No spark on passenger side of engine

Tiny
SHANENEALE
  • MEMBER
  • 1999 GMC SIERRA
  • 208,000 MILES
I have a 1999 gmc seirra 1500 4x4 with the 4.8 in it. I get spark on my driverside but I dont get any spark on my passenger side. I reasontly changed the intake manifold on it I dont know if that would have anything to do with it. I had to take off my wiring harnest to change it but I pluged evry thing back in.
Thursday, October 24th, 2013 AT 3:13 PM

10 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
So are you missing the power side to the coil or ground pulse to the coil?
Was this
answer
helpful?
Yes
No
+2
Thursday, October 24th, 2013 AT 3:37 PM
Tiny
SHANENEALE
  • MEMBER
  • 4 POSTS
No I dident mess with that side of the coil packs when I changed it plus two on that side are brand new
Was this
answer
helpful?
Yes
No
-1
Thursday, October 24th, 2013 AT 3:51 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
If your not getting spark to any of the cylinders on the passenger side you have to be missing the power and or the ground pulse to the coils?Simple as that have you checked yet?
Was this
answer
helpful?
Yes
No
+3
Thursday, October 24th, 2013 AT 8:32 PM
Tiny
SHANENEALE
  • MEMBER
  • 4 POSTS
How do you check that
Was this
answer
helpful?
Yes
No
-1
Saturday, October 26th, 2013 AT 7:13 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Do you have a test light light or multi meter?
Was this
answer
helpful?
Yes
No
+1
Saturday, October 26th, 2013 AT 8:16 AM
Tiny
SHANENEALE
  • MEMBER
  • 4 POSTS
Yes
Was this
answer
helpful?
Yes
No
Saturday, October 26th, 2013 AT 9:44 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Alright with a test light with the key in the run position pin D on the connector going to the coil should have power to it on all four of the connectors. Also Pin C on the connector should have a flashing ground while cranking. Pin A to the connector should have a constant ground to it.
Was this
answer
helpful?
Yes
No
+1
Saturday, October 26th, 2013 AT 5:03 PM
Tiny
DM AUTO
  • MEMBER
  • 2 POSTS
No ground pulse.
Was this
answer
helpful?
Yes
No
Thursday, May 3rd, 2018 AT 4:00 PM
Tiny
DM AUTO
  • MEMBER
  • 2 POSTS
Did your test everything but ground pulsing?
Was this
answer
helpful?
Yes
No
+1
Thursday, May 3rd, 2018 AT 4:00 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,675 POSTS
This sounds like you lost the coil drivers inside the PCM which means it needs to be replaced. Here is the location.

You may be able to get a used one and plug it in to confirm the issue.

Check out the diagrams (below).

Please let us know what you find. We are interested to see what it is.

Cheers, Ken
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
+4
Sunday, May 6th, 2018 AT 4:38 PM

Please login or register to post a reply.

Related No Spark Content

Ignition Spark Check
GUIDE
Ignition Spark Check
An engine's ignition system is responsible for igniting the fuel-air mixture inside the combustion chamber and when the ignition process stops the engine will not run....
VIEW MORE