Holley terminator x max running lean
Thread Starter
Teching In
Joined: May 2020
Posts: 11
Likes: 1
Holley terminator x max running lean New to fuel injection tuning so I'd like some input on this. Fired the engine for the first time the other day and it was running really poorly, so after some fuel pressure, IAC, and idle screw adjustments it seems to idle and run much better, but I've noticed that my AF ratio is bouncing between 17-20ish, while my idle target is 13.8. Also it seems like the throttle hangs at high rpm after i let off the gas. Any ideas? Car isn't all the way put together yet so that maybe has something to do with it but I wouldn't think it should do that. Thank you in advance
Last edited by 78_nova; Feb 27, 2024 at 10:26 AM.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
More info about your engine and setup would be useful. Is this an LS engine swap, an upgraded SB or what? So here are a couple questions:
Q1 - Is your O2 sensor more than 24" from the open part of your exhaust? I.e. open headers will not give an accurate reading.
Q2 - Did you enter your Injector size correctly into the tune?
Q3 - Does you fuel pressure match what you entered into the tune?
Also no idea what "the throttle hands at high rpm" means, but lets get the idle AFR working first.
Q1 - Is your O2 sensor more than 24" from the open part of your exhaust? I.e. open headers will not give an accurate reading.
Q2 - Did you enter your Injector size correctly into the tune?
Q3 - Does you fuel pressure match what you entered into the tune?
Also no idea what "the throttle hands at high rpm" means, but lets get the idle AFR working first.
Thread Starter
Teching In
Joined: May 2020
Posts: 11
Likes: 1
More info about your engine and setup would be useful. Is this an LS engine swap, an upgraded SB or what? So here are a couple questions:
Q1 - Is your O2 sensor more than 24" from the open part of your exhaust? I.e. open headers will not give an accurate reading.
Q2 - Did you enter your Injector size correctly into the tune?
Q3 - Does you fuel pressure match what you entered into the tune?
Also no idea what "the throttle hands at high rpm" means, but lets get the idle AFR working first.
Q1 - Is your O2 sensor more than 24" from the open part of your exhaust? I.e. open headers will not give an accurate reading.
Q2 - Did you enter your Injector size correctly into the tune?
Q3 - Does you fuel pressure match what you entered into the tune?
Also no idea what "the throttle hands at high rpm" means, but lets get the idle AFR working first.
Last edited by 78_nova; Feb 27, 2024 at 01:36 PM.
TECH Apprentice
Joined: Apr 2019
Posts: 301
Likes: 129
it's a .030 over 6.0 block with ported ls3 heads, trick flow sloppy stage 2 clone, holley 92mm throttle body with accel 48lb injectors. The car has most of an exhaust system on it, definitely more than 24 inches. I'm sure I have the right injectors I put it in via part number, and I corrected the fuel pressure in the tune because I initially had it too high, bust as of right now the injectors are rated for 43.5lb and we've got 44ish pounds of pressure. Ps: I meant hangs, not hands. Thanks for your time
Since you said you're playing with the screw and IAC adjustments it sounds like DBC throttle body. What is your idle IAC % currently at?
Thread Starter
Teching In
Joined: May 2020
Posts: 11
Likes: 1
I haven't looked at the fuel table yet, as I said I'm new to fuel injection tuning, but I'll see about looking thru the touch display, I dont currently have a working laptop to plug into. IAC is low right now, 0-1 or 2 percent so I know I need to make some adjustments there, I just wouldn't think it would cause it to lean out that much. But I'll fiddle with it a little after work and see
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
You say the injectors are rated at 43.5 lbs, but is that at 43.5 PSI? Some of the Terminator X specific injectors are rated at 60 PSI. (I just got caught myself on that detail.)
If there were indeed rated at 60 psi, it would exactly explain you super-lean condition.
If there were indeed rated at 60 psi, it would exactly explain you super-lean condition.
Trending Topics
Thread Starter
Teching In
Joined: May 2020
Posts: 11
Likes: 1
yeah I double checked because originally I had it running at 60psi and it didn't like it, dropped it down to 43ish and it ran much better but still lean
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
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
I'm guessing you are using the handheld. Does it say CL or closed loop when it's running? It should also show how much fuel it's adding or removing.
It won't start learning till 160 degrees unless it's been changed, but it will go into closed loop and compensate to achieve the desired AFR.
Without seeing a tune and a log, we are just guessing.
It won't start learning till 160 degrees unless it's been changed, but it will go into closed loop and compensate to achieve the desired AFR.
Without seeing a tune and a log, we are just guessing.
did you change all the injector data to reflect either 60 or 44 lbs? If I remember the Holley right there is also a rated and running pressure setting too.
TECH Fanatic
Joined: Jan 2009
Posts: 1,065
Likes: 476
From: Bostwick, GA.
?? 
Thread Starter
Teching In
Joined: May 2020
Posts: 11
Likes: 1