My 98 trans am turns on but won't stay on - LS1TECH - Camaro and Firebird Forum Discussion



General Maintenance & Repairs Leaks | Squeaks | Clunks | Rattles | Grinds

My 98 trans am turns on but won't stay on

Reply
 
Thread Tools Search this Thread
Old 03-17-2017, 05:57 PM   #1
Registered User
Thread Starter
 
Join Date: Mar 2017
Posts: 1
Default My 98 trans am turns on but won't stay on

My dad and I have been working on my car to 2 weeks now and can't get it to stay running. It will turn over but won't stay on the longest it's idled for is about 20 seconds. We have replaced the fuel pump, fuel filter and check all the fuses. We have also used a code reader and no codes have came up. We also have good fuel pressure so what could be the problem.
Lorenzo Reyes is offline   Reply With Quote
Old 03-18-2017, 10:57 PM   #2
TECH Apprentice
 
Join Date: Nov 2001
Location: Lititz, PA
Posts: 309
Default

How many miles on the engine?
Has there been any engine work done lately?
Have you looked at the spark plugs? How do they look? Post pics.
Do you have spark at each cylinder?
How about posting a short sound/video for us to listen to?
Have you done a compression check?

I'm sure other members will have more questions.

John
JohnR is offline   Reply With Quote
Old 03-26-2017, 07:36 AM   #3
Teching In
 
Loganvilledude's Avatar
 
Join Date: Feb 2017
Location: Loganville, GA
Posts: 9
Default

You may want to check your throttle body butterfly plate. If there is any carbon build up, it will throw the ecm off. I had this happen to me on several cars and each time it turned out to be the problem. Two weeks ago it happened in my WS6. It will not give you any codes if it is sticking.
Loganvilledude is offline   Reply With Quote
Old 03-27-2017, 11:49 PM   #4
Pontiacerator
iTrader: (12)
 
RevGTO's Avatar
 
Join Date: Nov 2003
Location: Wichita KS / Rancho San Diego
Posts: 5,205
Default

Check the idle air control valve. If it's gummed up and sticking, it could cause this problem.

Also check for any security codes. Although on LS1's usually the car won't start at all if there's a VATS issue, I know that on other GM vehicles of the era, the car will start but not idle if there's a security issue.
RevGTO is offline   Reply With Quote
Old 03-28-2017, 06:09 AM   #5
TECH Senior Member
iTrader: (2)
 
Join Date: May 2008
Location: South Florida
Posts: 10,900
Default

Interesting.....

The only thing that causes my 1998 Trans Am to literally not be able to stay running:

1) Gauge Cluster not installed
2) Bosch 02 sensors installed

My engine will literally backfire, misfire, shake and then stall in both of these situations. ALSO...I have, on two occasions had my Coolant Temp Sensor unplugged and the engine runs terribly and barely stays on.

Check to see if that Coolant Temp Sensor is still plugged in......

The other two things above don't sound like the culprit. Is your gauge cluster working normally.....?

.
LS6427 is offline   Reply With Quote
Old 03-28-2017, 06:11 AM   #6
TECH Senior Member
iTrader: (2)
 
Join Date: May 2008
Location: South Florida
Posts: 10,900
Default

You might want to try to start it.....as someone else grabs the big wire bundle coming directly out of the PCM....over by the passengers side strut tower. As you are starting it, have them move that wire bundle in all directions.....the ground wire inside that bundle may have broken. It happened to me once and it wouldn't let the engine stay running. A guy came to my house, knew exactly what it was.....he cut into the bundle and pulled the wire out. And he grounded it to one of my valley cover bolts. Started up and ran perfect.

.
LS6427 is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
First LS Swap in a Jeep - Won't Stay Running michaelmaxim Conversions & Hybrids 33 10-21-2017 10:21 AM
Cranks but won't accelerate and then dies Airboatls LT1-LT4 Modifications 1 06-11-2017 07:55 AM
Starts but won't idle B_pursell PCM Diagnostics & Tuning 13 01-29-2017 11:53 AM
Please Help ghett0gh0stbusters PCM Diagnostics & Tuning 4 02-18-2016 02:15 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 11:12 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: