PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Pulled my MAF tonight

Thread Tools
 
Search this Thread
 
Old Jul 7, 2004 | 09:33 PM
  #1  
HumpinSS's Avatar
Thread Starter
FormerVendor
iTrader: (1)
 
Joined: Feb 2002
Posts: 3,059
Likes: 0
From: Waldorf, MD
Default Pulled my MAF tonight

After two long grueling days of fooling around witht he ve table and it not making a difference tonight I pulled the MAf to see what would happen.

Got in the car flashed a file and pulled theMAF and started logging. To my surprise the car drove better and get this the Trims were updating (have log fiels to prove it). For some reason the ve table doesnt seem to affect feuling when changes are beign madeto it. Once the maf was unpluged i saw all the hard work i have been doing go into effect. No ses light was set as yet so we will see and the car doesnt appear to have gone into the low octane tables. I think part of the reason the trims are updating are because of th o2 sensors still being in the loop. Tomorrow i will verify with more information (EFILive) what the car is doing.

Here is my HPtuners log file fromthe short drive if someone will host it for me since we cant upload csv files
Reply
Old Jul 7, 2004 | 09:49 PM
  #2  
Another_User's Avatar
TECH Addict
 
Joined: Feb 2004
Posts: 2,826
Likes: 0
Default

I never did figure out if there was a difference between normal LTFT learn and "aggressive" LTFT learn that occurs when the PCM loses power. Mine updated pretty fast for some reason (compared to logs from almost the exact same IAT and coolant temp). I think your temps make a big difference too. I have seen the trims fluctuate a lot when the engine is really hot (like sitting in traffic).
Reply
Old Jul 7, 2004 | 10:09 PM
  #3  
HumpinSS's Avatar
Thread Starter
FormerVendor
iTrader: (1)
 
Joined: Feb 2002
Posts: 3,059
Likes: 0
From: Waldorf, MD
Default

We will see how the car runs.

Last edited by HumpinSS; Jul 7, 2004 at 10:24 PM.
Reply
Old Jul 8, 2004 | 08:00 PM
  #4  
XLR8NSS's Avatar
Adkoonerstrator
iTrader: (4)
 
Joined: Nov 2001
Posts: 21,420
Likes: 0
From: Deep in the seedy underworld of Koonerville
Default

After about 50 or so miles the car will throw a Low voltage input code for the MAF circuit and will try to rip the transmission out when it shifts.....It will shift HARD.

That is my experience anyway. I think S_J_H had a similiar experience after taking the MAF outta the equation.
Reply
Old Jul 8, 2004 | 08:16 PM
  #5  
HumpinSS's Avatar
Thread Starter
FormerVendor
iTrader: (1)
 
Joined: Feb 2002
Posts: 3,059
Likes: 0
From: Waldorf, MD
Default

M6 here. after the car threw the code on the next start it didnt want to stay running for some reason. I had to keep featherin the gas to keep it a float so i plugged the **** back up and called it a day.
Reply
Old Jul 8, 2004 | 08:28 PM
  #6  
XLR8NSS's Avatar
Adkoonerstrator
iTrader: (4)
 
Joined: Nov 2001
Posts: 21,420
Likes: 0
From: Deep in the seedy underworld of Koonerville
Default

I also had the "didn't want to stay running" problem. Mine was unhooked by accident though 'cause I forgot to plug it back in after working on my intake system.

Truck drove fine for 50 miles and then it went to hell.
Reply
Old Jul 8, 2004 | 08:55 PM
  #7  
Bink's Avatar
TECH Addict
20 Year Member
 
Joined: Jul 2002
Posts: 2,261
Likes: 0
Default

sounds like reduced power/limp mode.
Reply
Old Jul 8, 2004 | 10:13 PM
  #8  
Another_User's Avatar
TECH Addict
 
Joined: Feb 2004
Posts: 2,826
Likes: 0
Default

Yeah. I think it does that any time it throws a MAF code doesn't it?
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Jul 9, 2004 | 12:17 AM
  #9  
P Mack's Avatar
TECH Addict
iTrader: (6)
 
Joined: Jan 2003
Posts: 2,382
Likes: 2
From: Phoenix
Default

That's good info thanks for checking that out. I remember gameover mentioning some things about changing thresholds for limp home mode so you can tune mafless in another thread. Maybe he'll chime in here.
Reply
Old Jul 9, 2004 | 02:34 AM
  #10  
gameover's Avatar
FormerVendor
 
Joined: Jan 2003
Posts: 525
Likes: 0
From: Melbourne, Australia
Default

why would i spoil all this fun?

HumpinSS CYM.
Reply




All times are GMT -5. The time now is 08:29 AM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE