Help! mass airflow sensor

HEXABOT

New Member
Jul 8, 2019
2
0
1
32
LOS ANGELES
Well I don't really know if its the M.A.S. I will explain my problem now:

When I accelerate the car start to hesitate like its low of fuel but only when its waiting at a red light, I guess that was the air filter so I change it for a new one, after I try the car without the air filter and works well no hesitate or jerk even at a red light, then I put the new filter and the same problem comes. some one told me that can be that the mass airflow sensor could be dirty.

what do you think?

thanks for reading my post.

also there's a video in you tube of my problem

View: https://youtu.be/fA-O3163a7I
the problem with air filter

View: https://youtu.be/k-FEwjHBI7k
with out air filter
 
  • Sponsors(?)


wmburns

SN Certified Technician
Aug 14, 2009
5,811
499
164
Houston Texas
It is always a good idea (and can't hurt anything) to clean the MAF sensor. Always use a product designed for the job. The MAF sensor is easily damaged.

Do you have an ODB2 scanner? If you did, having access to operational PID's might make short work of your problem.

ForScan ODB2 scanner w ELM327 USB
 

ReefBlueGT

New Member
Oct 4, 2018
4
0
1
42
California
FWIW, I recently cleaned mine in a 93 5.0, and the car definitely runs smoother now. I couldn't tell how dirty it was before cleaning it, but once I had sprayed it down and let it dry, it was apparent that it had been pretty filthy, since the wires on the sensor looked much smaller and pristine afterwards. There was also a film on the mesh screen in front of the sensor. Wasn't having significant driveability problems, but it's a cheap and easy thing to do, and can't hurt - just make sure you do it properly. I took out the entire metal piece between the filter box and the intake hose to the manifold when I did mine. That's how you can properly clean and flush it out while it's off the car, including that screen, and since you aren't removing the sensor by itself, I think it's safer.
 

HEXABOT

New Member
Jul 8, 2019
2
0
1
32
LOS ANGELES
Thanks I did that I buy the maf cleaner spray but it continues with the problem, also when the car is on I unplug the MAF sensor and the car keep working I saw on youtube that its suppose to turn off when its unplugged. I will buy the maf sensor it seems that's the only solution.

thanks for the answers
 

wmburns

SN Certified Technician
Aug 14, 2009
5,811
499
164
Houston Texas
I unplug the MAF sensor and the car keep working I saw on youtube that its suppose to turn off when its unplugged
Not true. Unplugging a MAF sensor will not make the car stop. If unplugged the PCM will substitute default values based upon other sensor values. In fact, unplugging the MAF is a valuable trouble shooting tool. If for example unplugging the MAF makes it run better, THEN this means there is some issue with the MAF.
 

Danny2v

Member
Jun 24, 2019
50
1
8
21
California
Not true. Unplugging a MAF sensor will not make the car stop. If unplugged the PCM will substitute default values based upon other sensor values. In fact, unplugging the MAF is a valuable trouble shooting tool. If for example unplugging the MAF makes it run better, THEN this means there is some issue with the MAF.
Although you are right about unplugging being a great way to diagnose, it does not mean that the MAF is automatically bad. Unplugging the sensor puts the car into open loop which stops using the MAF, O2, and all other monitors... So if you unplug and see it runs better, the next step is to figure out which sensor exactly is bad
 
Thread starter Similar threads Forum Replies Date
Z 95 5.0 Maf Not Working 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 3
G (Help) Car Wont Run : Mass Air Conversion 1986 Mustang Issues Fox 5.0 Mustang Tech 7
1989fiveohman Mass air meter help or advice needed Fox 5.0 Mustang Tech 55
U Need Some Help/advice On A Mass Air For My Car! Fox 5.0 Mustang Tech 4
M Mass Air Meter Help 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 10
Wicked50Chris Mass Air Sensor For A Tune Help Fox 5.0 Mustang Tech 40
Maryland Stang Need Help With My 95 F150 5.0 Mass Air 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 0
B speed density vs mass air?? help!! Fox 5.0 Mustang Tech 6
crazy98gt mass air conversion help! Fox 5.0 Mustang Tech 4
8 86 5.0 Mass Air Conversion HELP! Do I have cruise? Fox 5.0 Mustang Tech 14
wewfords injector/ mass air help Fox 5.0 Mustang Tech 4
B Help on mass air conversion 1987 Fox 5.0 Mustang Tech 2
S need help with 86gt mass air conversion Fox 5.0 Mustang Tech 21
Black1987 94 & 95 Mass Air. HELP!!! Please 1994 - 1995 Specific Tech 17
8 mass air upgrade help? Fox 5.0 Mustang Tech 2
H Help: Mass Air Flow Meter Fox 5.0 Mustang Tech 4
J Mass Air conv Help Fox 5.0 Mustang Tech 1
L MASS Air Conversion Please HELP! Fox 5.0 Mustang Tech 2
S mass flow help 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 0
V finished mass air conversion need some help Fox 5.0 Mustang Tech 6
86GT5speed need help with mass air conversion on 86 gt! Fox 5.0 Mustang Tech 13
B Please help identify Pro-M mass air meter... Fox 5.0 Mustang Tech 2
8 who knows their mass air stuff....air head needing air help...... Fox 5.0 Mustang Tech 0
Shrek86GT Mass Air flow Conversion Please help Fox 5.0 Mustang Tech 32
8 fusible link burning up while converting to mass air no start need help badly u know? Fox 5.0 Mustang Tech 1
M HELP need....changing over to mass air on 87 gt Fox 5.0 Mustang Tech 3
mustanglouie Got new mass air in but have a ? please help 1994 - 1995 Specific Tech 3
9 My MAFS (mass air sensor) just puked..Help SN95 4.6L Mustang Tech 6
N need help 80mm pro m mass air Fox 5.0 Mustang Tech 2
MAC'n89Blckstng Will a bigger mass air help with my combo? Fox 5.0 Mustang Tech 3
MAC'n89Blckstng Will bigger mass air help? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 0
P QUICK help with 76mm mass air and cold air kit Fox 5.0 Mustang Tech 6
9 mass meter upgrade need help on cai question Fox 5.0 Mustang Tech 2
Y mass air conversion HELP Fox 5.0 Mustang Tech 10
drakesdad mass air conversion HELP 1994 - 1995 Specific Tech 2
Black-Fifty Mass Air Conversion help... Fox 5.0 Mustang Tech 34
randyp83 Mass Air Meter Help! SN95 4.6L Mustang Tech 0
95Cobra302 Help With 3.8 Mass Air! 1994 - 1995 Specific Tech 7
N mass air system help Fox 5.0 Mustang Tech 2
B Mass air conversion Prolbems PLease help! Fox 5.0 Mustang Tech 1
sldghmr Mass air wiring help needed...... 1994 - 1995 Specific Tech 20
gcomfx.com Need help. Pro-M mass air to fender filter. 1994 - 1995 Specific Tech 2
88GThatchback Mass Air Connector Help Fox 5.0 Mustang Tech 4
L Help with mass air meter Fox 5.0 Mustang Tech 11
S mass air conversion link *help* Fox 5.0 Mustang Tech 2
A carb or mass air help Fox 5.0 Mustang Tech 5
evilwater mass air help Fox 5.0 Mustang Tech 1
L I dont know what to do!! Help me out here guys plz! (mass air) Fox 5.0 Mustang Tech 1
C Help me with how to clock my Mass air meter 1994 - 1995 Specific Tech 2
deadly97snake Please help ASAP I need a Stock Mass Air Sensor for 94GT Regional Forums and Event Information 4
Similar threads