Engine LT1 Stalls/dies after 15-30 mins, doesnt start again for 15 mins - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums

Welcome to LS1LT1.com/LS3forums.com - please click here to register...

LinkBack Thread Tools
post #1 of 3 (permalink) Old 05-13-2017, 09:36 PM Thread Starter
Regular Member
Join Date: May 2016
Posts: 5
Post Engine LT1 Stalls/dies after 15-30 mins, doesnt start again for 15 mins

Hello Fellow American Muscle owners,


I have a 1994 z28 Camaro, with the LT1 Engine (V8 5.7L)


I have had issue with stalling after 15-30 mins after running. There is no check engine light for this issue
I know there may be other posts on the forum for my current issue, but I wanted to create this post for a trouble shooting guide for myself.

REPLACED PARTS: (shotgun trouble shooting, I know I'm bad....)

Fuel pump (Was tested proper pressure is being delivered [AC-Delco]) (Used the "Hatch" method)
fuel filter (Replaced with Fuel pump)
Opti-spark (Laser, Rotor, and Cap) (Also Tested)
Coil pack and ICM module (Coil replaced twice and tested, ICM replaced twice, both spaced from the engine)
Spark plugs and associated wires (Why not im already underneath the thing)
Checked wiring harness for breaks and short (mainly round ICM)


Before the engine dies, it stumbles a little bit, then dies. After it dies, it cant be restarted for about 10-15 mins.


The thoughts I have on this would be the security system for the Z28, possibility a faulty system that may cut power to the injectors?
I haven't checked voltage in the injector wiring (as from what I read the Security system cuts power to the injectors).
I did not check the connectivity of the pins in the wiring that connect to the coilpack/ICM (I have seen online that it may be an issue)

Any extra thoughts towards this problem would be much appreciated.


What would be the proper trouble shooting methods for fixing this? I have put so many parts and money and time into this car! I've brought it to mechanics, and they couldn't figure it out.

Mainly I'm requesting input for this project, I really don't want to give up and sell the car for part, as I have put so many parts into it, please help. Any input is helpful.

Cars I own:

1994 Chevy z28 Camaro 4AT (The Toy)
2009 BMW 335xi 6AT (The Power Commuter)
2000 Cadillac El Dorado ETC 4AT (The Thing)

Used to Own:

2008 BMW 328xi MSport 6MT (Sniff I miss you dearly)
2002 Cadillac SLS 4AT (Damn thing sucks)

Picture of Cammy below (Those are Vette rims...)
Attached Images

I'm A catifish lover
grinningdude is offline  
Sponsored Links
post #2 of 3 (permalink) Old 05-14-2017, 10:24 AM
Regular Member
shoebox's Avatar
Join Date: Aug 2006
Location: Little Rock, AR
Posts: 6,331
First thing is scan. There are silent trouble codes relating to ignition that don't light the check engine lamp. They should be retained in memory.

Also, during the time it won't start, check the fuel pressure. Pumps can overheat and shut down, then start back up when they cool.
shoebox is offline  
post #3 of 3 (permalink) Old 05-14-2017, 08:43 PM
Regular Member
Join Date: Mar 2016
Posts: 9
Sounds like a coil to me what did you get as a replacement

Sent from my SM-G920V using Tapatalk
aroberson77 is offline  
Sponsored Links


Quick Reply

Register Now

In order to be able to post messages on the LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome