http://www.wellsve.com/ Diagnosing GM Mass Air Flow MAF Sensors using a DVOM, Scan tool and Lab scope. In this video we explore alternative ways to determine…
http://www.wellsve.com/ Diagnosing GM Mass Air Flow MAF Sensors using a DVOM, Scan tool and Lab scope. In this video we explore alternative ways to determine…
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2000 silverado I have no codes, no short term fuel read, long term is -10%
and MAF reads idle at any throttle position. 2.404 volt. At 2000 rpm I get
random misfire codes
good video It covers some things I haven’t seen before.
I saw a Bergwall video that showed a Mastertech scan tool displaying engine
load as a percent. Percent of what? I don’t know for sure, but I am
guessing that from a purely academic perspective, engine load is a measure
of force which could be expressed in newton-meters. And engine vacuum is
directly proportional to this force. Now, if engine load is displayed as
100%, then what is the corresponding engine vacuum reading and force
measurement?
In 1822, Joseph Fourier, a French mathematician, discovered that sinusoidal
waves can be used as simple building blocks to describe and approximate any
periodic waveform including square waves.
I am going to assume you have a 4.3 engine. I also need to know the
problem, lacking power etc. Could the MAF cause this? Yes. It is a digital
MAF. The best way to test it we show in the video, by tracing. A voltage
reading will tell you nothing. Other common causes are fuel pump ( check
fuel pressure under load) catalytic convertor, Dist. Cap and rotor and
injectors (spider type). You can always give us a call at 1-800-558-9770
M-F 7 -7 CST. Mark Hicks Wells Vehicle Electronics
1:08 Once again, does the MAF produce a sine wave or a square wave. The
picture at 1:08 is a square wave, and yet the narrator keeps refering to a
sine wave.
i have a 96 tahoe and changed the mass air sensor because the truck kept
shutting off at start up and code was for maf. after i installed new maf it
ran great for about 45min then went back to shutting off and rough idle . i
went online and someone said to check egn1 fuse> it was blown then i
replaced it> it last for 30min then blew again it keeps blowing that fuse
what do i do??? any ideas?? thank you!!
Can’t you just spray the MAF sensor with MAF cleaner?
There are six wires in the bundle you accessed to measure MAF frequency,
are you on the green wire? Thanks
I believe it would be a percentage of maximum or perceived max. if engine
load is at 100% the vacuum reading would be zero.
It has been a while since we produced this video, but if I remember
correctly it is the green wire on this vehicle. Mark Hicks Wells Vehicle
Electronics
@mpcross06 I have a feeling you are no novice! Thank you for the kind
words. One video for every code….now there is a challenge I like! Take
care, Mark Hicks Wells Vehicle Electronics
@polarisforlife1 I can help you with possibilities and a test procedure,
but i need you to provide the code number. Mark
i have a 96 chevy pick up with 5.7l 350 vortec i ran the codes on the truck
and it said the mass airflow wasnt working and that was why my check engine
was on i replaced the part and the check engine is still on and i ran the
codes again to see what it was and it said it was the maf can u give a
solution to why the check engine light wont go off
i have the same truck same problem hz is closer but st trm avg1 % does not
move 0-200 mark possibly different with solus?? maf gm/sec 8.71-8.62
maf(hz)3075 maybe vaccum leak dtc sets after long idle time or accel
@polarisforlife1 Ive had the same problem with mine the wiring harness
conectors get old and dont conduct well try replacing the end it fixed mine
yeah it dosent move very often i have ve tables modified thru efi live i
might try going back to the stock tune file i dont really have any
driveability issues just a po101
Thank you George…if it is at all possible, the next time you get a
similar reading save it and send it to me for the records. It will help us
determine if this is a defined way to check digital MAFs. Take Care, Mark
i have had similar readings on my scan tool with malfunctioning maf sensors
on older model B body cars
Not on this type of MAF. If it were a hot wire type you could. Mark Hicks
Wells Vehicle Electronics
The yellow trace is the MAF. What is the green trace above it?
i have a 96 tahoe and changed the mass air sensor because the truck kept
shutting off at start up and code was for maf. after i installed new maf it
ran great for about 45min then went back to shutting off and rough idle . i
went online and someone said to check egn1 fuse> it was blown then i
replaced it> it last for 30min then blew again it keeps blowing that fuse
what do i do??? any ideas?? thank you!!
@DMM9786 Both the Mass Air Flow (MAF) and Cam sensor get power from the
under hood fuse block ENG1 fuse. Inspect for a blown fuse. Replace fuse, if
blows again disconnect the heated O2 sensors. Replace sensor causing fuse
to blow, inspect wiring to sensors. Inspect wiring to the vent solenoid,
purge solenoid, Exhaust Gas Recirculation (EGR) valve MAF and distributor
cam sensor. I hope this helps,,,stay in touch, please let me know what
happens, Mark Hicks Wells Manufacturing L.P.
@shrEDinsince82 Did you trace the fuel trims like in the video? If they are
flat like in the video chances are you have a defective MAF. What DTC is
setting? Mark Hicks Wells Vehicle Electronics
Thank you for the kind words. Our goal was to show an alternative way to
diagnose digital MAF sensors. Let me know if you ever use the technique and
how it turns out. Take Care, Mark Hicks Wells Vehicle Electronics