LS1TECH - Camaro and Firebird Forum Discussion

LT1-LT4 Modifications 1993-97 Gen II Small Block V8

weird startup question...

Thread Tools
 
Search this Thread
 
Old Mar 29, 2009 | 08:10 PM
Share
  #1  
shutzero's Avatar
shutzero
Thread Starter
TECH Enthusiast
 
Joined: Sep 2008
Posts: 636
Likes: 0
From: Cheshire, CT
Default weird startup question...
so i posted a couple weeks ago about having a sputtering startup...
so i would prime the engine twice and it would start up fine, but if i dont prime it or sometimes only prime it once it sputters or something...im thinking its either the fuel pump regulator or the fuel pump...does anyone know if this is a specific problem for either or if its something else?
Reply
0
Old Mar 29, 2009 | 08:15 PM
Share
  #2  
RamAir95TA's Avatar
RamAir95TA
TECH Senior Member
iTrader: (2)
 
Joined: May 2005
Posts: 9,467
Likes: 8
From: South Jersey
Default
Have you gotten a fuel pressure gauge on the rail and checked for fuel pressure, both key-on engine-off and with the engine running?

Have you pulled the vacuum line off of the regulator and checked for fuel?
Reply
0
Old Mar 29, 2009 | 08:17 PM
Share
  #3  
shutzero's Avatar
shutzero
Thread Starter
TECH Enthusiast
 
Joined: Sep 2008
Posts: 636
Likes: 0
From: Cheshire, CT
Default
havent had a chance to yet, i was hoping maybe they were symptoms of something common...what would the pressures be with key on engine off and engine running?
Reply
0
Old Mar 29, 2009 | 08:20 PM
Share
  #4  
RamAir95TA's Avatar
RamAir95TA
TECH Senior Member
iTrader: (2)
 
Joined: May 2005
Posts: 9,467
Likes: 8
From: South Jersey
Default
Originally Posted by shutzero
havent had a chance to yet, i was hoping maybe they were symptoms of something common...what would the pressures be with key on engine off and engine running?
Approximately 43.5psi with the KOEO. Pressure should drop a few psi with the engine running and slowly increase with throttle position.
Reply
0
Old Mar 29, 2009 | 08:27 PM
Share
  #5  
shutzero's Avatar
shutzero
Thread Starter
TECH Enthusiast
 
Joined: Sep 2008
Posts: 636
Likes: 0
From: Cheshire, CT
Default
like i know it primes it and gets fuel from the gas tank but im thinking maybe its not priming the right amount or something?
Reply
0
Old Mar 29, 2009 | 08:28 PM
Share
  #6  
RamAir95TA's Avatar
RamAir95TA
TECH Senior Member
iTrader: (2)
 
Joined: May 2005
Posts: 9,467
Likes: 8
From: South Jersey
Default
Originally Posted by shutzero
like i know it primes it and gets fuel from the gas tank but im thinking maybe its not priming the right amount or something?
The only way to tell is to get a fuel pressure gauge on the fuel rail. It's a priceless tool that every LT1 owner should have in their toolbox.
Reply
0
Old Mar 29, 2009 | 09:20 PM
Share
  #7  
doug1105's Avatar
doug1105
Teching In
 
Joined: Dec 2004
Posts: 42
Likes: 0
Default
Originally Posted by RamAir95TA
The only way to tell is to get a fuel pressure gauge on the fuel rail. It's a priceless tool that every LT1 owner should have in their toolbox.
Yep- check the pressure at idle and when you drive.
Mine did the slow die-off and would look okay at idle, but would eventually shut off while driving.
Reply
0

Trending Topics

Old Mar 29, 2009 | 09:35 PM
Share
  #8  
shutzero's Avatar
shutzero
Thread Starter
TECH Enthusiast
 
Joined: Sep 2008
Posts: 636
Likes: 0
From: Cheshire, CT
Default
Originally Posted by doug1105
Yep- check the pressure at idle and when you drive.
Mine did the slow die-off and would look okay at idle, but would eventually shut off while driving.
Once I get the car started itn runs fine ithink it has something to do with the pressure at start up
Reply
0
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

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

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

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

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Mar 29, 2009 | 09:44 PM
Share
  #9  
ThoR294's Avatar
ThoR294
TECH Addict
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (6)
 
Joined: Jul 2007
Posts: 2,861
Likes: 4
From: Ringoes/Flemington, New Jersey
Default
check valve in fuel pump could be bad... that is normally the cause of quick pressure loss
Reply
0
Old Aug 4, 2009 | 01:48 PM
Share
  #10  
shutzero's Avatar
shutzero
Thread Starter
TECH Enthusiast
 
Joined: Sep 2008
Posts: 636
Likes: 0
From: Cheshire, CT
Default
all the pressures are fine, i think its actually the starter. when i let the car prime i hear something clanking under the car likes it almost the starter engaging...is this possible? it sounds like the starter gear is getting stripped or something on the flexplate
Reply
0
Old Aug 4, 2009 | 01:52 PM
Share
  #11  
RamAir95TA's Avatar
RamAir95TA
TECH Senior Member
iTrader: (2)
 
Joined: May 2005
Posts: 9,467
Likes: 8
From: South Jersey
Default
Originally Posted by shutzero
all the pressures are fine, i think its actually the starter. when i let the car prime i hear something clanking under the car likes it almost the starter engaging...is this possible? it sounds like the starter gear is getting stripped or something on the flexplate
Pull the inspection/converter cover and find out.
Reply
0
Back to Subforum
LT1-LT4 Modifications
View Next Unread
bad intake gasket?




Advanced Search

All times are GMT -5. The time now is 09:30 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