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post #1 of 23 (permalink) Old 01-31-2007, 11:06 PM Thread Starter
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Default Spark plugs

I went to get my Prius inspected and I was waiting and I saw some Bosch platinum 4 prong spark plugs that say they're better than iridium (sp) According to the guy at the shop, he said "the prius doesn't need spark plugs" I was like this guy doesn't know what he's talking about, asked the guy in parts and had a listing for plugs. Unfortunately the plugs i wanted wern't on the list to have. There was another kind that I was vaguely familiar with. Would Bosch platinum burn out the ICE?

When I had Bosch platinum 4's in my 2000 Neon, the plugs were tight, but in cylinders # 4 and # 3, there was oil on the plug, not much in 3, but alot in 4. I wonder if the plugs were respnsible for excessive power and pushing the liston too hard. I know you gotta be careful with them being too tight or they can shatter.

Now with the Prius, should you do the spark plug change yourself?
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post #2 of 23 (permalink) Old 02-01-2007, 01:16 AM
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What the tech may have meant by 'The Prius doesn't need sparkplugs' may have meant they aren't required to be replaced yet. If he really does believe there are no sparkplugs in the Prius, I would be curious as to what he thinks ignites the fuel mixture in the cylinders.

The plugs are only scheduled to be replaced at 120K miles. I believe the Prius uses platinum plugs. 'specialty' plugs are usually found to not offer much benefit, especially for the costs.
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post #3 of 23 (permalink) Old 02-01-2007, 03:26 PM
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Platinum plugs are fine for lean and clean-running engines without a lot of miles. Older oil-burners will probably foul them and it will not run well.

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post #4 of 23 (permalink) Old 02-01-2007, 04:05 PM
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Quote:
Originally Posted by DanMan32
If he really does believe there are no sparkplugs in the Prius, I would be curious as to what he thinks ignites the fuel mixture in the cylinders.
Maybe he thinks its a diesel.
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post #5 of 23 (permalink) Old 02-01-2007, 05:20 PM
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Platinum plugs were developed when spark plugs became almost impossible to replace because of location in car engines. Standard plugs "burn" over time and the gap widens until some cylinders start mis-firing. Hence during the "old" tuneup days the gap on plugs were always reset.
In 1993 Cadillac hit the market with the "Northstar" engine and came out with the first no maintanence for the first 100,000 miles ad. They had to install platinum plugs for this statement to be made. Since then most frontwheel drive cars have gone to the platinum because of the difficulty of reaching the rear plugs. The V6 engines the Japanese came up with had to have the entire fuel injection system removed to get to the plugs and so switched to platinum there. Now they are well worth the cost and practically standard everywhere. The platinum tips will not deterioate and never need to be re-gapped.
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post #6 of 23 (permalink) Old 02-01-2007, 05:32 PM
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I also thought the 50,000 mile emissions warrantee led to platinum plugs, so that there was not a big bill associated with the maintenance the automaker must specify for that interval. Since regular plugs must be cleaned and regapped at 12-15,000 miles, this labor adds up, especially at dealer labor rates. Plats let them fuggedaboudit.

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post #7 of 23 (permalink) Old 02-01-2007, 09:51 PM
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That's one I had never heard of before. Here the car is warranted for 100,000 miles before a plug change is recommended. But here you have to pass an emmission check every two years and I would guess if you didn't pass, the repair to do so would probably mean a new set of plugs.
This is for my Highlander V6. I don't really know what I'm paying for in regard to the emmision testing requirement for the Prius.
(Oh, and as for the 100,000 mile platinum plug change in the aluminum block Northstars I have heard of several owners who were foolish enough to attempt this as having met up with fused plugs in the block.) Now I understand they are removed around 70,000 miles just to be sure that they can be.
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post #8 of 23 (permalink) Old 02-01-2007, 10:48 PM
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Warranted is a poor word, makes it sound like the plugs and engine area warrantied for 100K based on the plugs.

Emissions is warrantied for 8 years 80K, and only for certain components. Otherwise it is under the basic 3yr/36K warranty, unless it is covered under the 5/60 drivetrain warranty. California emissions states have emissions a little different. I am not so sure plugs would be covered under the extended emissions warranty.
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post #9 of 23 (permalink) Old 02-01-2007, 11:03 PM
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I believe the plugs in the Prius are Iridium. And I believe they have to remain so because they require a lower voltage. This is the same requirement for my 2003 Avalon. I read it in a manual somewhere although I'll be **** if I can remember where, but it was something Toyota wrote. I put the 4 prong Platinum plugs in my 1993 T100. They were the best thing to happen to the truck, made it start up with no grinding at all. I was so pleased I'm purchasing the dual prong (and 4 prong if I can get them) for my lawn equipment.[/i]

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post #10 of 23 (permalink) Old 02-01-2007, 11:41 PM
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Federal Emission Coverage: Components under the federal emission defect warranty are covered for 36 months/36,000 miles and specified major emission control components are covered for 8 years/80,000 miles. Specified major emission control components under emission performance warranty are also covered for 8 years/80,000 miles. In addition, emission performance warranty is applicable for 24 months/24,000 miles in states and local jurisdictions that require a periodic EPA-approved inspection and maintenance program.

California Emission Control Coverage: In California and any other state that adopts California emission warranty provisions, performance warranty and defect warranty coverage is applicable for 36 months/50,000 miles, and specific control devices are covered for 7 years/70,000 miles.


If plugs wear out or foul during the 50K miles then the car may fail emissions which would then require replacement by the manufacturer at their cost. Many states have adopted the Cali rules or have similar rules of their own. This applies to ALL cars, not just the Prius. Cali has had the 50K rule for at least 15 years.

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