I have a 1995 buick lesabre with 105,000 mi on it. It was running fine then
Yesterday. I went to start it today It was cold -13 and it would not start.
Checked the battery, it was real low. Ok fine I left a charger on it all
night at 2amps auto. In the morning checked the battery again now up to 14.4
volts. Still noticed a little ice on top of acid in 3 cells. Anyway tried to
start it, It will start and run as long as the starter in engaged, sometimes
backfires. As soon as I release the starter it quits. In older cars I would
blame the ballast resister but I don't think they use them anymore. SOoo..
my problem is Starts-runs-sometimes backfires- release the key- dies.
BTW the main computer was replaced about 35,000 mi ago. Any Advice on how
to diagnose this problem? Don't have an OBD-11 but I suppose I could buy
one if I had to . Thought mabey somebody on this group has run into this
problem before and knew what is was. Any Help would be appericated.
The main problem is that it Will start but will only run as long as the
switch is held in the start position, let it back to run and the engine
quits, if I force the issue it will sometimes backfire too.
Well guess its the process of discovery, when the weather warms up now its
about -3 below zero. our is the back yard. Thanks for the reply, Tom
Check the Ignition fuse in the fuse box. If it is blown it can do this.
What the problem comes from is the run circuit is being broken when the
key comes back from the start position. It could also be a bad ignition
You are correct. The 1995 LeSabre is what is called a "transistion
vehicle" AKA OBD 1.5 - OBDI electrical interface (12-pin plug) but PCM
outputs OBDII codes. Damn few "civilian" model scanners will work
properly with these cars (my '94 Regal is also so afflicted).
Backfire makes me think bad spark timing or possibly crossfire
Thanks for the reply, The plug wires are 2 years old [about 11,000 miles]
It doesnt backfire all the time. just when the battery gets low. So far I
have checked the fuses, their good. Checked the ign switch by using The dash
lights, they dim when the switch is turned to 'start' the engine starts runs
fine, then when I release the switch to the run position the engine dies
immediately. If I keep hitting the key to start it will sometimes backfire.
The battery is about 5 years old and I am off to get another one today but I
doubt that will make any difference, But Hey! it cant hurt. I got a Dodge
truck so i'm not without wheels anyway. I would be interested in how to
test the ignition switch more that just seeing the dash lights dim when the
starter is engaged. Anyway off to the battery buying for now
Thanks again Tom A. Shure wish I had a warm area to work in,
its -3 today.
Turning the ignition switch to start doesn't check the run position.
The problem you have is being caused by the power to the ignition being
cut off when you allow the key to return to the run position. The
occasional backfire is because of the loss of power allowing the fuel to
build up in the engine. Then when you try to start it that fuel gets
ignited and you get a backfire.
Go under the hood and see if you have voltage to the coil pack (pink
wire) with the key ON (not start). If you don't trace the power lead
back till you find power.
You will find power at the tan/black wire when the key is turned to start.
You have checked ALL the fuses correct. There is one in the relay center
as well as the fuse panel.
I'd think it was the ignition switch myself. About the only way I can think
of to test it would be to remove it. The dash lights dimming is not a valid
test. They're going to dim from the load of the starter.
Ok, Got new battery in- same problem. Also checked all the MAX fuses on the
firewall panel, They are all good. Guess all thats left is wire tracing and
removing the ign switch. Also tried 2 different security keys just to see if
that would change anything- Nada. Got to look up how to remove the ignition
switch somewhere. The weather hasn't got above 0 yet today, Dammed if I
know why I still live here in this climate. Oh Well, bundel up and get back
Thanks again for the replys Tom A
Does the car run at all? While running, are any dummy lights on?
If it doesn't run, turn the ignition key on and watch the warning lights.
After the car is done it's bulb check, what lights are still on?
No- it only runs for about 1-2 secs while the switch is in the start
position. I just realized that even if I hold the switch in the start
position the engine still dies in 1-3 seconds. Little hard on the starter
After bulb check oil, volt, temp, check, and seat belt lights stay on.
If I try the start, only the volt and temp and seatbelt light stay on after.
All the lights go out when the engine does it's short little run. Does that
mean something? Well back at it I guess. Tom A
Yes. Your battery light should not be on after a bulb check.
First, check the "ENG EMIS" fuse in the Underhood Electrical Centre #1, it's
the one on the passenger side.
If it's okay, disconnect the alternator connector. Not the big wire going to
the battery, the little plug. Turn the ignition to the "RUN" position. Does
the battery light come on? If not, replace the alternator.
This 1995 lesabre does not work that way. All the bulbs come on when the
key is turned to run and "Stay on" untill the key is turned to the start
and back. "Battery, temp, oil, and engine check come on and stay on,"
Security and air bag are intermitten. They [security, air bag] flash and
go out seems like when they feel like it.
I got a question, Would a code reader [of any kind] shed any light on this
no run condition?
Thanks Tom A
Code reader only works if the check engine light came on and there is a code
Unfortunately, I'm going from memory because I no longer have a GM in my
possession, but the VOLT light should come on and go out after a few seconds
after switching to the "run" position and definatly after starting. I'm
reading through the service manual and it doesn't state this fact, but I'm
99% sure that's how I remember it. Anyone with an early 90s GM can verify:
does the battery light go out a few seconds after switching to "run?"
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