Spark Plug Leads (HT)

[2win2rbo]

I have checked the resistance of my spark plug leads and they're around 9.500 to 10,000 ohms currently. Toyota's resistance limit for the spark plug leads is 25,000 ohms. I am not really sure whether I should change mine now. Also, I was offered a good deal with TRD HT leads. Has anyone tried this product or do they make that much difference with the stock ones? Do I really have to change my HT leads?

[JohnGD]

If you don't have problems they're probably not necessary.

However, if you really want to change them, go with NGK wire set and NGK Iridium-IX plugs. check rockauto.com for prices and use the TN 5% discount.

How many miles on the plugs and wires? Do the plugs first when the time comes and tell us if you feel any difference on acceleration. I'd recommend using a torque wrench to 13 lb/ft. Like the on sale <$15 Harbor Freight 3/8". There are coupons in tuner magazines for $9.99:

http://www.harborfreight.com/cpi/cta...Itemnumber=807

Edit:
Pardon me. Just noticed you're in NZ.

Originally Posted by 2win2rbo

I have checked the resistance of my spark plug leads and they're around 9.500 to 10,000 ohms currently. Toyota's resistance limit for the spark plug leads is 25,000 ohms. I am not really sure whether I should change mine now. Also, I was offered a good deal with TRD HT leads. Has anyone tried this product or do they make that much difference with the stock ones? Do I really have to change my HT leads?

[2win2rbo]

Originally Posted by JohnGD

If you don't have problems they're probably not necessary.

However, if you really want to change them, go with NGK wire set and NGK Iridium-IX plugs. check rockauto.com for prices and use the TN 5% discount.

How many miles on the plugs and wires? Do the plugs first when the time comes and tell us if you feel any difference on acceleration. I'd recommend using a torque wrench to 13 lb/ft. Like the on sale <$15 Harbor Freight 3/8". There are coupons in tuner magazines for $9.99:

http://www.harborfreight.com/cpi/cta...Itemnumber=807

Edit:
Pardon me. Just noticed you're in NZ.

The plugs have done 30,000 km and the leads have done 200,000 km = not changed since the engine was new. I'm not really sure whether the leads have to be replaced on a regular basis even though there wasn't any misfire on any of the cylinders.

[JohnGD]

Generally the wires don't need to be replaced if they meet resistance specs. However, this does not mean they are fine.

People also do addition tests, such as water mist in the dark, to see if they arc electricity. But this is typically done "after the fact" where there were problems.

Sure, if you want to do things preventatively and if you're willing to spend, that would be fine. People do that with coolant hoses, thermostats, and radiators, where there are no specified replacement intervals.

In the US we can get NGK wire sets and Iridium-IX plugs. Good stuff.

Originally Posted by 2win2rbo

The plugs have done 30,000 km and the leads have done 200,000 km = not changed since the engine was new. I'm not really sure whether the leads have to be replaced on a regular basis even though there wasn't any misfire on any of the cylinders.