Spitfire & GT6 Forum

The Prius took me 2 1/2 hours. Spitfire about 15 mins.

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Initializing Built In Test...Waiting...Waiting...Testing... ...Number 3 Variable But Functionally Equal.

J.T.
But the Prius only needs them in what? 100 K miles? If so you will spend about the same amount of time over that mileage.
All the best,
Paul

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TRF# 10423

True that! Many more fasteners involved though. And numerous opportunities to loose a 10mm socket.

Depends on what plugs are used.
Plugs don't really 'wear out', the electrodes erode, and deposits accumulate that cause ignition misfires.

The Prius has higher CR, makes more HP, higher RPM redline, operates at higher engine temperatures, with leaner mixtures and higher spark voltage.
All factors that tend to erode spark plug electrodes and accumulate more plug deposits, that lead to misfires.

The difference is plugs designed in 1950's using the materials and technology of the day to meet contemporary needs and consumer expectations,
vs
plugs designed 50 years later using modern materials and technology to meet EPA fuel system durability laws and consumer expectations.

A modern ignition system can reliably fire plugs that would leave a car with conventional ignition parked on the side of the road.

For example, my 1999 Ford EDIS ignition system equipped truck developed an intermittent miss at around 110K miles.
When I finally removed the original spark plugs, the gaps had eroded to more than 100 thou, about 1/8", so fitting new plugs fixed the issue.

Sure, you can just re-adjust the gaps, but when it takes a lot of time and effort to get at them to remove the plugs,
IMHO it's a 'false economy' to not just replace them at that point.

Toyota says replace the plugs at 120k. They are non adjustable iridium spark plugs. I'm doing what the manufacturer recommends on this car. The Triumph, Hell if it sputters, may need the points cleaned, might be the plugs, could be the carbs, might be doing it because it's a Triumph and felt like it.

You're a better man than I am, JT. I won't even open the bonnet on my Prius But the Spitty is FUN

Har! Same here except for the basics. We take it to the dealer every 5k for oil changes. They always note down what it needs and my wife calls and asks me, yay or nay. This time it was trans oil change (yay) rear brake pads and spark plugs (nay) The plugs weren't much fun but the rear pads were a breeze.