When should voltage be present at the coil?

Tiny
GREG_H_69
  • MEMBER
  • 1988 DODGE TRUCK
  • 130,000 MILES
Should I have voltage at the coil as soon as the key is on or only when the motor is cranking/running?
Do you
have the same problem?
Yes
No
Tuesday, May 29th, 2012 AT 11:43 PM

17 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
As soon as the key is turned on.

What is the issue?

Roy
Was this
answer
helpful?
Yes
No
Tuesday, May 29th, 2012 AT 11:51 PM
Tiny
GREG_H_69
  • MEMBER
  • 14 POSTS
I don't have voltage going to the coil. The pcm has been replaced with a re-manufactured one.I put one on and when that didn't fix it I thought it was bad and exchanged it for another one. It ran for about 20 minutes then started acting up again. No voltage at the coil. I then unhooked the power from the coil and ran a jumper from the battery. Still won't start.
Was this
answer
helpful?
Yes
No
-1
Wednesday, May 30th, 2012 AT 11:15 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would look at the ignition switch as the power comes from there not the pcm. If you have your original one, re install it and start from scratch.

Roy
Was this
answer
helpful?
Yes
No
+1
Thursday, May 31st, 2012 AT 12:32 AM
Tiny
GREG_H_69
  • MEMBER
  • 14 POSTS
If it would be that, why won't it start when I run a jumper?
Was this
answer
helpful?
Yes
No
-1
Thursday, May 31st, 2012 AT 12:46 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Because the ignition side feeds more than just the coil.

Roy
Was this
answer
helpful?
Yes
No
+1
Thursday, May 31st, 2012 AT 1:54 AM
Tiny
GREG_H_69
  • MEMBER
  • 14 POSTS
I'll try it. Thanks
Was this
answer
helpful?
Yes
No
+1
Thursday, May 31st, 2012 AT 12:07 PM
Tiny
GREG_H_69
  • MEMBER
  • 14 POSTS
I put a new ignition switch in it. Still doing same thing. It will run sometimes. When it dies and won't start still no power to the coil.
Was this
answer
helpful?
Yes
No
-1
Sunday, June 3rd, 2012 AT 4:19 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did you test for power to the coil on the positive side?

Roy
Was this
answer
helpful?
Yes
No
+1
Sunday, June 3rd, 2012 AT 4:25 PM
Tiny
GREG_H_69
  • MEMBER
  • 14 POSTS
Yes
Was this
answer
helpful?
Yes
No
Sunday, June 3rd, 2012 AT 4:29 PM
Tiny
GREG_H_69
  • MEMBER
  • 14 POSTS
Guys keep telling me pick-up coil. Could this be it?
Was this
answer
helpful?
Yes
No
Tuesday, June 5th, 2012 AT 9:18 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You need to fix the power problem to the coil-the distributor pick-up coil is not gonna operate
Was this
answer
helpful?
Yes
No
+1
Tuesday, June 5th, 2012 AT 11:31 PM
Tiny
GREG_H_69
  • MEMBER
  • 14 POSTS
The pick-up coil sends a signal to the pcm telling it when to send power to the coil and the injectors. I replaced it 2 days ago, runs great now.
Was this
answer
helpful?
Yes
No
Friday, June 8th, 2012 AT 10:28 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
We know that-The distributor pick-up coil controls the coil and injector-been here before-Your welcome
Was this
answer
helpful?
Yes
No
Friday, June 8th, 2012 AT 10:37 PM
Tiny
GREG_H_69
  • MEMBER
  • 14 POSTS
Read what you wrote on June 5.
Was this
answer
helpful?
Yes
No
Saturday, June 9th, 2012 AT 3:40 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
I was giving you a hint-So what's the problem here
Was this
answer
helpful?
Yes
No
Saturday, June 9th, 2012 AT 4:00 PM
Tiny
GREG_H_69
  • MEMBER
  • 14 POSTS
"You need to fix the power problem to the coil-the distributor pick-up coil is not gonna operate" Looks to me like that answer says the pick-up coil is not the problem.
Was this
answer
helpful?
Yes
No
Saturday, June 9th, 2012 AT 5:41 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Oh! Well you got it fixed-Good Luck
Was this
answer
helpful?
Yes
No
Saturday, June 9th, 2012 AT 9:18 PM

Please login or register to post a reply.

Sponsored links