 |
|
Jun-10-12, 07:42 PM
|
#1
|
Stand Alone
Real Name: Coy
Member # 12264
Join Date: May 2011
Status: Offline
Location: Cabot, AR
Posts: 821
|
LS7 MAF Problems
I have a 4" fwi with the LS7 MAF card. I have 1 tuner that can't get the idle and part throttle drivability right. I have flat spots in my full throttle. And another tuner (very reputable) said he WON'T tune anymore tbss's with the ls7 maf. He has done 2 and won't do anymore. Any help?
__________________
06 Black Trailblazer 3SS 2wd, some intake stuff, one of them tune things, an exhaust leak, a fancy transmission, an eeeelectric fan, sits real low like, and beer in the back (for traction  ) .... (to be continued...)
|
|
|
|
|
Jun-10-12, 07:50 PM
|
#2
|
Dustin is my BITCH
Real Name: Jay
Member # 9298
Join Date: Sep 2010
Status: Offline
Location: middletown ohio
Posts: 7,710
|
There is nothing wrong with an ls7 maf in these, so I would find a tuner who knows what the hell there're doing.
__________________
|
|
|
|
|
Jun-10-12, 07:55 PM
|
#3
|
DIY - King a destruction
Real Name: Walter
Member # 12143
Join Date: May 2011
Status: Offline
Location: West Bend WI
Posts: 3,876
|
Post your tune and a log of driving it through at least 4000rpm, and with some idle areas. There are several of us that can give you a hand. Its not hard, I have a thread that will give you some startup values if you wanna start over. Just copy and paste the values in there to start with, and get us a log with fuel trims on the VE, and on the MAF. It wont take long at all to dial it in.
http://www.tbssowners.com/forums/sho...10#post1193810
__________________
6.0 AWD ~ T88 Turbo ~ 60mm Gate ~ 50mm BOV
Diamond Pistons ~ Eagle Crank & Rods ~ Superchilled
Billet 4L80 ~ 4000 Stall Billet Converter
|
|
|
|
|
Jun-10-12, 08:10 PM
|
#4
|
Stand Alone
Real Name: Coy
Member # 12264
Join Date: May 2011
Status: Offline
Location: Cabot, AR
Posts: 821
|
I don't have a cable to log with.
__________________
06 Black Trailblazer 3SS 2wd, some intake stuff, one of them tune things, an exhaust leak, a fancy transmission, an eeeelectric fan, sits real low like, and beer in the back (for traction ) .... (to be continued...)
|
|
|
|
|
Jun-10-12, 08:12 PM
|
#5
|
illegitiminoncarborundum
Real Name: Matt
Member # 64
Join Date: Jun 2007
Status: Offline
Location: Norcal
Posts: 24,671
|
As long as the sensor is facing the right way it isn't very hard to tune.
__________________
08' C6 M6 743/647
93' Z28 A3- in pieces
06' RCSB H/C
|
|
|
|
|
Jun-10-12, 08:19 PM
|
#6
|
Stand Alone
Real Name: Coy
Member # 12264
Join Date: May 2011
Status: Offline
Location: Cabot, AR
Posts: 821
|
They both said my fuel trims are inconsistent. That the intake is creating turbulence and uneven flow across the sensor.
__________________
06 Black Trailblazer 3SS 2wd, some intake stuff, one of them tune things, an exhaust leak, a fancy transmission, an eeeelectric fan, sits real low like, and beer in the back (for traction ) .... (to be continued...)
|
|
|
|
|
Jun-10-12, 08:55 PM
|
#7
|
DIY - King a destruction
Real Name: Walter
Member # 12143
Join Date: May 2011
Status: Offline
Location: West Bend WI
Posts: 3,876
|
I call B.S. - Unless there is an obstruction within a couple inches of the MAF sensor, they are full of crap. The only other thing is if its too close to the TB. Even then, they are still tunable. You need to either get HPT for yourself, and let us help you through it, or take it to another tuner that actually knows what he is doing. Maybe someone on the forum here will know someone that lives near you that has HPT that can do a log, or fix it for ya. Dont get too stressed out, its an easy fix. Tell your current tuner to 
__________________
6.0 AWD ~ T88 Turbo ~ 60mm Gate ~ 50mm BOV
Diamond Pistons ~ Eagle Crank & Rods ~ Superchilled
Billet 4L80 ~ 4000 Stall Billet Converter
|
|
|
|
|
Jun-10-12, 09:09 PM
|
#8
|
Stand Alone
Real Name: Coy
Member # 12264
Join Date: May 2011
Status: Offline
Location: Cabot, AR
Posts: 821
|
Lol he has been playing with it all day with a couple of guys from Cali that are here see a Gm approved and warrantied performance division.
__________________
06 Black Trailblazer 3SS 2wd, some intake stuff, one of them tune things, an exhaust leak, a fancy transmission, an eeeelectric fan, sits real low like, and beer in the back (for traction ) .... (to be continued...)
|
|
|
|
|
Jun-10-12, 10:30 PM
|
#9
|
DIY - King a destruction
Real Name: Walter
Member # 12143
Join Date: May 2011
Status: Offline
Location: West Bend WI
Posts: 3,876
|
If your seeing a hesitation, look at the MAF table in 2D mode, and blow it up to full screen. Look for any ups and downs, there shouldnt be any. It should be a curved line going upward. Also make sure the value in the highest column of the low table matches the lowest column in the high table. Some tuners get to making changes, and forget to match the same frequency and it freaks the computer out as its getting mixed signals when switching from the low to the high table. But seriously, look at your stock MAF table in 2D mode full screen, then look at what you have now. they should plot the same upward trend without up and down deviations. It needs to be smooth, or he didnt hit some cells enough. A good tuner should be able to see the trends after a few runs, and hand smooth it. Then do one more run to double check and make final adjustments, & it should be good.
