LTFT's +20
Thread Starter
Joined: Nov 2001
Posts: 3,066
Likes: 0
From: Sunny San Diego
LTFT's +20 I tuned my engine about a week or so ago and everything was running great.
Just went to the dyno this past weekend to try out a 50 shot.
I ran pig rich on the dyno without the N20. AFR was 10:1
After checking EFI, my B1S1 was +20. B2S1 was locked at zero. LTFT's were negative but when I go WOT, they hit zero for a moment then +20.
Any idea what could cause this??
Just went to the dyno this past weekend to try out a 50 shot.
I ran pig rich on the dyno without the N20. AFR was 10:1
After checking EFI, my B1S1 was +20. B2S1 was locked at zero. LTFT's were negative but when I go WOT, they hit zero for a moment then +20.
Any idea what could cause this??
Yes. I meant to add exhaust leak also. Since in closed loop the O2's directly affect LTRIMS if your O2's detect excesive air on that bank it will contiune to make the LTRIMS go positive. Eventually it will set a code.
Thread Starter
Joined: Nov 2001
Posts: 3,066
Likes: 0
From: Sunny San Diego
Normal part throttle driving, all fuel cells are negative. Nothing extreme except for decel which is the SC.
I will be on the freeway cruising about 70 mph. LTFT's are -1 to -3.
As soon as I go WOT, they wil jump to zero, then B1S1 will shoot up to +20.
I'll check the exhaust on the driver side and make sure there is no air getting in. Its just weird that part-throttle is fine.
I will be on the freeway cruising about 70 mph. LTFT's are -1 to -3.
As soon as I go WOT, they wil jump to zero, then B1S1 will shoot up to +20.
I'll check the exhaust on the driver side and make sure there is no air getting in. Its just weird that part-throttle is fine.
Last edited by Ed Blown Vert; Jun 21, 2004 at 12:17 PM.
Thread Starter
Joined: Nov 2001
Posts: 3,066
Likes: 0
From: Sunny San Diego
Yes COT is turned off. Its is wierd, everything was fine a week ago.
And this is happening only on bank one. I am going to switch sides on the o2 sensors and see if it moves to bank 2.
And this is happening only on bank one. I am going to switch sides on the o2 sensors and see if it moves to bank 2.
Trending Topics
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
Better take the blower off Ed ! 
Hehe, just kidding. Look for air leaks (vac/exhaust) on the side reading lean.
Maybe it takes WOT pressure for it to leak ?
Let me know if you need a hand.
Rob (Bad30th)
Hehe, just kidding. Look for air leaks (vac/exhaust) on the side reading lean.
Maybe it takes WOT pressure for it to leak ?
Let me know if you need a hand.
Rob (Bad30th)
