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

wont start

Thread Tools
 
Search this Thread
 
Old May 7, 2023 | 03:45 PM
  #1  
lilrobo's Avatar
Thread Starter
On The Tree
 
Joined: Sep 2014
Posts: 119
Likes: 0
From: Lexington KY
Default wont start

i have a 55 chevy i did a 53 swap in, all was great been driving for 8 years i guess maybe more , this is second time , the first time my car wouldnt start i pulled my hair out trouble shooting and finely changed battery and started right up, this time i drove to town to car meet and drove home washed and cleaned it and must have left the door ajar or something it cranks fine but i only here the fuel pump for a sec, normally i here it longer, i got a new battery and same thing.
so my question is why ? its cranks fine ( fast ) but no fuel pump or hit
the first time i checked the fuel pressure and 2 relays found nothing all i did was charge the battery, this time must be something different . iam going under and check all my grounds .
what else can i check ?
Reply
Old May 7, 2023 | 08:11 PM
  #2  
slothman's Avatar
Launching!
 
Joined: May 2023
Posts: 286
Likes: 94
From: AZ
Default

motor needs: fuel, spark, compression

battery is good as you say. I would test starter and alternator. easy to check.

After that I would check fuel pressure. Also check for spark at the plugs.
Reply
Old May 8, 2023 | 04:31 AM
  #3  
lilrobo's Avatar
Thread Starter
On The Tree
 
Joined: Sep 2014
Posts: 119
Likes: 0
From: Lexington KY
Default

i did all these things the last time it did this, the common thing i notice the fuel pump only runs for a sec at most, it normally runs longer 5 or 5 sec ? ill check pressure at fuel rail and see what i have to start with, if i have 58 or so after it shuts off ill go on to something else
thanks
Reply
Old May 8, 2023 | 10:37 AM
  #4  
lilrobo's Avatar
Thread Starter
On The Tree
 
Joined: Sep 2014
Posts: 119
Likes: 0
From: Lexington KY
Default

it cranks good , i swapped the relays and no good , ill check fuel pressure at rail and check spark .
where can i get a diagram for wiring ?
Reply
Old May 8, 2023 | 03:31 PM
  #5  
cdk4219's Avatar
TECH Regular
20 Year Member
 
Joined: Feb 2002
Posts: 426
Likes: 45
From: ohio
Default

For what? The 55 Chevy, the unknown year or vehicle 5.3, or the possible aftermarket harness.
Reply
Old May 8, 2023 | 03:35 PM
  #6  
cdk4219's Avatar
TECH Regular
20 Year Member
 
Joined: Feb 2002
Posts: 426
Likes: 45
From: ohio
Default

Maybe you should pull the codes, that may be a great starting point, and where I would start.
Reply
Old May 8, 2023 | 06:47 PM
  #7  
lilrobo's Avatar
Thread Starter
On The Tree
 
Joined: Sep 2014
Posts: 119
Likes: 0
From: Lexington KY
Default

yea 55 chevy i did a 5.3 from a 06 truck
Reply
Old May 8, 2023 | 06:48 PM
  #8  
lilrobo's Avatar
Thread Starter
On The Tree
 
Joined: Sep 2014
Posts: 119
Likes: 0
From: Lexington KY
Default

no codes that my problem , i dont remember the name of after market harness
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 May 8, 2023 | 07:51 PM
  #9  
slothman's Avatar
Launching!
 
Joined: May 2023
Posts: 286
Likes: 94
From: AZ
Default

might be a good time to invest a good obd2 scanner. would recommend a Xtool D7. it's basically a small computer. will tell you everything you need to know.
Reply
Old May 9, 2023 | 10:42 AM
  #10  
lilrobo's Avatar
Thread Starter
On The Tree
 
Joined: Sep 2014
Posts: 119
Likes: 0
From: Lexington KY
Default

i went out this morning and plugged in both relays and checked to see and it started the fuel pump ran like it should the 3 to 5 sec. so now i have to wounder did i have a stuck relay ? and if so why , its been like 8 to 10 years on the build, the brand is hella should be a good, so anyway i will start carrying a extra relay in glove box
Reply
Old May 9, 2023 | 10:57 AM
  #11  
lilrobo's Avatar
Thread Starter
On The Tree
 
Joined: Sep 2014
Posts: 119
Likes: 0
From: Lexington KY
Default

I went out this morning and plugged in relays and turned the key on and heard the fuel pump for the long term and started right up, could I have had a bad relay or stuck relay ? is there a better relay to get ?
Reply
Old May 9, 2023 | 07:24 PM
  #12  
lilrobo's Avatar
Thread Starter
On The Tree
 
Joined: Sep 2014
Posts: 119
Likes: 0
From: Lexington KY
Default

is there nay relays better than others? mine is a hella brand
Reply




All times are GMT -5. The time now is 08:39 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