Forced Induction Superchargers | Turbochargers | Intercoolers

magnacharged 402ci throwing random misfire code?

Thread Tools
 
Search this Thread
 
Old Oct 8, 2008 | 12:24 PM
  #1  
sixpack_2_go's Avatar
Thread Starter
TECH Resident
iTrader: (1)
 
Joined: Jan 2007
Posts: 778
Likes: 0
From: bentonville, arkansas
Default magnacharged 402ci throwing random misfire code?

we currently have a 05 gto in our shop that we installed 402ci slp short block and a magnacharger. we recomended a low compression 402, but he ordered the high compression model to try to get more hp. we put the stock 243 ls2 heads and cam back on. also new ac delco plugs(magnacharger recomended) and msd wires. all gaskets are good, no leaks. plugs are good and coils are good. the car keeps throwing a random misfire code. we have went over this car many times and cant find anything wrong. the mis isnt even bad enough to feel inside the car. i talked to slp and they said that it could be a tuning issue. we want to have it dyno tuned but we want to make sure its running good before we do. can tuning fix something like a random misfire?
Reply
Old Oct 8, 2008 | 01:43 PM
  #2  
hellbents10's Avatar
LS1Tech Sponsor
iTrader: (10)
 
Joined: Mar 2004
Posts: 4,439
Likes: 4
From: Spring Lake, MI
Default

If its happening at WOT then it is more then likely the plugs as they are too hot and gapped to far more then likely. Run a Tr6 at .032 and have it tuned before going WOT.
Reply
Old Oct 8, 2008 | 01:48 PM
  #3  
pozesd99''s Avatar
TECH Fanatic
iTrader: (3)
 
Joined: Dec 2007
Posts: 1,541
Likes: 0
Default

could it be injectors??? what kind of injectors you running...
Reply
Old Oct 8, 2008 | 04:16 PM
  #4  
98catfish's Avatar
TECH Regular
iTrader: (13)
 
Joined: Nov 2006
Posts: 416
Likes: 0
Default

Is this happening under wot or just cruising?
Set the misfire revolution mode to 32767 in all tables.

If its under wot its probably plugs. I agree get tr6s, Maggie is not an expert on all cars these cars like the ngks.
Reply
Old Oct 8, 2008 | 04:59 PM
  #5  
CTSV_510's Avatar
TECH Fanatic
iTrader: (1)
 
Joined: Jan 2008
Posts: 1,249
Likes: 0
From: West Chester, PA
Default

Originally Posted by sixpack_2_go
also new ac delco plugs(magnacharger recomended)
F magnuson, they don't know what the hell they're talking about. If you're running a tune from them I suggest re-tuning it as well as changing to TR6s at .032

The tune they gave me was BS and the car was breaking up bad with the stock plugs at stock gap (what they recommend).
Reply
Old Oct 8, 2008 | 09:45 PM
  #6  
sixpack_2_go's Avatar
Thread Starter
TECH Resident
iTrader: (1)
 
Joined: Jan 2007
Posts: 778
Likes: 0
From: bentonville, arkansas
Default

i put tr6's in and set an appiontment for a dyno tune with ed wright. it is leaning at idle out due to previous tune.
Reply




All times are GMT -5. The time now is 12:50 PM.

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