Just a thought. Since a lot of you are working on GMC that have been
unkempt as they should be your engines might have more dirt on them
around the plug area. it might be very wise to try to use a paint brush
or air is better to clean that area up. Then before replacing the plug
go to NAPA and get the Plug chaser to clean up the holes. It will
remove the carbon if any and clean the threads. Next wipe each new plug
with a cleaning solvent or WD 40 works equally well and run the plug in
to hole to where it seats and then apply about 1/4 turn with the socket
or about 5 lb torque. Remove and clean the wire and apply some of the
boot silicone to the part that hooks to the ceramic or top of the spark
plug prior to installing the boot. This make is much easier to remove
and insures a good seal. I still recommend getting rid of the plugs
early on if you go up and down hills like in California, Colorado or
places that have hills to go up and down. Your engines work very
efficient with new plugs and they are not expensive to speak of. You
will note that your control module lasts longer too. I have not
replaced one in many years. I still keep a spare. When I first got the
GMC I was gapped at .0080 and the control modules in the distributor
kept going out. I then read about the GMC and it's .0060 to .0065 and
tried that and no more trouble. I did add the JACOB'S unit and their
wires and have noted a remarkable improvement everywhere. Even though
the engine compartment is spotless I still use the thread chaser too
just in case. It cost about 7 dollars. Chuck in Lompoc.
unkempt as they should be your engines might have more dirt on them
around the plug area. it might be very wise to try to use a paint brush
or air is better to clean that area up. Then before replacing the plug
go to NAPA and get the Plug chaser to clean up the holes. It will
remove the carbon if any and clean the threads. Next wipe each new plug
with a cleaning solvent or WD 40 works equally well and run the plug in
to hole to where it seats and then apply about 1/4 turn with the socket
or about 5 lb torque. Remove and clean the wire and apply some of the
boot silicone to the part that hooks to the ceramic or top of the spark
plug prior to installing the boot. This make is much easier to remove
and insures a good seal. I still recommend getting rid of the plugs
early on if you go up and down hills like in California, Colorado or
places that have hills to go up and down. Your engines work very
efficient with new plugs and they are not expensive to speak of. You
will note that your control module lasts longer too. I have not
replaced one in many years. I still keep a spare. When I first got the
GMC I was gapped at .0080 and the control modules in the distributor
kept going out. I then read about the GMC and it's .0060 to .0065 and
tried that and no more trouble. I did add the JACOB'S unit and their
wires and have noted a remarkable improvement everywhere. Even though
the engine compartment is spotless I still use the thread chaser too
just in case. It cost about 7 dollars. Chuck in Lompoc.
