Mass air sensor

kenneth kimble · 06-27-2002, 09:27 PM

What is the correct step for checking the Mass air sensor. My car is falling on it face at 3/4 throttle, but runs fine below 3/4 throttle

306 xcam tfs head 14# procharger

kenneth kimble · 06-28-2002, 05:52 PM

can anybody help!?!?!?!!!!!!!!!!!!!!!???

Mr 5 0 · 06-28-2002, 10:15 PM

Do a code scan.

Look for 26 (bad MAF) or possibly 56 or 66 (MAF too high or too low).

There are other tests but you need more sophisticated equipment.
If it throws a MAF code, replace the sensor.

Meanwhile, a careful cleaning of the MAF hotwire (disconnect battery first, let the wire cool and use a Q-tip moistened with alcohol to clean it, being very gentle) may help, if it's at all contaminated.

Mopar1 · 06-29-2002, 09:50 AM

Mr 5.0

If it throws a MAF code replace it? Igot the code that said MAF signal low . So should I replace the MAF

LX5liter · 06-29-2002, 12:35 PM

Its probably not your MAF as it does not read throttle position, only the mass of air that is flowing into the engine. Have you checked your TPS?

sn95gt19 · 06-29-2002, 12:47 PM

actually, the mass air and the tps work together. i have had mass airs go bad on 3 of my mustangs, and 3 of my buddys stangs. that was the problem with all of them. actually just fixed one yesterday on a 92lx, the car wouldnt get out of its own way, then when we replaced the mass air, it screamed like a 12 yr. old at a backstreet boys concert.

Mopar1 · 06-29-2002, 01:49 PM

"like a 12 yr old at a backstreet boys concert"

hahahahahaha

Mr 5 0 · 06-29-2002, 02:33 PM

Kenneth:

I recommended replacing the MAF sensor as the quick and easy way of resolving the problem but of course it's expensive.

I assume you've already checked the TPS voltage for a steady climb as you open the throttle to max (engine off) and it's normal, right?

If so, put the MAF put on a tester and check the current output. In the case of a failed MAF sensor, the computer (ECM) will go to a backup strategy, using the TPS signal to create a MAF signal of its own. That's why you need a full array of test equipment to check all aspects of the MAF/TPS operation.

A good shop will have this equipment and know how to use it. It shouldn't cost too much (under $75.) to have it done.

There's a good chance the MAF sensor is defective but of course I have no way to guarantee that it is. Just making semi-educated guesses, from a distance, without any equipment and trying to at least point you in the right direction.

kenneth kimble · 06-30-2002, 07:24 AM

thanks guys, I well scan the car for code today. I well let, you guys know what comes up.
ken

06-27-2002, 09:27 PM	#1
kenneth kimble Registered Member Join Date: Apr 1999 Location: chesapeake va. Posts: 89	Mass air sensor What is the correct step for checking the Mass air sensor. My car is falling on it face at 3/4 throttle, but runs fine below 3/4 throttle 306 xcam tfs head 14# procharger

06-28-2002, 05:52 PM	#2
kenneth kimble Registered Member Join Date: Apr 1999 Location: chesapeake va. Posts: 89	Sn6V23 can anybody help!?!?!?!!!!!!!!!!!!!!!???

06-28-2002, 10:15 PM	#3
Mr 5 0 Conservative Individualist Join Date: May 1997 Location: Wherever I need to be Posts: 7,487	MAF testing Do a code scan. Look for 26 (bad MAF) or possibly 56 or 66 (MAF too high or too low). There are other tests but you need more sophisticated equipment. If it throws a MAF code, replace the sensor. Meanwhile, a careful cleaning of the MAF hotwire (disconnect battery first, let the wire cool and use a Q-tip moistened with alcohol to clean it, being very gentle) may help, if it's at all contaminated.

