Question about 1999 Chevrolet Malibu

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My 02 impala needs excessive fuel all of a sudden. the MAS sensor and air filter was replaced recently. It also runns a little hotter then usual

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The O2 sensor should be replaced as a precaution, running hotter indicates a lean air/fuel mixture, the car should be throwing aOBD II code have the codes checked at Autozone to confirn the Oxygen sensor is bad it should read something like bank one sensor or O2 sensor malfunc.

Posted on Jul 14, 2009

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I have a 02 3.4 chevy impala. my check engine light is on for a bank one o2 sensor. iv replaced the upper and lower o2 sensors twice this week and code is still coming up.also when im driving it feels like...


i would suggest checking fuel pressure and fuel filter could have little dirt or something clogging fuel and engine light will stay on due to too rich or too lean of fuel/air mixture

Oct 08, 2013 | Cars & Trucks

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My 1997 Ford Taurus stalls when I accelerate. It only happens about 5 to 10 minutes into my drive. It starts up fine. If I am driving and the car stalls on acceleration, I can turn the car off and back...


Replace first, the fuel filter if this has not already been done. You may have a plugged filter, and these are very inexpensive. If this does not resolve the issue, locate the MAS (mass airflow sensor) located between the throttle body and the air filter housing. Start the car and let it idle normally; with a screwdriver handle or other such small tool, tap the mass airflow sensor (small black unit; will have a wiring harness hooked to the side of it); if the car dies, stalls, hesitates; first purchase MAS cleaner at the local auto parts dealer - specifically ask for Mass Airlflow Sensor Cleaner. It will should cost between 7-12 bucks - but you wont need the whole can - however, when using it: (if the car does not die, stall or hesitate and the idle stays the same, than the sensor is not bad) If it does however:
1. Remove the MAS (disconnect wiring harness) you may need to pull the top end of the air filter housing off.
2. Spray inside the sensor generously from both ends ensuring it's entirety is sprayed. Let stand for 15 minutes to airdry.
3. Re-install the sensor and start car. If there is still no improvement and the car hesistates, 1. Ensure the air filter as well is in good repair, and that there is nothing causing any air flow restriction between the airfilter and the throttle body.
4. If the airfilter is good, and there are no restrictions to air flow, consider replacing the MAS, however if you can get the car to the auto parts dealer, or to a technician (who may charge; auto parts dealers usually don't) have them run a diagnostics test on the car.
5. At this point, if cleaning the sensor has made no improvement, and the car stays idling, does not hesitate when tapping the sensor, the air filter is good, the fuel filter is good - then the next step is to replace the fuel pump.
Please let me know if you need further assistance.
carsandcomps,

Sep 26, 2011 | 1997 Ford Taurus

1 Answer

2002 impala 3.8L 180,000kms. Having problems with car hesitating on acceleration(not all the time). Had maf sensor & idle air control sensor replaced recently. Fuel filter, air filter,new plugs &...


it is possibly the throttle position sensor(tps) malfunctioning. basically the computer or "brain" of the car thinks the throttle is in a different position than it really is and automatically makes adjustments to fuel, air ect.... based on these false readings from the sensor thus causing the engine to react a little different when you expect to have power.

May 14, 2011 | 2002 Chevrolet Impala

1 Answer

Emiting black smoke


You have not indicated year or model so the basic answer is as follows. Black smoke usually indicates an excessively rich fuel air mixture associated with excessive fuel consumption.
It can usually be caused by a clogged air filter. The filter can be checked after removal from the air filter box by shining a torch through the element material. If the torchlight can be seen it is OK to be reused but if little or no light is visible then filter must be replaced.
For carburettor engines it could mean a stuck choke or the carby float level is too high caused by a worn needle and seat. For Fuel Injected engines it could be caused by incorrect fuel pressure, leaking injectors, a faulty Oxygen sensor or a faulyty coolant temperature sensor.

Dec 20, 2010 | Toyota RAV4 Cars & Trucks

1 Answer

Car has a very rough iddle when cold but fine when warm. Misfires at 4,000rpm and won't go any higher. Was converted to manual by previous owner. Any ideas why? done plugs and fuel filter, diagnostic...


the problem may be in the mas. Mas Airflow Sensor. Locate on the air filter or in the line between the throttle body. Usually when these go out the car won't rev up very quick. if you slowly press on the gas pedal the rpm's will climb a little at a time. Hope this is helpful.

Sep 25, 2010 | 1991 Subaru Legacy

2 Answers

Car bucks and stalls unless mass airflow sensor is disconnected. Changed airflow sensor and temperature sensor. Also changed air filter. Engine light remains on.


Clear and recheck your codes. You may have another problem that taking off the MAS is masking. Throttle position sensor being stuck is a common issue as well.

With the MAS off the car goes into "limp home mode" and everything gets set to base settings with no active input from sensors.
Also check your fuel pressure on the fuel rail.

Good luck and be careful.

Jun 29, 2010 | 2003 Chevrolet Impala

1 Answer

I have a honda accord 2003 model 2.3 16 valves engine the problem is that when the engine gets warm up after five or six kilometres the engine gets off while braking or shifting the gear


Does the engine shut off?

Try replacing the air an fuel filter - also tap on the MAS (mass airflow sensor) which is located between the air filter casing and the intake (throttlebody) - if the car dies, hesitates it may need to be replaced.

First, do the air and fuel filter. If this does not solve the problem, then purchase MAS cleaner. Pull the unit out and spray the inside generously with the cleaner. Re-install and drive. If the problem still exists, try replacing the MAS.

If not this, it could be either the crankshaft sensor, cam shaft sensor, harmonic balancer, O2 (oxygen) sensor(s), or the catalytic converter may be plugged.

Take the car first to an auto parts dealer (Napa, Baxters, etc) and have them run a diagnostics test to determine any codes that will let you know what components may be malfunctioning, not working, and need replaced.

Please let me know if you need further assistance.

carsandcomps,

Guru, Premium Expert @ Fixya.com

Jun 22, 2010 | Cars & Trucks

1 Answer

94 toyota land cruiser runs rich, rough idle, no power


You have a fuel injected car. Things that can cause too rich would be a bad altitude sensor like the map or mass air flow depending on which one you have.
Anything that would cause excess air to go into the exhaust system like a cracked exhaust pipe before the 02 sensor, or low compression, or a stuck open pcv valve, intake gaskets, throttle body base gasket.
Or a Throttle position sensor which is telling the computer you foot is on the gas when it is not.
Its possible you have a bad PCM,, or coolant temp sensor saying the motor is still cold as its warming up.
Its possible you have a vacuum hose somewhere on the engine with a big crack in it or its just inplugged and you dont see it.

But my first guess would be possibly a bad computer.
Try creating a big vacuum leak when its loading up. It should run better.

Also if you have an egr valve it could be stuck open a little causing excess air or an idle air control valve stuck open.

Does it clean up if you rev it up or does it blow black smoke reved and at idle. This could point towards the altitude sensor.

Dec 22, 2009 | 1992 Ford Explorer

2 Answers

They said it was on o2 cencer now they say its the fuel filter!!!


Could be a couple of things. The sensors are a pain to troubleshoot. MAS/MAP or IAT sensor is a problem one also...it is the cheapest of the sensor.

Jul 14, 2009 | 2003 Ford Expedition

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