Engine missing on 93 LT1
Thread Starter
Instructor
Joined: Jul 2011
Posts: 110
Likes: 0
From: Weaverville California
Engine missing on 93 LT1
I have replace the opti-spark, plug wires, plugs, also had the injectors rebuilt, replace 02 sensors and cats but still there is a miss. Any ideas EGR valve possibly. thanks
Safety Car
Joined: Sep 2010
Posts: 3,752
Likes: 190
From: Indiana PA
When does the miss occur, hot, cold, warm, cool, under heavy load, idle, light load,etc....
Have you done any tests other than replacing parts?
Is the car ever hard to start?
Codes?
Do you have a FSM?
Have you done any tests other than replacing parts?
Is the car ever hard to start?
Codes?
Do you have a FSM?
Intermediate
Joined: Mar 2012
Posts: 35
Likes: 0
From: Stafford VA
Have you looked around the garage to see is the engine is hidden under a tarp or blanket? Try thinking about the last place you saw your engine and back-track from there.
*sorry for the useless post, but based on the title it had to be done*
*sorry for the useless post, but based on the title it had to be done*
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
In addition.
Just for a starting point, if the miss is during idle, start pulling plug wires or injector plugs and see if you can localize it to a cylinder. Then you might be able to find a problem. Also look for a wire sparking to ground.
Have you done a compression check?
Just for a starting point, if the miss is during idle, start pulling plug wires or injector plugs and see if you can localize it to a cylinder. Then you might be able to find a problem. Also look for a wire sparking to ground.
Have you done a compression check?
Thread Starter
Instructor
Joined: Jul 2011
Posts: 110
Likes: 0
From: Weaverville California
The miss seems to be in closed loop not when I first start it but within 30 sec or so. Also code 43 ESC/knock sensor and 32 EGR system fault. I replaced the parts trying to get the car to pass CA smog. It passed with the cats. The miss is still there. I first thought the miss was at idle but when they were testing for smog at 2500 rpm I noticed the miss. Cant tell when driving.
Safety Car
Joined: Nov 2008
Posts: 4,328
Likes: 15
From: Jacksonville FL
No offense on the noOb, just new to us. Welcome humor master!
