I've searched all over the forums and can't seem to find any info on this topic.
I just installed new spark plugs in my 2000 SC 4R and now I'm having this clicking sound on my speakers when then engine is running and I turn on the radio.
The old plugs were the standard heat range and I was having some HG/LR knocking. I put in new NGK #5509 BCPR7ET spark plugs that are 2 steps colder and it stopped the knocking perfectly....but now the radio has this annoying clicking sound that's driving me nuts! Is there anything that can be done? What would cause this problem anyway? Anyone have ideas?
Thanks....

 

are the plugs resistor type ?

 

BKR5E-11 would be stock so you should be using BKR7E-11 plugs. # 5791

not a big supporter of multi-ground plugs. the part number I gave is for the vpowers. but yes kdo58 the ones he is using are resistor type.

http://www.ngk.com/more_info.asp?AAIA=&pid=41204

 

I just found out what the noise problem is from....it's those damn NGK TE66 spark plug wires I just installed..... The blue ones.
I got sucked into the hype on the box that says: Ultra low resistance (far surpassing OEM wires) That's the problem. Not enough resistance!

Read this I found on a marine forum...but it still applies to us also:

--------------------------------------------------------
"For spark plug wires, make sure to avoid ANY ignition wiring sets that
brag about low resistance, since that is like on the spark plugs needed
to suppress radio noise. Due to how wiring and Ohm's law works, the resistance needed in ignition wiring and spark plugs to eliminate
ignition noise in a radio does not significantly reduce the spark
intensity. There is so little current flowing through ignition wiring
that even the normal high-resistance in ignition wiring does not
significantly reduce the voltage. And don't worry, that extra
resistance is PURPOSELY added to the wiring... it costs more to make it
that way than it would with lower resistance wiring.

So go with standard carbon-impregnated ignition wiring sets and avoid at all costs any so-called "performance" ignition wiring set that talks
about its lower resistance even if it also says it has some lame
"spiral-wrap" technology to reduce noise."

--------------------------------------------------------
So now I have to rip those garbage 'blue' wires out and buy some real
wires that don't have "ultra low resistance" and just have normal
resistance.

The wires I took out were made by Sumitomo and were the original
ones with the date on them. Never had a problem with them other
than they were 10 years old and I figured I would replace them since
I was replacing the plugs anyway.

I thought NGK was a good product. WTF??????

 

Oh yeah...the NGK spark plugs I installed were the resistance ones of course. That's what the big 'R' means. I wouldn't use anything else. That's why it made no sense to use resistor plugs and "ultra low resistance" wires.....but that's what everyone recommended on the forums.

There's nothing wrong with multi-ground spark plugs..In fact that's what
my 4R manual calls for...the dual ground plugs. The 2 or 3 ground plugs
last a lot longer than single ground plugs is also why I use them. That's
all.