Counterfeit Toyota spark plugs effects on car.

Hope you had a chance to write up a scathing review for the seller.

 

yes tell us who the ebay seller was so we can avoid them! Also ebay will refund your money if you complain...

 

Peter does a good job of explaining why "will fit" is likely more accurately will NOT fit.

 

How many miles did you put on the counterfeit plugs?

 

how much were the oreily plugs?

 

I love the way the "iridium" fine wire center electrode is gone and is now a 'rounded off nub'.

 

That spark plug in the first pic has a carbon track down the side of the insulator. The thing is that it will usually also burn that track down the inside of the coil boot as well. Replace just the coil and the problem spark plug is still there, and it might damage the boot on the new coil. Or possibly not if it was only a short time before replacing the plugs. Just something to be aware of.

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That's what comes of substituting froyo for the iridium.

 

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In the last five(5) years I'v swapped out over 100 sets of plugs in all different makes and models. Every time, the plugs came from RockAuto. Not any problems ever.

RockAuto
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That burnt brown stuff on the original Denso plugs on the porcelain is oil in the spark plug well. Valve cover gasket is leaking oil filling up the spark plug well. That alone can sometimes cause misfires.
Very common. Found mine was leaking at 110,000 miles. There's no hardened seal there on the gasket
at that plug well hole like other 4 banger sometimes have. There's no bolts bolting down that gasket area in the middle there just bolts around the edge of the cover. Gaskety shrinks cover gets slightly loose and will weep at that area.

Probably the ends of the cop boots are shot now too from oil damge. Take a cop boot off and pull on it its edge end see how cracked the boot is.

This car probably has 200,000+_ miles on it.

And if you think counterfeit plugs are bad your going to love 4 cops on amazon for $40 lol...

Stock cop is $85 each last I looked. Wouldn't waste my time on anything else. Unless you love going back in again and again.

I changed my plugs 4 Denso Irid's bought online from Toyota and 4 new oem cops at 110,000 miles drove away 40,000 miles later car running perfectly.

 

With minimal overhead, Rock Auto has the Denso and Hitachi COPs for about $50 each if anyone is in need.....
As always, they also have other brands available for significantly cheaper between $13 and $50. Typically you get what you pay for and don't get what you don't pay for....but every situation is different.

If just the boots are messed up, they have them available for less than 5 bucks each.

 

A1Auto, Rockauto, or any local stores are great. If we buy online, always check if the seller well established on selling parts or actual Toyota dealership with address and phone number.

We can measure the resistance on each plugs. They should be in kOhm range and the difference is less than 30% from one to another. Fake plugs are often 100% or more differences.