06-29-2002, 09:50 AM	#4
Mopar1 Registered Member Join Date: Mar 2002 Location: Lakewood, Wa Posts: 161	Mr 5.0 If it throws a MAF code replace it? Igot the code that said MAF signal low . So should I replace the MAF __________________ '77 Aspen R/T: 318 w/273 heads, 4spd, Hurst Shifter, 600 holley, edelbrock intake, 8 3/4 axle, 3.23 sure-grip, dual 3" exhaust, MP cam 276 / 276 duration 490 / 490 mech solid lifter, Super Stock Springs (15.65@88 3900lbs) '91 Mustang LX: .030 Bored, Typhoon Intake, 4.10's, Lentech VB, BBK 70mm TB, FMS A/C elim bracket, 19lbs inject, off road H-pipe, 75mm pro-m MAF, FRP unequal shorty, stormin normin hood. 3420 Lbs w/ 220 (me) and 13 gal gas. '02 SS Camaro

06-29-2002, 12:35 PM	#5
LX5liter dude5l Join Date: May 2001 Location: Grande Prairie, Alberta, Canada Posts: 603	Its probably not your MAF as it does not read throttle position, only the mass of air that is flowing into the engine. Have you checked your TPS? __________________ Good luck! Brad R. 1992 L.X. 5.0 coupe MODS: A few little bolt ons New Best time ...11.60 @ 128 mph @ 2000+ ft altitude. Rice Haters Club member #39 Users rides #2542

06-29-2002, 12:47 PM	#6
sn95gt19 motors done......woohooo Join Date: Mar 2002 Posts: 799	actually, the mass air and the tps work together. i have had mass airs go bad on 3 of my mustangs, and 3 of my buddys stangs. that was the problem with all of them. actually just fixed one yesterday on a 92lx, the car wouldnt get out of its own way, then when we replaced the mass air, it screamed like a 12 yr. old at a backstreet boys concert. __________________ 95gt lazer red (98 cobra clone) Rice Haters Club Member #116

06-29-2002, 01:49 PM	#7
Mopar1 Registered Member Join Date: Mar 2002 Location: Lakewood, Wa Posts: 161	"like a 12 yr old at a backstreet boys concert" hahahahahaha __________________ '77 Aspen R/T: 318 w/273 heads, 4spd, Hurst Shifter, 600 holley, edelbrock intake, 8 3/4 axle, 3.23 sure-grip, dual 3" exhaust, MP cam 276 / 276 duration 490 / 490 mech solid lifter, Super Stock Springs (15.65@88 3900lbs) '91 Mustang LX: .030 Bored, Typhoon Intake, 4.10's, Lentech VB, BBK 70mm TB, FMS A/C elim bracket, 19lbs inject, off road H-pipe, 75mm pro-m MAF, FRP unequal shorty, stormin normin hood. 3420 Lbs w/ 220 (me) and 13 gal gas. '02 SS Camaro

06-29-2002, 02:33 PM	#8
Mr 5 0 Conservative Individualist Join Date: May 1997 Location: Wherever I need to be Posts: 7,487	MAF testing Kenneth: I recommended replacing the MAF sensor as the quick and easy way of resolving the problem but of course it's expensive. I assume you've already checked the TPS voltage for a steady climb as you open the throttle to max (engine off) and it's normal, right? If so, put the MAF put on a tester and check the current output. In the case of a failed MAF sensor, the computer (ECM) will go to a backup strategy, using the TPS signal to create a MAF signal of its own. That's why you need a full array of test equipment to check all aspects of the MAF/TPS operation. A good shop will have this equipment and know how to use it. It shouldn't cost too much (under $75.) to have it done. There's a good chance the MAF sensor is defective but of course I have no way to guarantee that it is. Just making semi-educated guesses, from a distance, without any equipment and trying to at least point you in the right direction.

06-30-2002, 07:24 AM	#9
kenneth kimble Registered Member Join Date: Apr 1999 Location: chesapeake va. Posts: 89	SN6v23 thanks guys, I well scan the car for code today. I well let, you guys know what comes up. ken

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