Question about 1998 Chevrolet Malibu

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Just bought a 1998 malibu the engine light came on the dealership now wants $400 to replace a valve that regulate the fule and air mixture. Can you tell me what this valve is called and does it affect anything other than gas mileage.

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  • tonya_hawkin Apr 29, 2010

    I don't have the code but this has helped me a lot.

    Thank you

  • tonya_hawkin Apr 29, 2010

    Thank you

  • yadayada
    yadayada May 11, 2010

    there is not a valve that regulates fuel and air misture, get the correct name of the part or the fault code the engine light set in memory, the fault code is the best info..

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Fuel pressur regulator? egr valve is common on these as to clogging up in the passage although this is related to emissions and not so much fuel. do you have the code it set?

Posted on Apr 28, 2010

  • TripleTauto
    TripleTauto Apr 29, 2010

    IF you get the fault code i can help you further. autozone offers free code reading or call dealer and have them explain better wht you need.

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Related Questions:

1 Answer

Runs then floods itself out


what type vechicle many things cause rich fuel mixture check code if you see check engine light flashing could have bad sensor like map sensor faulty egr valve faulty mass air flow sensor.faulty oxygen sensor.weak ignition coil.bad fuel pressure regulator.if you have carburetor engine could have stuck closed choke valve or float in carb gas soak sticking causing engine flood.

Apr 25, 2013 | Cars & Trucks

1 Answer

Fuel air mixture too rich on a 98 nissan pathfinder


My guess would be a fuel injector or fuel pressure regulator problem, or a Mass air flow sensor.
The O2 sensor does not come into play until the engine has run for a couple of minutes.
Is the check engine light on ?

Sep 10, 2012 | 1998 Nissan Pathfinder

1 Answer

Its ideling to high getting too much gas how do you turn it down some


Hi.

Since the car is electronic injection and not carb engine you cannot regulate the idle manually. The idle fuel mixture to be injected is automatically determined by the ECU (the car main computer) depending on the inputs delivered from different parts. If the car is idling too high it means that there is a defective part.

Parts that must be tested are the following:

Idle air control valve and solenoid, also called IAC valve. The part is located on top of engine and determines amount of air to be injected when idle.
Vacuum system. The system has many different functions. Test the system for leaks that may result in lean mixture and other collateral problems.
O2 Sensors located in the exhaust system.
Air filter.
MAF sensor and IAT sensor located in the air intake.
Throttle position sensor.

Do also a diagnostic trouble code scanning. If there are codes stored they will help to identify the problem.

Regards.

Ginko

Aug 20, 2011 | 1998 Saturn SL

1 Answer

I have a 1999 chevy malibu - 45000 mi. Took to auto zone for computer reading and replaced O2 sensor that the dealer replaced with the fuel filter. about 145 miles while accelerating up a moderate hill...


The 02 sensor is detecting a malfunction in the emissions. That would be from a bad fuel mixture, too rich or too lean caused by dirty or faulty injectors or MAF sensor. A clogged catalytic converter will also cause it. Connect a manual fuel gauge to the fuel rail and test your fuel presuure. Test your fuel pressure regulator, the fuel pressure should increase 5-10 pounds when you disconnect the regulator...if it don't, the regulator is bad...Check for vacuum leaks and stuck or dirty egr valve. This would cause a lean condition. Check your air filter. Good luck, i hope this helps.

Jul 17, 2011 | 1999 Chevrolet Malibu

1 Answer

Keeps giving P0171 reading any help


P0171- System Too Lean (Bank 1)

The adaptive fuel strategy in the vehicle's computer constantly monitors the fuel delivery system to make sure the engine is running at an optimum air to fuel ratio, which is 14.7:1. The computer adjusts injector pulse width to regulate the amount of fuel going into the engine. The oxygen sensors relay information to the Powertrain Control Module (computer), informing it of the oxygen content in the exhaust. This information is translated by the computer, and used to determine if more or less fuel is needed. The computer will then adjust fuel flow (and possibly other related engine operating characteristics), to keep the correct air fuel mixture. This loop continues as long as the engine is running.

A P0171 check engine light code is set when the computer has reached a rich calibration limit and can not add enough fuel to maintain the correct mixture.

Possible Causes:
The following is an overview of P0171 check engine light code possible causes.

Fuel System:

Leaking or faulty fuel pressure regulator
Plugged or dirty fuel filter or lines
Fuel pump weak or defective check valve
Injectors leaking or faulty
Low fuel pressure or running out of fuel
Leaking EVAP system components
Faulty FRP (Fuel Rail Pressure Sensor)

Air Intake System

Vacuum leaks
Contaminated, damaged or faulty Mass Air Flow sensor
PCV valve leak or stuck open
Air induction turbulance caused by wrong filter
Oil dipstick not seated
Air leaks after the Mass Air Flow Sensor (MAF)
Oil coated aftermarket air filter

Exhaust System

Any exhaust leak before or near the oxygen sensors

EGR System

Vacuum line disconnected from EGR System Module (ESM)
EGR valve, tube or gasket leak
EGR vacuum regulator valve leaking

Secondary Air Injection System

Mechanically stuck secondary air injection valve

Diagnostic Help:
A very thorough discussion of how to approach and repair a P0171 check engine light code can be found here. If you need further assistance let us know. Please be sure to stop back in and visit some of our other very useful site features to lear more about your car's emissions system.

