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1 Answer

What is a maf sensor


A mass (air) flow sensor (MAF) is used to find out the mass flowrate of air entering a fuel-injected internal combustion engine.
The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature, altitude and the use of forced induction, which means that mass flow sensors are more appropriate than volumetric flow sensors for determining the quantity of intake air in each cylinder. (See stoichiometry and ideal gas law.)
There are two common types of mass airflow sensors in use on automotive engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with additional sensors and inputs, an engine's ECU can determine the mass flowrate of intake air.
Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0.0-5.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings for most post OBDII vehicles. Vehicles prior to 1996 could have MAF without an IAT. An example is 1994 Infiniti Q45.
When a MAF sensor is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop controller predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass.

Aug 03, 2015 | Cars & Trucks

1 Answer

My is putting to much fuel or no enough oxygen where is the sensor. Mercruiser 6.2 2002


All MerCruiser EFI engines operate on the fuel injection strategy called "Speed/Density". This means that the ECM primarily looks at the engine's speed and the intake manifold's air density in order to calculate the correct amount of fuel to inject. The engine requires an air/fuel mixture of approximately 14:7 to 1 in the combustion chambers. Since the EFI system doesn't control air flow, it must determine how much air is flowing through the engine in order to calculate the correct amount of time to fire the fuel injectors. The net result is that there must be 1 part of fuel for every 14.7 parts of air going through the engine. in this case there is no sensor but you need to determine the speed/airflow measure to know if your mixture is right.

Feb 01, 2015 | Cars & Trucks

2 Answers

Do my 1996 gmc box van engine fuel injection or carburetor


Look.
If you see a fuel rail or a short-throat throttle body, it is fuel injected.
If you see a carburetor... well, I think you get the point :)
From the year (unless it is a non-U.S. model), it is most likely FUEL INJECTED.

Jul 25, 2014 | GMC Cars & Trucks

1 Answer

What is a MAP sensor on a 2001 hyundai accent


It is a sensor located on the air intake to your engine. It controls how much air your car pulls in for combustion. Following is the wiki definition:



The manifold absolute pressure sensor (MAP sensor) is one of the sensors used in an internal combustion engine\'s electronic control system. Engines that use a MAP sensor are typically fuel injected. The manifold absolute pressure sensor provides instantaneous manifold pressure information to the engine\'s electronic control unit (ECU - computer that runs the engine). The data is used to calculate air density and determine the engine\'s air mass flow rate, which in turn determines the required fuel metering for optimum combustion and influence the advance or retard of ignition timing.

Feb 09, 2014 | 2001 Hyundai Elantra

1 Answer

I have a code reader and the code is P0171 P0174 System too lean. what makes the system too lean?


P0171 - Fuel Injection System Too Lean Bank 1
Possible Causes:
- Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection

P0174 - Fuel Injection System Too Lean Bank 2
Possible Causes:
- Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection

What Causes These Codes: Fuel injection system does not operate properly. The amount of mixture ratio compensation is too large. (The mixture ratio is too rich.) The Powertrain Control Module (PCM) monitors the engine Air/Fuel mixture ratio, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The PCM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the PCM judges the condition as the fuel injection system malfunction and light up the engine light. The codes is usually set when there is an intake leak after the air flow meter, before replacing any parts check for loose or broken hoses and intake gasket leak. On Ford some models dirty air filter, and dirty or faulty air flow sensor are the cause of the problem.

Jan 16, 2011 | 2000 Ford Explorer

1 Answer

MY 03 CTS RUNS FINE BUT AFTER I FUEL UP IT HAS PROBLEMS STARTING , and i would also like to kno whats the purpose of a oxygen sensor , thank you very much


Automotive oxygen sensors, colloquially known as O2 sensors, make modern electronic fuel injection and emission control possible. They help determine, in real time, if the air fuel ratio of a combustion engine is rich or lean. Since oxygen sensors are located in the exhaust stream, they do not directly measure the air or the fuel entering the engine. But when information from oxygen sensors is coupled with information from other sources, it can be used to indirectly determine the air-to-fuel ratio. Closed-loop feedback-controlled fuel injection varies the fuel injector output according to real-time sensor data rather than operating with a predetermined (open-loop) fuel map. In addition to enabling electronic fuel injection to work efficiently, this emissions control technique can reduce the amounts of both unburnt fuel and oxides of nitrogen from entering the atmosphere. Unburnt fuel is pollution in the form of air-borne hydrocarbons, while oxides of nitrogen (NOx gases) are a result of combustion chamber temperatures exceeding 1,300 kelvins due to excess air in the fuel mixture and contribute to smog and acid rain.

Jun 16, 2010 | 2003 Cadillac CTS

1 Answer

My 2005 Sante Fe hesitates and won't get up to speed whenever it is damp or rainy outside. What causes this? Thanks


It could be your MAF (Mass Air Flow) sensor. Do you have any SEL {Service Engine) light coming on?

A mass air flow sensor is used to find out the mass of air entering a fuel-injected internal combustion engine. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature, altitude and use of a turbocharger and this is an ideal application for a mass sensor. (See stoichiometry and ideal gas law.)
There are two common types of mass airflow sensors in usage on automotive engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with an additional sensor or two, the engine's air mass flow rate can be accurately determined.
Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0.0- 5.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings.
When a MAF is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass.

May 27, 2010 | 2006 Hyundai Santa Fe

2 Answers

MAAS AIR SENSOR


A mass air flow sensor is used to find out the mass of air entering a fuel-injected engine. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature and altitude, and this is an ideal application for a mass sensor. (See stoichiometry and ideal gas law.)
There are two common types of mass airflow sensors in usage on gasoline engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with an additional sensor or two, the engine's air mass flow rate can be accurately determined.
Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0 - 5.0 volt or a PWM signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings.

Nov 09, 2009 | 1999 Oldsmobile Silhouette

2 Answers

No power with a 5.4 liter


P0171 and P0174 is a lean condition in your air/fuel ratio. This is common to a dirty MAF, IAT Sensor. You can buy a can of MAF sensor cleaner at Auto Zone or any other large auto parts store and just follow the instruction on the can. IF the reading from the MAF and IAT sensor's are incorrect, the PCM is thinking that the engine is getting to much gas so it's leaning the air/fule mixture out to much and your getting the dtc code for a lean mixture in your engine. That is causing you the lack of power since your not getting the right amount of air/fuel ratio in your engine which should be 14.7:1, anything more then that will be at a lean condition and prone to knocking (detonation) or miss fire. Good luck and hope this helps. keep me posted. be glad to help

Jun 08, 2009 | 2006 Ford F 350 Super Duty

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