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

Wtf?

Thread Tools
 
Search this Thread
 
Old Jul 4, 2009 | 09:53 AM
  #1  
deuce4935's Avatar
Thread Starter
TECH Resident
15 Year Member
iTrader: (2)
 
Joined: Sep 2006
Posts: 760
Likes: 3
Default Wtf?

I'm having problems with my ls1. Motor is from a 98' f-body and its installed in my 80' Caprice. I swapped the cam for a Z06 cam. Upon start up car runs very poorly, unable to idle on its on and after about 15-30mins of run time it smoothes out but if I mash the gas it backfires like a *****! I know it needs to be tuned for the cam swap but I want to make sure there isnt something else wrong. Any ideas are greatly appreciated!
Reply
Old Jul 4, 2009 | 10:07 AM
  #2  
rotor vs. piston's Avatar
TECH Enthusiast
iTrader: (3)
 
Joined: Jan 2004
Posts: 583
Likes: 3
Default

No expert, if it's back firing could it be that the cam is degreed way off. In that the intake valve isn't closing before the piston is coming back up in the compression stroke?
Reply
Old Jul 4, 2009 | 01:17 PM
  #3  
digitalsolo's Avatar
TECH Fanatic
20 Year Member
Photogenic
iTrader: (24)
 
Joined: Mar 2005
Posts: 1,038
Likes: 3
From: Fort Wayne, Indiana
Default

You really need to put a scanner on it and see what's happening. Are all your sensors happy? Is the timing sane? What is it doing when it backfires (fuel trims, timing, TPS) ?
Reply
Old Jul 11, 2009 | 12:59 AM
  #4  
deuce4935's Avatar
Thread Starter
TECH Resident
15 Year Member
iTrader: (2)
 
Joined: Sep 2006
Posts: 760
Likes: 3
Default

I finally had a chance to scan and there are no codes of any kind, not even for the back firing issue. So I'm wondering if it has to do with the computer not being properly calibrated for the new cam? The idle quality is poor and when I go wot it backfires and cuts off like theres too much air or fuel or not enough of.
Reply




All times are GMT -5. The time now is 03:52 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