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

Gremlins

Thread Tools
 
Search this Thread
 
Old Mar 29, 2003 | 04:46 PM
  #1  
Lesrace82's Avatar
Thread Starter
TECH Regular
iTrader: (8)
 
Joined: Sep 2002
Posts: 482
Likes: 0
From: Byron, IL
Default Gremlins

Ok, where to start.
I finished up most of my wiring on my swap, I got a body control module from another member here on the board, and wired that up.

When power is hooked up fuel pump will come on, but when the engine is starting and running the fuel pump wont run. The motor will die almost imeadiately. If I bypass the relay it runs fine for a few seconds until the anti-theft kills it. Should I just run the relay off the key and say screw the computer?

Then it leads me to my next problem. I have the BCM hooked up, it came with the ignition cylinder, and a GM key with the chip in it. I dont think it is the right key for the cylinder, because it wont turn in the cylinder (unless I'm an idiot and cant figure it out) =). Anyway car starts and will still die after a couple seconds. I checked the lead going out to the computer and it is showing 5 volts. I dont know how the check to see if it is putting out the 50 hertz thats needed. Any ideas on this one?

Sorry about the length of the post. Any assistance is greatly appreciated.
-Bill
Reply
Old Mar 29, 2003 | 09:09 PM
  #2  
jeromio's Avatar
Launching!
 
Joined: Dec 2001
Posts: 259
Likes: 1
From: Durham, NC
Default Re: Gremlins

That should be the correct key - I bought that BCM setup the guy that sold me the motor. He had it wired up and started the motor for me before I loaded it up. Ran for at least 30 seconds that way. I think that whole cylinder turns within the lock mechanism.

You might try checking the grounds to the PCM. Also, there's 2 dark green wires from PCM that look identical - one is fuel and one is the Data line. I had those crossed on mine initially.

I don't think the pump is meant to run continuously.

I presume you have the blue wire on the BCM running to the PCM (I think the PCM wire is yellow/black?), 12v+ going to the pink wire and the black wire(s) grounded?
Reply
Old Mar 31, 2003 | 12:05 AM
  #3  
John B's Avatar
Moderator
20 Year Member
Photogenic
Photoriffic
Liked
iTrader: (10)
 
Joined: Nov 2001
Posts: 3,264
Likes: 21
From: Phoenix, AZ
Default Re: Gremlins

I'm curious why you're even using the BCM in a retrofit?
Reply
Old Mar 31, 2003 | 10:18 PM
  #4  
Lesrace82's Avatar
Thread Starter
TECH Regular
iTrader: (8)
 
Joined: Sep 2002
Posts: 482
Likes: 0
From: Byron, IL
Default Re: Gremlins

Im just trying to get it running as cheap as possible right now. I dont know the first think about making my own Vats module, so thats not really an option for me.
Reply
Old Apr 2, 2003 | 01:28 PM
  #5  
John B's Avatar
Moderator
20 Year Member
Photogenic
Photoriffic
Liked
iTrader: (10)
 
Joined: Nov 2001
Posts: 3,264
Likes: 21
From: Phoenix, AZ
Default Re: Gremlins

What vehicle are you working with?
Reply
Old Apr 2, 2003 | 04:45 PM
  #6  
Lesrace82's Avatar
Thread Starter
TECH Regular
iTrader: (8)
 
Joined: Sep 2002
Posts: 482
Likes: 0
From: Byron, IL
Default Re: Gremlins

72 Camaro 98 LS1
Reply
Old Apr 6, 2003 | 12:23 AM
  #7  
jeromio's Avatar
Launching!
 
Joined: Dec 2001
Posts: 259
Likes: 1
From: Durham, NC
Default Re: Gremlins

Did you end up finding the problem? Hope you got it running....
Reply
Old Apr 6, 2003 | 09:20 PM
  #8  
Lesrace82's Avatar
Thread Starter
TECH Regular
iTrader: (8)
 
Joined: Sep 2002
Posts: 482
Likes: 0
From: Byron, IL
Default Re: Gremlins

I never messed with it anymore. I am just gonna take the computer down to Speed Inc., and let them delete out everything I dont need.
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 Apr 7, 2003 | 11:53 PM
  #9  
John B's Avatar
Moderator
20 Year Member
Photogenic
Photoriffic
Liked
iTrader: (10)
 
Joined: Nov 2001
Posts: 3,264
Likes: 21
From: Phoenix, AZ
Default Re: Gremlins

You don't need the BCM. If you e-mail 70LS1 he can provide you with all the details of how to make the VATS module for about $10 and you'll be set!
Reply




All times are GMT -5. The time now is 04:24 AM.

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