Maf Sensor Throwing Code P0101,p0171?
Thread Starter
Teching In
Joined: Jan 2005
Posts: 20
Likes: 0
From: Canton, Ga.
Maf Sensor Throwing Code P0101,p0171? I JUST INSTALLED A GMS MAF SENSOR AND KEEP THROWING CODES. I DID A SEARCH AND READ UP. THEN READ UP SOME MORE. TIGHTENED EVERYTHING. CLEANED EVERYTHING. IDLE IS STUMBLING, TRUCK RUNNING LIKE ****! WHEN I FIRST INSTALLED TRUCK RAN GREAT FIRST 200 MILES THEN THE LIGHTS STARTED TO LIGHT UP. ANY IDEAS?? -FRUSTRATED 
Originally Posted by 04-NALI
I JUST INSTALLED A GMS MAF SENSOR AND KEEP THROWING CODES. I DID A SEARCH AND READ UP. THEN READ UP SOME MORE. TIGHTENED EVERYTHING. CLEANED EVERYTHING. IDLE IS STUMBLING, TRUCK RUNNING LIKE ****! WHEN I FIRST INSTALLED TRUCK RAN GREAT FIRST 200 MILES THEN THE LIGHTS STARTED TO LIGHT UP. ANY IDEAS?? -FRUSTRATED
Teching In
Joined: Jul 2004
Posts: 22
Likes: 0
Did you use the correct PN for you application.. I bet that there is a difference in resistance values and that's why the codes . The first code is the MAF code , the second
is fuel system lean. I say change it back clear the codes if the problem stays away you got a bad or wrong maf.
is fuel system lean. I say change it back clear the codes if the problem stays away you got a bad or wrong maf.
Thread Starter
Teching In
Joined: Jan 2005
Posts: 20
Likes: 0
From: Canton, Ga.
The P/n For The Maf Is Correct. I Did Double Check It. It Is Callibrated For A Cold Air Tune. I Don't Know If This Is Somehow Related? I Will Check The Fuse And Let You Know. Is It Possible I Need A Good Tune? Should Have Nelson Tune In A Few Days.
Thread Starter
Teching In
Joined: Jan 2005
Posts: 20
Likes: 0
From: Canton, Ga.
Also I Have Noticed Ever Since I Installed The Maf I Can Wash My Truck And At The End Of The Day If I Was To Wipe It By The Exhaust I Get Black Resin. I Have Never Had This B-4.????? I Don't However Have Smoke Puffing From Exhaust That Is Visible From A Car Behind Me.( Had Wife Watch While She Was Following Me Home From Longhorn's Last Night.) Any Help Please????? I DID CHECK FUSES AND NONE WERE BLOWN. the engine has gone into speed density mode and is running pig rich more than likely. Aftermarket maf ends cause all sorts of problems. Put it back to stock and clear the codes, I bet it goes away. You may just want to reset the pcm and let it relearn, see if that takes care of it.
Trending Topics
Thread Starter
Teching In
Joined: Jan 2005
Posts: 20
Likes: 0
From: Canton, Ga.
I RESET THE PCM AND CLEANED THE THROTTLE BODY.(IT WAS JUST TIME TO CLEAN IT.) VIOLA, SHE IS LIKE NEW. PERFECT! i AM CONCERNED THAT THIS MIGHT HAPPEN AGAIN AFTER 200 MILE RELEARN. ANY WAY IT CAN BE AVOIDED? I DID CLEAN K&N AIR FILTER LAST NIGHT. REOILING IT B-4 I REINSTALLED CLEAN FILTER. DON'T FEEL LIKE I WENT CRAZY WITH THE OIL THOUGH. THINK THIS MIGHT BE A CONTRIBUTING FACTOR? GREAT ADVISE THANKS TO ALL WHO CONTRIBUTED THEIR KNOWLEDGE!!!! I'M ON THE HUNT AGAIN! 
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
TECH Resident
Joined: Jan 2002
Posts: 877
Likes: 55
From: Poway, Ca. where GOD and the sun always shines
My understanding in this, is that a MAF change (like yours) will change your A/F ratio, usually to the lean side, and you will need to correct that through dyno tuning.
I installed ported MAF ends onto my stock MAF, and started to get upper RPM pinging, a week later I had the vehicle dyno tuned ( for a TC change), and my WOT A/F ratio was 15.8 :1 (very lean). The dyno tuner adjusted the A/F ratio to 13.5 :1 WOT, and the vehicle never ran better.
There is an old addage (sp) on these boards pertaining to MAFS : LEAVE THEM ALONE.
SteveC
I installed ported MAF ends onto my stock MAF, and started to get upper RPM pinging, a week later I had the vehicle dyno tuned ( for a TC change), and my WOT A/F ratio was 15.8 :1 (very lean). The dyno tuner adjusted the A/F ratio to 13.5 :1 WOT, and the vehicle never ran better.
There is an old addage (sp) on these boards pertaining to MAFS : LEAVE THEM ALONE.
SteveC
