PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Long Term Fuel Trims Split

Thread Tools
 
Search this Thread
 
Old Mar 8, 2009 | 03:40 PM
  #1  
C_Rules's Avatar
Thread Starter
12 Second Club
iTrader: (7)
 
Joined: Oct 2005
Posts: 1,666
Likes: 0
From: NYC
Default Long Term Fuel Trims Split

So I've been trying to tune this for a while on my LT1. My long term fuel trims are split and my short term fuel trims are fine at +/-5% of 128. My LTFTs are lean on the drivers side 130-145 range while the passenger side is rich at 115-120 range.

The splits were worse but I sent my injectors to get cleaned and now I'm at the above ranges. I've tried playing with all kinds of different things but I haven't really been able to get this problem fixed. I'm going to seafoam the car to see if I have any leaks which I'm not hearing or seeing. Anybody have any ideas of what else I can do to try to get this corrected?

Last edited by C_Rules; Mar 8, 2009 at 04:19 PM.
Reply
Old Mar 8, 2009 | 05:01 PM
  #2  
C_Rules's Avatar
Thread Starter
12 Second Club
iTrader: (7)
 
Joined: Oct 2005
Posts: 1,666
Likes: 0
From: NYC
Default

I attached a graph of the trims so anyone who wants to check out what they look like can see.
Attached Files
File Type: zip
Fuel Trims Graph.zip (9.7 KB, 25 views)
Reply
Old Mar 8, 2009 | 06:45 PM
  #3  
Eagle02's Avatar
TECH Regular
iTrader: (20)
 
Joined: Mar 2007
Posts: 452
Likes: 0
From: NW Burbs of Chicago
Default

How old are the O2s? Do you have access to a wideband to verify the narrowband O2s are reading properly?
Reply
Old Mar 8, 2009 | 06:51 PM
  #4  
C_Rules's Avatar
Thread Starter
12 Second Club
iTrader: (7)
 
Joined: Oct 2005
Posts: 1,666
Likes: 0
From: NYC
Default

O2s are only a few months old. that was one of the first things i changed when trying to fix this. I do have a wideband mounted in my y pipe.
Reply
Old Mar 9, 2009 | 03:32 PM
  #5  
C_Rules's Avatar
Thread Starter
12 Second Club
iTrader: (7)
 
Joined: Oct 2005
Posts: 1,666
Likes: 0
From: NYC
Default

Anybody else got any ideas?
Reply
Old Mar 15, 2009 | 12:46 AM
  #6  
Johnv's Avatar
TECH Enthusiast
20 Year Member
 
Joined: Jan 2004
Posts: 608
Likes: 0
From: New Zealand
Default

exhaust leak before o2 sensors, inlet manifold leak on one bank, misfire on one bank (plug or leads),uneven flow rates on injectors.
Reply




All times are GMT -5. The time now is 08:57 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