__________________
6.0 AWD ~ T88 Turbo ~ 60mm Gate ~ 50mm BOV
Diamond Pistons ~ Eagle Crank & Rods ~ Superchilled
Billet 4L80 ~ 4000 Stall Billet Converter
|
|
|
|
|
Jun-11-12, 05:46 AM
|
#10
|
illegitiminoncarborundum
Real Name: Matt
Member # 64
Join Date: Jun 2007
Status: Offline
Location: Norcal
Posts: 24,671
|
Pics of how the maf is housed?
__________________
08' C6 M6 743/647
93' Z28 A3- in pieces
06' RCSB H/C
|
|
|
|
|
Jun-11-12, 05:59 AM
|
#11
|
Stand Alone
Real Name: Coy
Member # 12264
Join Date: May 2011
Status: Offline
Location: Cabot, AR
Posts: 821
|
After work. I will
__________________
06 Black Trailblazer 3SS 2wd, some intake stuff, one of them tune things, an exhaust leak, a fancy transmission, an eeeelectric fan, sits real low like, and beer in the back (for traction ) .... (to be continued...)
|
|
|
|
|
Jun-11-12, 07:02 AM
|
#12
|
SMFH
Real Name: Tim
Member # 2694
Join Date: Jun 2008
Status: Offline
Location: 41.98 N,88.20 W
Posts: 9,358
|
Is the MAF facing the right way?
|
|
|
|
|
Jun-11-12, 07:14 AM
|
#13
|
Stand Alone
Real Name: Coy
Member # 12264
Join Date: May 2011
Status: Offline
Location: Cabot, AR
Posts: 821
|
Yes
__________________
06 Black Trailblazer 3SS 2wd, some intake stuff, one of them tune things, an exhaust leak, a fancy transmission, an eeeelectric fan, sits real low like, and beer in the back (for traction ) .... (to be continued...)
|
|
|
|
|
Jun-11-12, 07:16 AM
|
#14
|
Real Name: Jon
Member # 5717
Join Date: Jun 2009
Status: Offline
Location: IL
Posts: 1,265
Rep Power: 
|
Did you correctly re-pin it?
__________________
2007 Trailblazer SS AWD - PCMforless Tune | LS1 e-fans | 4" intake w/ LS7 MAF | 160 thermostat | Powerbond UD Pulley | NGK TR6 plugs | Catless y (stock) | Magnaflow 11229 | trans cooler
|
|
|
|
|
Jun-11-12, 07:17 AM
|
#15
|
illegitiminoncarborundum
Real Name: Matt
Member # 64
Join Date: Jun 2007
Status: Offline
Location: Norcal
Posts: 24,671
|
Have you tried another LS7 MAF to see if the current one may be the issue?
__________________
08' C6 M6 743/647
93' Z28 A3- in pieces
06' RCSB H/C
|
|
|
|
|
Jun-11-12, 07:28 AM
|
#16
|
Real Name: JD
Member # 855
Join Date: Sep 2007
Status: Offline
Location: Boulder, CO
Posts: 4,773
|
Quote:
Originally Posted by lt1z
As long as the sensor is facing the right way it isn't very hard to tune.
|
facing the right way as in, direction (air flow) or orientation? Is there a specific orientation that it is supposed to be installed at?
|
|
|
|
|
Jun-11-12, 07:32 AM
|
#17
|
illegitiminoncarborundum
Real Name: Matt
Member # 64
Join Date: Jun 2007
Status: Offline
Location: Norcal
Posts: 24,671
|
Quote:
Originally Posted by JD_SS
facing the right way as in, direction (air flow) or orientation? Is there a specific orientation that it is supposed to be installed at?
|
Yes. It is a directional sensor. Make sure the arrow on the MAF is facing the throttle body.
__________________
08' C6 M6 743/647
93' Z28 A3- in pieces
06' RCSB H/C
|
|
|
|
|
Jun-11-12, 07:33 AM
|
#18
|
Real Name: JD
Member # 855
Join Date: Sep 2007
Status: Offline
Location: Boulder, CO
Posts: 4,773
|
good to know, thanks!!
|
|
|
|
|
Jun-11-12, 07:33 AM
|
#19
|
Stand Alone
Real Name: Coy
Member # 12264
Join Date: May 2011
Status: Offline
Location: Cabot, AR
Posts: 821
|
Yeah I double and triple checked the pins. And yes traded with a vette and worked fine.
__________________
06 Black Trailblazer 3SS 2wd, some intake stuff, one of them tune things, an exhaust leak, a fancy transmission, an eeeelectric fan, sits real low like, and beer in the back (for traction ) .... (to be continued...)
|
|
|
|
|
Jun-11-12, 08:05 AM
|
#20
|
2007,AWD,3SS
Real Name: Eric
Member # 8723
Join Date: Jun 2010
Status: Offline
Location: Summerville,SC
Posts: 973
Rep Power:
|
I had some issues with mine as well. Running lean and I re- angled the intake tune to be as level as possible. Cleared the code and will see if it comes back. The tuner I have said that the tune may need to be tweaked if the code comes back but said the angle is very important to what the MAF is reading
Sent using Tapatalk
__________________
PCM for Less:Tune,"Rob style Cam",.650 springs,160 stat,4'' FWI,plug wires& boots,3wire kit.LS7 MAF,Dorman E-fans,Pacesetter headers and no cat y-pipe,TR6 plugs.HIDextra 6k
|
|
|
|
|
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
 Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
