10-10-2015, 12:36 AM
i have more rules for working HV circuits, (i worked on huge military systems with this, so...)
the HV circuits.
should not be allowed to go open circuit, (or short it to ground directly ) 2 rules, keep the outputs loaded at all times the spark plugs have what is called plasma resistance. let it do that.
shorting a coil just asks for trouble. never short it to ground.... (with out the right gap)
this OPEN circuit state, invites, break down or flash over. (induction coils do that, they can spike to real high voltages , unloaded)
imagine if the coil was dirty on the outside.
then you unplugged the spark plug wire in any way, this causes a total open circuit state.
the Coil will and can flash over, what if that flash over, followed all that dirt or worse carbon there and ended up on the 4 pin primary pins.
this will blow the ECU to hell. if you are holding said coil you blow up.(SHOCKED badly)
can be many failures inside ECU now., many transistor blown up. ever seen lightning damage, same.
ive worked complex ATE systems that test circuit boards. that were lightning damaged, and replaced 10 chips to get it going again.
in some cases it fails again. due to the wounded effect, (we call that the walking wounded in the lab)
use real spark plugs (new) and wires to test coils, never short them or run them open and never have problems.
also running old spark plugs risks , the coils to breakdown, in fact it can flash over the the primary side and blow that up.
this is why turn ups should never be skipped.
here is good site that warns of these issues
http://www.aa1car.com/library/ignition_coils.htm
and never run carbon spark wire, ever.
kick those to the curb now,. they all have short short lives. and if open they can kill a good coil.
there are 3 wire types.
carbon
solid wire (never use this) its for old magneto cars. (race)
mag wire, this is still wire, but is Inductive, it uses Inductance to create a resistance, NGK sells it and all top Bosch wires us this, and is BEST in all cases.
both carbon wire and mag are EMI interference rated. (radio noise suppression rated) the latter is like $1 wire, and is seen on new cars due to its dirt cheap cost.
the later, is more expensive in short terms thinking, but not long term.
The carbon just hates vibration, guess who vibrates on cars.>????? everything/one.
see carbon junk here, at "fold back"
https://www.oldbritts.com/51_150102.html
flash over
https://youtu.be/xXAFQa0R9hA?t=9
id not use water, that dumb idea invites the HV energy JUMP and go to the primary pins and burn the ECU up.
but it is old skool. that is what it is.
if the spark parts are old, why not nut just do the tuneup, all parts , in this case, wires ,coil and spark plugs.
with distributors, cap,rotor,wires. plugs.
if the coil looks ok, no carbon tracking they are mostly ok.
keep it clean, on the outside and no corrosion in the lugs.
these are comments on how to keep the ECU running, after its fixed,
the HV circuits.
should not be allowed to go open circuit, (or short it to ground directly ) 2 rules, keep the outputs loaded at all times the spark plugs have what is called plasma resistance. let it do that.
shorting a coil just asks for trouble. never short it to ground.... (with out the right gap)
this OPEN circuit state, invites, break down or flash over. (induction coils do that, they can spike to real high voltages , unloaded)
imagine if the coil was dirty on the outside.
then you unplugged the spark plug wire in any way, this causes a total open circuit state.
the Coil will and can flash over, what if that flash over, followed all that dirt or worse carbon there and ended up on the 4 pin primary pins.
this will blow the ECU to hell. if you are holding said coil you blow up.(SHOCKED badly)
can be many failures inside ECU now., many transistor blown up. ever seen lightning damage, same.
ive worked complex ATE systems that test circuit boards. that were lightning damaged, and replaced 10 chips to get it going again.
in some cases it fails again. due to the wounded effect, (we call that the walking wounded in the lab)
use real spark plugs (new) and wires to test coils, never short them or run them open and never have problems.
also running old spark plugs risks , the coils to breakdown, in fact it can flash over the the primary side and blow that up.
this is why turn ups should never be skipped.
here is good site that warns of these issues
http://www.aa1car.com/library/ignition_coils.htm
and never run carbon spark wire, ever.
kick those to the curb now,. they all have short short lives. and if open they can kill a good coil.
there are 3 wire types.
carbon
solid wire (never use this) its for old magneto cars. (race)
mag wire, this is still wire, but is Inductive, it uses Inductance to create a resistance, NGK sells it and all top Bosch wires us this, and is BEST in all cases.
both carbon wire and mag are EMI interference rated. (radio noise suppression rated) the latter is like $1 wire, and is seen on new cars due to its dirt cheap cost.
the later, is more expensive in short terms thinking, but not long term.
The carbon just hates vibration, guess who vibrates on cars.>????? everything/one.
see carbon junk here, at "fold back"
https://www.oldbritts.com/51_150102.html
flash over
https://youtu.be/xXAFQa0R9hA?t=9
id not use water, that dumb idea invites the HV energy JUMP and go to the primary pins and burn the ECU up.
but it is old skool. that is what it is.
if the spark parts are old, why not nut just do the tuneup, all parts , in this case, wires ,coil and spark plugs.
with distributors, cap,rotor,wires. plugs.
if the coil looks ok, no carbon tracking they are mostly ok.
keep it clean, on the outside and no corrosion in the lugs.
these are comments on how to keep the ECU running, after its fixed,
http://www.fixkick.com