Question about 1998 Chevrolet S-10 Pickup

1 Answer

I unplugged the Mass Airflow Sensor and my truck runs better. I'm told by parts suppliers there is no Mass Airflow Sensor. What part did I unplug and will it damage the engine to run without it?

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 771 Answers

Most likely if there is no mass air sensor you actually unplugged the inlet air temperature sensor IAT. This is a little bead like thermistor that sits in the ducted air stream to measure incoming air temperature. Without an air mass sensor your engine will have instead a manifold absolute (air) pressure MAP sensor. This measures the absolute air pressure (the difference between the atmospheric air pressure outside and the drop in pressure inside) in the inlet manifold. The drop in pressure in conjunction with air temperature allows the engine control unit to calculate the amount of air in the engine to which it adds the correct amount of fuel per each injection cycle. The loss of the IAT signal is not critical as the ECU will assume a default value. However when extreme low temperatures are encountered the absence of the IAT may be become noticeable as the charge of air entering the engine will be denser and as a consequence the fuel mix will be much leaner; maybe to lean to start up.

Posted on Sep 08, 2010

Testimonial: "Very helpful!! Gave me info that parts suppliers didn't have."

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I have a 98 Nissan Frontier. It wasn't running right so I unplugged the maf sensor and it ran better. I bought a new one from eBay. Replaced it and now it's running worse than before


    What Are the Symptoms of a Faulty Mass Air Flow Sensor?
    • The engine stalls soon after starting.
    • The engine drags or hesitates when idle or under load.
    • The engine hesitates and jerks during acceleration.
    • The engine hiccups.
    • The engine displays unusually lean or rich idling.

    Mass Airflow Sensor: An Easy Fix for Big Problems from a ...

    www.airtexproducts.com/news-blog-mass-airflow-sensor-an-easy-fix-for-bi...

Sep 24, 2015 | Nissan Cars & Trucks

1 Answer

2001 dodge ram stalls while driving


Make sure you don't have any vacuum hoses of on the intake. If that doesn't work check mass airflow sensor. Unplug sensor if it run better with out the sensor being plugged in the replace. You can blow the sensor out with mass air flow sensor but I have not ha the best luck with this product.

Mar 07, 2015 | Dodge Ram Cars & Trucks

1 Answer

Park avenue 1999 cuts out while driving


try unplugging mass airflow sensor on the air filter duct if it runs better replace

Mar 06, 2015 | 1999 Buick Park Avenue

1 Answer

Runs rough when cold and stalls how do I fix it


If it runs ok when its warm you may need a new Idle air control or IAC...what it does is adds fuel when the car is cold to help it run smooth until it warms up...kinda like a choke on a lawn mower or other small equipment. There should be a sensor on the throttle body....with the car running, unplug the sensor...if it runs differently its probably ok...if it runs the same when unplugged...its probably bad.
Another thing to check is the mass airflow sensor....which is usually in the tube that goes to the airbox. If you locate the mass air sensor, either remove the sensor or remove the tube and look down it....you should see a "needle" sticking down into the tube...sometimes in the middle of a screen or honeycomb..thats the mass air sensor...buy a can of Mass Airflow Cleaner at the auto parts store and follow the direction....they are very delicate so be careful.
If I had to bet...I would say its you IAC.

let me know

Jan 14, 2015 | 1996 Nissan Pickup

1 Answer

Audi a4 56plate . when putting the thruttle down the car shutters, hesitates


Try unplugging the Mass Airflow sensor and see if the car runs better, if it does replace the MAF sensor. It is located in the air intake hose to the engine.

Feb 16, 2012 | Audi A4 Cars & Trucks

1 Answer

My 1991 240DL volvo has a hard start, and while idling, goes up and down, then eventually stalls out. The air flow sensor/air mass meter? was unhooked, and the car idled smoothly. Is it true that the car...


When you unplug the mass airflow sensor, the car goes into "limp home" mode in which it runs full rich. Generally speaking, if a car runs better with the mass airflow sensor unplugged than with it plugged in, the mass airflow sensor has failed.
However, the drifting idle tends to make me want to look for vacuum leaks and check the rear temperature sensor on the driver side of the head. I suspect that running over-rich is compensating for the vacuum leak so the car keeps running.
If you have a propane torch or a can of diesel starting ether, spray it around the intake manifold while the car is idling and see if the engine speeds up. If so, then you have found a vacuum leak.
If it were mine, I would buy a new intake manifold gasket and replace it as a routine maintenance item. It is not expensive or difficult to replace except that if you are like me, you WILL drop at least one nut, and there are several great hiding places on that side of the engine where the nuts go to hide when you drop them. You will need a magnet to recover them. You don't need to pull the manifold clear off, you just have to pull it clear of the bolts so you can slip in a new gasket. You can leave the throttle cables and most of the other connections hooked up
If you know how to use an ohm meter, you might consider getting a manual for this car and looking up the appropriate resistance/temperature values and checking that rear temperature sensor.
While you are replacing that intake manifold gasket, check all the vacuum ports to make sure they are clear, and check all the vacuum hoses to make sure they are intact. Also check the tubes between the mass airflow sensor and the throttle body for cracks. While you have those air tubes off, clean the throttle body and the idle air control valve with some carb cleaner. Spray a little carb cleaner through the mass airflow sensor as well. Actually, there is a special spray for cleaning mass airflow sensors that is more gentle, but I have used carb cleaner on them many times with no apparent ill effects.
If it turns out that the mass airflow sensor has failed, that will run some $$, but having a fresh intake manifold gasket and clean throttle body and no vacuum leaks will be worth your time and money and make the car run better when you are done.

Jun 07, 2011 | Volvo 240 Cars & Trucks

1 Answer

1999 mazda protege when starting of at a slow speed the car starts to buck and o/d light will flash


The tube after the air filter might be cracked (Fix it). Next the you will see the Mass Airflow Sensor. Unplug that and see if you car runs differently (better while driving, worse while idling). If so then it is definitely the MAS (Mass Airflow Sensor). There is actually a recall on this part (at least, for the 2000 Protege). Also, try cleaning it and plugging it back in. Change spark plugs (OEM only, nothing fancy). Also, some gas does this worse than others.

Jan 26, 2010 | 1999 Mazda Protege

1 Answer

I have a 2002 bettle it starts and then dies


could be your mass airflow sensor. unplug it. if it runs better then you need a new one! could also have a major boost leak which cause ur car to cut off!

Oct 01, 2009 | 2002 Volkswagen Beetle Turbo S

2 Answers

Missfire and smell of gas


Unplugging the mass airflow sensor may be ok to do just to get you back home,,but it is not wise to leave it unplugged,,because your engine control unit cant decide just how rich or lean to make the fuel mixture without it.
A smell of gasoline is usualy a sign of this.

Jan 17, 2009 | 1994 Ford Thunderbird

Not finding what you are looking for?
1998 Chevrolet S-10 Pickup Logo

1,167 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

76691 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8531 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...