Florida Members Fun, sun and LS1's

LS1 Conversion Troubleshooting Help needed -- Tampa

Old Sep 26, 2009 | 07:13 PM
  #1  
shanghai_todd's Avatar
Thread Starter
Launching!
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (2)
 
Joined: Nov 2008
Posts: 217
Likes: 1
Default LS1 Conversion Troubleshooting Help needed -- Tampa

Looking for a local GM/LS1 guru that can help me with my Porsche conversion. Install is done and I need help trouble shooting the problem.

Any mobile mechanics in the Tampa Bay are interested?

See link below for more detail


https://ls1tech.com/forums/conversio...need-help.html
Reply
Old Sep 28, 2009 | 06:12 PM
  #2  
shanghai_todd's Avatar
Thread Starter
Launching!
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (2)
 
Joined: Nov 2008
Posts: 217
Likes: 1
Default

Here is a reading from my scanner:

ST FTRM1 (%) 14
LT FTRM1 (%) 24
ST FTRM2 (%) 6.2
LT FTRM2 (%) 24.2
MAP (in.hg) 18.9
Engine (RPM) 800
VEH Speed 0
ING ADV (Deg) 21~24 "keeps moving"
IAT (F) 120
MAF (lb/min) 2.2
ABSLT TPS (%) 0
Second Air "Error"
O2S11 .7v 10.9%
O2S12 .4v N/A
O2S21 .8v 8.5%
O2S22 .4v N/A
Reply
Old Sep 29, 2009 | 02:20 PM
  #3  
shanghai_todd's Avatar
Thread Starter
Launching!
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (2)
 
Joined: Nov 2008
Posts: 217
Likes: 1
Default

Day # 3 of troubleshooting and I have traced an issue with the spark. I used a timing light on each of the spark plug wires to see if I was getting a spark to each of the plugs and found that cylinder #4 and cylinder #7 are dead.

I swapped coil packs with know good ones and the problem still stays at #4 and #7

Not sure what to check next but think it may be in the PCM.

Any advice?
Reply
Old Sep 29, 2009 | 03:31 PM
  #4  
98TA6.0's Avatar
TECH Enthusiast
iTrader: (42)
 
Joined: Apr 2009
Posts: 619
Likes: 1
From: Austin, Texas
Default

do a search. that is a very common problem with these motors.
Reply
Old Sep 29, 2009 | 05:34 PM
  #5  
shanghai_todd's Avatar
Thread Starter
Launching!
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (2)
 
Joined: Nov 2008
Posts: 217
Likes: 1
Default

Throw me a hint or something.. I changed the spark plus with NGK and tried various gaps but still nothing at #4 and #7. Also have new MSD wires and have ruled them out.

common problem rhymes with?

Originally Posted by 98TA6.0
do a search. that is a very common problem with these motors.
Reply
Old Sep 29, 2009 | 09:05 PM
  #6  
bLuE_DeViLz28's Avatar
On The Tree
 
Joined: Mar 2008
Posts: 107
Likes: 0
From: Ruskin,FL
Default

4 and 7 are on the same circuit.https://ls1tech.com/forums/pcm-diagn...ire-2-7-a.html idk i this helps
Reply
Old Oct 4, 2009 | 08:54 AM
  #7  
shanghai_todd's Avatar
Thread Starter
Launching!
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (2)
 
Joined: Nov 2008
Posts: 217
Likes: 1
Default

About to give up, I have tried multiple grounds, new plugs, checked injector and coil signals and everything checks out.
Reply
Old Oct 4, 2009 | 09:43 AM
  #8  
maverickmk's Avatar
On The Tree
15 Year Member
iTrader: (10)
 
Joined: Aug 2007
Posts: 132
Likes: 0
From: Altamonte Springs FL
Default

Have you tried to contact some shops that program these LSx's? Mike Norris & EFI Alchemy are good ones to have a chat with, I would think. Maybe not since they haven't chimed in, but I think it would be worth a phone call. They are regulars on this section and also sponsors. I wish I could help, but I'm more old school & LT1 based. I really like the project you have there. I would like to check it out sometime when you get it all worked out. Sorry I'm not more help, but best of luck with it.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

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

 Verdad Gallardo
story-1

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-2

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-3

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-4

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-5

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-6

10 Camaros You Should Never Buy

 
story-7

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
story-8

Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0

 Brett Foote
story-9

10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever

 Verdad Gallardo
Old Apr 24, 2010 | 04:49 PM
  #9  
shanghai_todd's Avatar
Thread Starter
Launching!
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (2)
 
Joined: Nov 2008
Posts: 217
Likes: 1
Default

Update: Problem Found

As I suspected I inspected the reluctor wheel today and discovered that it is bend and has several teeth that are chew'd up and mis-aligned

Any way these can be fixed without dropping the motor?
Attached Thumbnails LS1 Conversion Troubleshooting Help needed --  Tampa-reluctor-wheel-bend.jpg   LS1 Conversion Troubleshooting Help needed --  Tampa-reluctor-wheel-tooth.jpg  
Reply
Old Apr 24, 2010 | 05:52 PM
  #10  
Steve01SS's Avatar
TECH Enthusiast
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (43)
 
Joined: Jan 2004
Posts: 728
Likes: 5
From: Orlando FL
Default

Crank has to be out of the block to change the reluctor wheel. There also a special tool needed to swap it and get it lined up right.
Reply


Thread Tools
Search this Thread

All times are GMT -5. The time now is 08:08 AM.

story-0
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-1
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-2
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-3
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-4
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-5
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-6
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-7
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
story-8
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0

The world was a better place when it was still around.

By Brett Foote | 2026-01-23 09:20:37


VIEW MORE
story-9
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever

Slideshow: The 7.0-liter LS7 was designed for absolute cutting-edge performance.

By Verdad Gallardo | 2026-01-07 18:36:00


VIEW MORE