back coil pack on driver side not firing at all "need help"
#1
TECH Regular
Thread Starter
iTrader: (31)
Join Date: Nov 2006
Location: louisiana
Posts: 482
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
![Cry](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_cry.gif)
#4
That's MISTER MODERATOR
iTrader: (9)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
OK, you have either a wiring problem, plug problem or a PCM problem, the latter being the least possible.
Go through the wiring harnesses and unplug/re-plug every plug between the coil and the PCM.
Each side of coils has power off a fuse so it's not blown as the other three on that side are working. The PCM triggers the coil by shunting to voltage low (ground) within the PCM. There's also a referance to low voltage (ground) in the PCM and a external ground.
Little more info on your car, your sig says nothing about it...
Go through the wiring harnesses and unplug/re-plug every plug between the coil and the PCM.
Each side of coils has power off a fuse so it's not blown as the other three on that side are working. The PCM triggers the coil by shunting to voltage low (ground) within the PCM. There's also a referance to low voltage (ground) in the PCM and a external ground.
Little more info on your car, your sig says nothing about it...
#5
TECH Regular
Thread Starter
iTrader: (31)
Join Date: Nov 2006
Location: louisiana
Posts: 482
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
[QUOTE=Paul Bell;11971709]OK, you have either a wiring problem, plug problem or a PCM problem, the latter being the least possible.
Go through the wiring harnesses and unplug/re-plug every plug between the coil and the PCM.
Each side of coils has power off a fuse so it's not blown as the other three on that side are working. The PCM triggers the coil by shunting to voltage low (ground) within the PCM. There's also a referance to low voltage (ground) in the PCM and a external ground.
Little more info on your car, your sig says nothing about it...[/QUOTE
its a customer car im working on and its stock its just somehow it started doing this but i pull the other plug wires and crank the car..they all ark like they are suppose to ..when i back one on the driver side it does nothing like its getting no voltage at all or like it may not have a good ground but i figure it should have a good ground because they rest of them are wrokin perfectly
Go through the wiring harnesses and unplug/re-plug every plug between the coil and the PCM.
Each side of coils has power off a fuse so it's not blown as the other three on that side are working. The PCM triggers the coil by shunting to voltage low (ground) within the PCM. There's also a referance to low voltage (ground) in the PCM and a external ground.
Little more info on your car, your sig says nothing about it...[/QUOTE
its a customer car im working on and its stock its just somehow it started doing this but i pull the other plug wires and crank the car..they all ark like they are suppose to ..when i back one on the driver side it does nothing like its getting no voltage at all or like it may not have a good ground but i figure it should have a good ground because they rest of them are wrokin perfectly
#6
UNDER PRESSURE MOD
iTrader: (19)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Even though you pulled the plug wires, it still doesn't tell you if the coil itself is any good.
Take the coil itself off of #7 cylinder and swap it with another coil. If the problem follows that coil, then it is bad. If it stays at #7, then it's the wiring harness going into that coil. Start then by putting on a voltmeter and crank the car over and see if you are getting voltage to the harness.
Take the coil itself off of #7 cylinder and swap it with another coil. If the problem follows that coil, then it is bad. If it stays at #7, then it's the wiring harness going into that coil. Start then by putting on a voltmeter and crank the car over and see if you are getting voltage to the harness.
#7
TECH Regular
Thread Starter
iTrader: (31)
Join Date: Nov 2006
Location: louisiana
Posts: 482
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Even though you pulled the plug wires, it still doesn't tell you if the coil itself is any good.
Take the coil itself off of #7 cylinder and swap it with another coil. If the problem follows that coil, then it is bad. If it stays at #7, then it's the wiring harness going into that coil. Start then by putting on a voltmeter and crank the car over and see if you are getting voltage to the harness.
Take the coil itself off of #7 cylinder and swap it with another coil. If the problem follows that coil, then it is bad. If it stays at #7, then it's the wiring harness going into that coil. Start then by putting on a voltmeter and crank the car over and see if you are getting voltage to the harness.