LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

95 LT1 cutting out cruising

Old 10-24-2016, 02:29 PM
  #1  
Registered User
Thread Starter
 
Join Date: Oct 2016
Posts: 2
95 LT1 cutting out cruising

I have a 95 Trans am with the lt1, 4l60e trans. A while back it started cutting out while cruising almost like it's running out of fuel and it randomly does it. I may drive it 200 miles with no problem other times i may drive it 50 miles. It'll run like a champ until it starts cutting out then it'll just keep cutting out until I turn it off and let it cool down or If I go full throttle while it's cutting out it will quit cutting out as long as your at full throttle.

New Parts:
Optispark replaced about 1000mi ago
Plugs and wires
Water pump
Alternator (all wires are tight)
All new gaskets in throttle body
Maf sensor cleaned

Last edited by codyedge1991; 10-24-2016 at 02:30 PM. Reason: Misspelling
codyedge1991 is offline  
Old 10-24-2016, 09:05 PM
  #2  
Registered User
 
Fatdog2's Avatar
 
Join Date: Oct 2007
Posts: 1,174
Re: 95 LT1 cutting out cruising

Are there any codes?The absolute first thing to do is do a fuel pressure check.When the car cuts out again,turn the car off but don't wait for the car to cool down,and use a rubber mallet and hit the gas tank a few times from under the car.If the car starts right up again then it could be the fuel pump.If you have a laptop download GaryDoug 939495 scan tool.You will need a harness.Once you run a scan you can post it here and find some answers.Hope this helps.
Fatdog2 is offline  
Old 10-24-2016, 11:20 PM
  #3  
Super Moderator
 
Injuneer's Avatar
 
Join Date: Nov 1998
Location: Hell was full so they sent me to NJ
Posts: 67,141
Re: 95 LT1 cutting out cruising

Pull the codes. Could be heat soak of the ICM or the optical module in the Opti.

Scan9495:

https://www.camaroz28.com/forums/com...95-lt1-874306/

Heat soak of fuel pump is also possible.
Injuneer is offline  
Old 10-25-2016, 12:57 AM
  #4  
Registered User
Thread Starter
 
Join Date: Oct 2016
Posts: 2
Re: 95 LT1 cutting out cruising

No codes, checked the fuel pressure and its right where it needs to be. And even when the car starts cutting out it will still idle smooth and start right up. It only cuts out when cruising at partial throttle. Doesnt cut out at full throttle or idle.
codyedge1991 is offline  
Old 10-25-2016, 11:16 PM
  #5  
Registered User
 
Fatdog2's Avatar
 
Join Date: Oct 2007
Posts: 1,174
Re: 95 LT1 cutting out cruising

Since nobody else chimed in the past day maybe these things may help.
After market alarm.
Bad or worn key.
Bad key ignition cylinder.
Too much stuff on the key chain(the weight of the keys with all the stuff we put on them can affect something)
There have been numerous posts of defective optisparks even on u-tube.
I blew up an accel coil 10 minutes after I put it on going up a freeway ramp here in L.A.Now that was fun.I've read and saw on u-tube the accel opti's go south usually around 5k or so.
If you have a spare key I would try though first.
A bad connection in the plug harness to the opti spark(they melt)
A bad connection to the water temp sensor in the waterpump.
Even relays coming loose in the fuse box.
These old wires and hoses can get brittle and intermittently break contact especially under heat.
There is a way you can scan the problem while you are driving then when it does happen the scanner should pick up something.Hope this helps.
Fatdog2 is offline  
Old 10-26-2016, 12:57 AM
  #6  
Registered User
 
Fatdog2's Avatar
 
Join Date: Oct 2007
Posts: 1,174
Re: 95 LT1 cutting out cruising

But my money is like Injuneer says-The optical module in the opti.when failing.My02.
Fatdog2 is offline  
Old 10-26-2016, 10:45 AM
  #7  
Super Moderator
 
Injuneer's Avatar
 
Join Date: Nov 1998
Location: Hell was full so they sent me to NJ
Posts: 67,141
Re: 95 LT1 cutting out cruising

Did you actually pull the codes, or just going by the fact the SES light isn't on?
Injuneer is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

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.