dry-fly

I'm about to change the plugs and wires on my 02' LS430.....are the Iridium Denso's or NGK's the "best" to put in there? and the wires.....just use new OEM Lexus or is there an upgrade someone makes?

Thanks guys

warminwisc

Nippon denso are OEM plugs I have 145k on mine with no problems. How long are wires suposed to last?

Lynzoid

There's no wires on the LS... Duh.... It's coil-on-plug...

jimbosr1

nippon denso are no longer together.its just denso now.

warminwisc

No wires thanks one less thing to worry about.

GLIDESUL

I changed my plugs at like 120,xxx my coils are still good at 152,xxx. I'm running ngk iridium. But been debating on going back with denso plugs next time I change plugs around 200-220,xxx. Those coils sure are good quality.

warminwisc

so how many coils are ther, how often do they go, not to often I bet, how much to replace em?

GLIDESUL

Its 8 coils 1 per cylinder.

Lynzoid

Japanese coils are not like 'domestic market car' coils.... Japanese ones never fail... So no need to replace them ever.

warminwisc

Thank you, like everything about this car it is over engineered and at 145 k drives like new.

jmckinley

I have a 2004 LS 430- how often are we supposed to change the spark plugs? every 30k? I did mine at 90k with TB and WP at an independent toyota/lexus shop and now at 111k dealer is recommending it when i do the 120k service.. thanks

curiousB

Plugs are every 110k miles. So if yours were done at 90k with TB then you're good until 200k miles.. Dealer is either ignoring that they were changed at 90k or he's just pumping up the revenue balloon...

Jabberwock

Old school wires had to carry a high voltage charge from a the centralized single ignition coil to each individual spark plug. As a result, the ignition wires had relatively short lifespan.

Modern ignition systems use a individual ignition coil mounted directly over each spark plug (coil on plug) so the ignition wires are really just normal electrical wires that don't carry a heavy high voltage charge and therefore last way longer..perhaps as long as any other normal engine wiring subject to heat, pollutants, etc.

Kira X

iTrader: (24)

I never knew that. Does that apply to most other Lexus models? My SC300 is at 108,000 miles and I think it may have the original spark plugs in it.

curiousB

Coil over plug eliminates the distributor, rotor, cap, and plugs wires. This cost offset is netted against the extra cost of a coil on each plug. The costs of the CoP got cheap enough to make the jump. It now means the spark only jumps the gap in the plug as there is no air gap in a distributor not to mention a few less moving parts to breakdown. So potentially hotter spark, more precise spark firing, and more reliable overall. In all a pretty cool advancement in ignition.