04-25-2013, 08:22 AM | #1 |
Drives: 2000 Camaro SS Join Date: Feb 2010
Location: Louisville, Ky.
Posts: 25,179
|
"Weak" vs "Strong" Camaro SS MAF Sensors
GM uses two supplier for Camaro SS MAF sensors. The simple explanation is that "weak" sensors from one of the suppliers are not showing the same resistance levels as the "strong" sensors from the other. Both work fine when the car remains stock but when additional airflow is introduced the "weak" sensor can start to become a problem.
The MAF sensors that have been identified as "weak" read 1560-1670HZ at idle with the A/C off while a "strong" MAF reads at 1800MHZ. During on road, light throttle input the MHZ are slow and weak in response to throttle changes which causes hesitation, throttle lag, and poor driveability. At wide open throttle the "weak" MAF shows 120-170MHZ lower than the 8600MHZ the "strong" MAF sensors will show on the same car. Depending on what intake modifications are made the fuel trim with a "weak" MAF can range from -25% on the high end to -3% with just a simple aftermarket panel replacement filter. So what kind of performance issues will a "weak" MAF sensor present? Slow throttle response, low RPM bunking and surging, choppy idle, bogging when downshifting or applying quick heavy throttle inputs, and more. The good news is that all you have to do is pull the "weak" sensor and install a "strong" sensor and within seconds fuel trim is back to 0% and MHZ are back to 1800+. This will instantly change the personality of a car as was demonstrated in the threads below. Issue SOLVED strong MAF Strong MAF sensor. Believe the hype How can I tell if my MAF is "weak" or "strong"? It is very simple. Remove the MAF sensor from your intake tube and take a look at the code inside the indented window. Any single letter MAF is "weak" and any MAF that features a letter followed by a number like the one in the picture below is "strong". Setting things straight There are two points of confusion that seem to constantly come up when this topic is discussed: 1) This is a hardware issue with the MAF sensor and not a tune issue. The issue can not be corrected with a tune. 2) The "weak" sensors function just fine and are within OEM tolerances when the car remains in the stock configuration. Once additional air flow is introduced due to modifications is when problems arise. Because of that it is not something that GM will replace under warranty. Last edited by Apex Motorsports; 12-31-2015 at 12:44 PM. |
04-25-2013, 09:53 AM | #2 |
Drives: 2013 2SS/RS 1LE Join Date: May 2011
Location: Marion, Ia
Posts: 237
|
Thanks for the informative post. K8 on mine so it is good. Your write-ups on the commonly asked questions have been a great read and highly appreciated.
__________________
John
13 VR 2SS/RS 1LE (sold) 01 Z28 M6 HT |
04-25-2013, 10:02 AM | #3 |
Drives: '10 Camaro LS3 2SS/RS, 1968 Nova Join Date: Aug 2010
Location: California
Posts: 972
|
I agree!! Chase your write ups are very helpful for all of us. Thanks for all the knowledge you share with us!
__________________
Performance- Kooks Headers w/HF cats, ZL1 Corsa exhaust, VMax, CAI Inc. CAI, MGW shifter, RX CC Suspension - KW V3 Coilovers/ Full PFADT & BMR suspension Appearance - ZL1 Fascia/Sides/ Diffuser, AAC Afterburners, RK Sport 3pc Spoiler, SLP Black out Kit
|
04-25-2013, 05:21 PM | #4 | |
Drives: 2000 Camaro SS Join Date: Feb 2010
Location: Louisville, Ky.
Posts: 25,179
|
Quote:
|
|
04-25-2013, 07:55 PM | #5 |
Drives: 2010 IOM SS/RS Join Date: Feb 2013
Location: Central NJ
Posts: 456
|
Hey Chase, thanks for getting this type of information out there for us. I just looked and found a single letter "L" on mine so I now have to replace mine before my tune.
Do you know if there are multiple GM part numbers for the MAF sensor? Will one denote a "strong" vs a "weak" MAF sensor? From what I've read on this forum only the single letter denotes the type of sensor, "weak", correct? But are there multiple part numbers from GM for the MAF sensor? Thanks |
04-25-2013, 08:12 PM | #6 | |
Drives: 2000 Camaro SS Join Date: Feb 2010
Location: Louisville, Ky.
Posts: 25,179
|
Quote:
|
|
04-27-2013, 10:51 PM | #7 |
Drives: 2010 IOM SS/RS Join Date: Feb 2013
Location: Central NJ
Posts: 456
|
Thanks again for the info Chase.
|
04-28-2013, 12:49 AM | #8 |
|
Mine is weak.....damn it
|
04-28-2013, 01:08 AM | #9 |
HEADTURNER™®©COTW 12/9/13
|
How much for the strong MAF to 91331??
__________________
Check out the build thread http://www.camaro5.com/forums/showthread.php?t=222576
|
04-28-2013, 03:46 AM | #10 |
[COTW 1/6/14]
Drives: 2017 1LE Join Date: Mar 2012
Location: Scott AFB/STL
Posts: 2,004
|
can you send me a PM to 19962
|
04-28-2013, 01:17 PM | #11 |
Drives: 2000 Camaro SS Join Date: Feb 2010
Location: Louisville, Ky.
Posts: 25,179
|
|
04-28-2013, 03:10 PM | #12 |
Drives: 2010 1SS/RS Imperial Blue Metallic Join Date: Sep 2010
Location: Huntington West Va
Posts: 443
|
PM how much to 25704
|
04-28-2013, 03:24 PM | #13 |
Drives: 2000 Camaro SS Join Date: Feb 2010
Location: Louisville, Ky.
Posts: 25,179
|
|
04-28-2013, 03:32 PM | #14 |
Untamed Performance EPT
Drives: 2011 2SS Join Date: Aug 2012
Location: El Paso
Posts: 372
|
I'm currently deployed overseas and was talkin' to my buddy that is starting my car up every week for me and I had him pull my MAF sensor to check for a week one and indeed he pulled out one with a singular letter on it.
He told me this: "it looks like it was printed with an X at the factory but then it look like some one tried putting an S over it with a knife or something" Talked to Chase already and got the hook up... However just curious about the markings my buddy stated, he couldnt get me a picture with his camera phone. Any ideas? lol
__________________
Night Fury Cam
Borla LT Headers and Borla Cat Back ATAK 9in. diff with 4.11's, DSS Axles, and Alum Shaft Hurst Short-Shifter; Ideal Garage Master Cylinder H-E Street Slayer Twin Billet Clutch BMR: Adjustable; Trailing Arms, Toe Rods, Extreme Sway Bar. BMR Subframe Bushings. Strange Rear Coilovers and mounts Tuned by Rhino79 |
|
|
Tags |
apex, bucking, maf, surging, weak |
|
|