Hope this helps (remember to rate this answer).

Jan 22, 2011 | 2000 Volkswagen Beetle

1 Answer

My check engine light is on and I had it checked at


the iat sensor(intake air sensor) it is in big hose from air cleaner and has a 2 wire plug on it.iat sensor monitors tempurature of air entering engine. the pcm uses this info, to balance air and fuel mixture. if bad it can cause; poor idle when cold, stumble on cold excelleration, and surging when engine is warm. I replaced the iat on my malibu and it was less then 20.00, any auto parts store shold have this, I know advance auto does. the sensor just pulls out from hose.

Apr 19, 2010 | 2000 Chevrolet Malibu

1 Answer

Mazda protege 1998


Black smoke means the air/fuel mixture is too rich. Try checking the fuel pressure regulator for leaks by disconnecting the vacuum line while the engine is running this could be the potential cause. Also check the spark plugs and replace them, they are probably fouled.

Mar 04, 2010 | 1998 Mazda Protege

1 Answer

Diagnostic warning light.....diagnostic done at kia dealer... no obvious but told it might be mixture problem as they had seen same before. Any ideas?


Hi.

Mixture problems can be caused by a number of factors and faults. A computer module, the PCM, determines the mixture using data from different sensors. Re-circulated gas is also used to determine the mixture.

If the problem only happened at cold, then check the MAF (mass air flow) and (IAT intake air temperature) sensor, and also have the vacuum system tested for leaks, hat can affect the mixture and make a difference, particularly when idling.


If the problem reported by the error code was mixture related, then a common cause is often the EGR valve, that regulates gas re-circulation. In this case the engine will be running rough at idle and when driving.


More problems that can return mixture related codes can concern:
Fuel injector problems (voltage , leaking injector, dirty injector). In that case more codes may be returned. Excessive or insufficient fuel pressure due to fuel lines, pump problem, or bad fuel pressure regulator. Gas recovery system, vacuum leaks and EGR valve. Air leaks from air intake mainfold (after sensor), or defective MAF, IAT. If sensors are faulty, then you will get more codes. If the car recently runt out of fuel, or if the fuel cap is defective you can also get an error related to mixture. Exhaust leaks before reaching the O2 sensors. Timing problem.


If the only problem was a mixture related problem, then wait to see if the code comes back. The engine warning light will turn on. In that case check for additional codes and report the code here.

Things are different if there are more codes. Also there are differences if the mixture is too rich or poor.


Regards.

Feb 04, 2010 | 2004 Kia Rio

1 Answer

I have an 98 Chevy malibu and it has a rough idol, while it is in park. I can't figure what is the problem. Can you please help me out.


you must check these.
1- IAC
2- injecters
3-valves cylinder
4-fule pressure
5-coil ignition
6-bult timing

Nov 22, 2009 | 1998 Chevrolet Malibu

1 Answer

Check engine light is on


There are many causes to this problem, but you might need to take it to a shop to find the real problem.
Here's everything I know about it.
P0171 System too Lean (Bank 1)
How does a P0171 code trigger the check engine
light? This code will trigger the check engine light as follows:

The adaptive fuel strategy in the vehicle's computer constantly monitors the fuel delivery system to make sure the engine is running at an optimum air to fuel ratio, which is 14.7:1. The computer adjusts injector pulse width to regulate the amount of fuel going into the engine. The oxygen sensors relay information to the Powertrain Computer Module (computer), informing it of the oxygen content in the exhaust. This information is translated by the computer, and used to determine if more or less fuel is needed. The computer will then adjust fuel flow (and possibly other related engine operating characteristics), to keep the correct air fuel mixture. This loop continues as long as the engine is running.

A P0171 check engine light code is set when the computer has reached a rich calibration limit and can not add enough fuel to maintain the correct mixture.

Possible Causes:
Fuel System:

Leaking or faulty fuel pressure regulator
Plugged or dirty fuel filter or lines
Fuel pump weak or defective check valve
Injectors leaking or faulty
Low fuel pressure or running out of fuel
Leaking EVAP system components
Faulty FRP (Fuel Rail Pressure Sensor)

Air Intake System:

Vacuum leaks
Contaminated, damaged or faulty Mass Air Flow sensor
PCV valve leak or stuck open
Air induction turbulence caused by wrong filter
Oil dipstick not seated
Air leaks after the Mass Air Flow Sensor (MAF)
Oil coated aftermarket air filter
Exhaust System:

Any exhaust leak before or near the oxygen sensors

EGR System

Vacuum line disconnected from EGR System Module (ESM) EGR valve, tube or gasket leak
EGR vacuum regulator valve leaking

Secondary Air Injection System

Mechanically stuck secondary air injection valve

Apr 12, 2009 | 2000 Hyundai Sonata

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