Conversions & Swaps LSX Engines in Non-LSX Vehicles
Sponsored by:
Sponsored by:

Issues after ls1 swap

Thread Tools
 
Search this Thread
 
Old Aug 10, 2016 | 02:12 PM
  #1  
67 SS's Avatar
Thread Starter
Teching In
 
Joined: Aug 2012
Posts: 18
Likes: 0
Default Issues after ls1 swap

I just completed a and ls1/t56 swap into my 67 nova. This was my first time messing with anything fuel injected and I don't have any tuning software. The first day I got the car fired, I drove it around the neighborhood off and on to check gauges, temp, fans, etc and everything was great and I didn't experience any issues whatsoever. The next weekend I went to back it out of the garage and now, when you give it throttle just out of idle it stumbles really bad and I get an occasional backfire out of the exhaust. Once I baby it over approx. 1200-1500 rpms and then give it throttle it seems to run fine until it drops back to idle and starts over. Does anyone have any idea where I can start to diagnose without having any tuner/scanner software? So far, I've metered the tps and it seems to look smooth as best as I can tell but not sure what to look for next.
Reply
Old Aug 10, 2016 | 04:37 PM
  #2  
ls1nova71's Avatar
TECH Veteran
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (4)
 
Joined: Jan 2008
Posts: 4,406
Likes: 211
From: Liberty, MO
Default

Whats your fuel pressure at?
Reply
Old Aug 10, 2016 | 07:41 PM
  #3  
67 SS's Avatar
Thread Starter
Teching In
 
Joined: Aug 2012
Posts: 18
Likes: 0
Default

Right around 56-58 range
Reply
Old Aug 10, 2016 | 07:43 PM
  #4  
33willys's Avatar
TECH Enthusiast
10 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (1)
 
Joined: Mar 2014
Posts: 699
Likes: 59
From: Alamogordo, NM
Default Issues

Welcome to the dark world of fuel injection! Time to update your tool box with a noid light, code reader, fuel pressure gauge and non-contact thermometer. If you have a smart phone just get an app such as Torque Pro to see what's going on with the electronics. You have got this far so the above should be easy!
Reply
Old Aug 10, 2016 | 09:13 PM
  #5  
67 SS's Avatar
Thread Starter
Teching In
 
Joined: Aug 2012
Posts: 18
Likes: 0
Default

Haha, thanks! I know it will be worth it when it's all done but getting there and being a complete newb hasn't been easy. Is torque pro an android app? I have an iPhone and can't find that. If so, does anybody know of anything that will allow me to log sensor activity, etc? There's no way I'm in the position right now to spring for hp tuners or anything like that. Even if I could I wouldn't know where to start. I'll get there, just gotta work a few bugs out and learn where to look.
Reply
Old Aug 11, 2016 | 12:28 PM
  #6  
dan96z71's Avatar
TECH Enthusiast
 
Joined: Dec 2006
Posts: 514
Likes: 0
From: Grafton MA
Default

How do the plugs look?
Reply
Old Aug 11, 2016 | 02:26 PM
  #7  
67 SS's Avatar
Thread Starter
Teching In
 
Joined: Aug 2012
Posts: 18
Likes: 0
Default




All are dry and look like the have a little black carbon on them.
Reply
Old Aug 11, 2016 | 11:27 PM
  #8  
33willys's Avatar
TECH Enthusiast
10 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (1)
 
Joined: Mar 2014
Posts: 699
Likes: 59
From: Alamogordo, NM
Default ls1 swap

I had no problem finding the TORQUE app. For the pro version the price is $4.95 and you will need a blue tooth for the ALDL to link the two together. Other way to go is a Harbor Freight code reader. I like the Android version much better as it will give real time data and a wheelbarrow full of features.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

 Brett Foote
story-1

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-2

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-3

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-4

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

 Verdad Gallardo
story-5

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

 Pouria Savadkouei
story-6

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

 Verdad Gallardo
story-7

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-8

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-9

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
Old Aug 12, 2016 | 04:20 AM
  #9  
casias's Avatar
TECH Regular
10 Year Member
iTrader: (1)
 
Joined: Aug 2012
Posts: 495
Likes: 4
Default

You need a tune.
Reply




All times are GMT -5. The time now is 04:47 PM.

story-0
6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

Don't get dad new socks or a grill brush this year.

By Brett Foote | 2026-06-09 14:55:56


VIEW MORE
story-1
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-2
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-3
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-4
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-5
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-6
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-7
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-8
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-9
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