HELP!!! LT1 stalling? - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums

Welcome to - please click here to register...

LinkBack Thread Tools
post #1 of 2 (permalink) Old 03-22-2011, 05:45 PM Thread Starter
Regular Member
Join Date: Mar 2011
Location: South of Atlanta GA
Posts: 111
HELP!!! LT1 stalling?

First off, Great site!

2nd off... Here's the sticky.

I just recently purchased a 94 Formula Firebird, LT1 T56.... great car, i love it with a passion.... it has a JASPER remanufactured crate engine Less than 5000 miles on it, cost over 8 grand to build. MSD optispark, Flowmaster headers, full flowmaster kit exhaust, lightened flywheel, lots of power, lots of noise, perfect. well kind of.... on 3 occasions now, its just died... like i turned off the ignition to it. the engine is about 3 years old since build, (former owner) and i dont' quite know what all parts are in this beast... when it stalls, it literally just turns off, no warning, but starts right back up, either via starter or popping the clutch. the Service Engine Soon light is on, and its throwing 4 codes. a LOW TPS Voltage code, a AIR system code, and 2 AC system codes (its disconnected). My guess is one of two problems... either a faulty MSD Optispark... note it was brand new during install... less than 5k miles... or a fuel pump relay... or some other ignition controled relay.... mabey getting too hot or failing somehow... if anyone has had this issue or has any ideas please please please shoot it to me... two of the times its stalled its done it while driving/cruizing. once it was during idle.

Thanks!!!! i have two other problem posts so please check them as well.
Gamikatsu is offline  
Sponsored Links
post #2 of 2 (permalink) Old 03-22-2011, 07:37 PM
Global Moderator
cocobolo95's Avatar
Join Date: Sep 2008
Location: Fruitland Park,Florida
Posts: 12,017
These cars have problems with the icm (ignition control module) failing when hot, but I don't think thats your problem, as when they cut off when hot, they usually take some time to cool off before engine will start again. I would look in the tps area, you have a code , low tps reading, and that could cut the engine off. If you could attach a scanner, obd1 type, the newer obd2 scanners won't read your car. Do a real time running scan while you drive and have an assistant scroll down the sensor list and pay particular attention to the tps. See what it does when the car shuts down. If it reads normal while running and voltage drops when car dies, theres your problem. If not you will have to check other areas. Go to he has a wealth of lt1 info & testing procedures on his site. And may I suggest getting a GM factory repair manual. Indispensable.
cocobolo95 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