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Discussion Starter #1
Vehicle doesn't make any difference, daughter's vehicle was getting a misfire when she hit the gas. Removed four NGK spark plugs, clean, gap was okay, but a rim of some gummy substance at the base of the ceramic where in mates with the metal.

Put them in my spark plug tester, find spark with low pressure, but when I increased the pressure to 150 psi, could not only feel air coming out of that poor seal, but also blew out the spark.

With the vast proliferation of spark plug types, out of eight places in town, not one had her type, so had to order these off the net. For now, cleaned off that gum and used a high temperature glue to help retard those leaks, and told her to be easy on the gas.

Japan is even worse than the US with their corporations buy crap from 3rd world countries, workers in Japan are paying the price like we are. NGK plugs were good at one time, but add this to your history book.
 

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2014 Cruze Diesel, 2007 Cobalt, 1981 Camaro Z28, 2017 Volt
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I've never had any issue with the NGK Iridiums I run in my Cobalt - one step colder than factory. Been in there for...60k miles now?
 

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Many NGK Plugs are made in the USA. They take quality pretty seriously, at least they did when I worked there in the 90s.
 

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Discussion Starter #5
Are the OEM's buying counterfeits? Same problem with the NGK's that came with my Cruze, but at least I didn't get one with a leaking heater core or water pump. These came with her Kia Soul, apparently that glue is holding, said she never had the kind of power she has now with the little 1.6L in a 4,000 pound vehicle.

If you get into deep trouble here telling it like what you experienced, then you are in deep trouble.

Ha, at a family reunion last weekend got to talking about car problems, everyone had to buy new tires at 40K miles, even my rich relatives buying a Lexus or a BMW. Are these also counterfeit?
 

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Nick D, the search for the best Plug for the Cruze is OVER...Get the Denso IK22's....Best power over all the other Ngk's for the cruze....
 

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Ha, at a family reunion last weekend got to talking about car problems, everyone had to buy new tires at 40K miles, even my rich relatives buying a Lexus or a BMW. Are these also counterfeit?
I'm surprised they got that many miles on the OEM tires for a "luxury" car.
 

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Discussion Starter #12
Since there seems to be an element of distrust, should have stopped, cleaned my hands and taken a photo of these plugs. First sign was an orange brown coating at the base of the metal on the ceramic where it attaches about 3/16" high. Rest of the ceramic was a nice clean white.

Combustion chamber deposits, only one way to get up there, poor seal between the metal base and the ceramic. Not just on one plug, but all four. The metal base where it contacts the engine head was cleaned, plugs were properly torqued. Under light engine loads, vehicle ran okay, but sure lost power when you hit the gas.

These were iridium plugs, but only on the center electrode, ground electrode was bare. Not a real expensive cure, ordered Autolite double iridium plugs off the internet XP6203's for 15 bucks. She got on the internet, lots of people were complaining about this same low power with the same problem. Solutions was to trade it off for a 2.0 or 2.4L engine and this is what she was talking about. Ha, said honey you will be taking a huge beating on a trade in. Well she has that power now.

Same problem I had when I first received my Cruze, with a manual transmission, had to rev the engine before releasing the clutch or will kill the engine, with good spark plugs, could even take off in third gear without killing the engine and was enjoying 46 mpg with the cruise set at 65 mph.

If you find this information useful, use it, if not, disregard it.
 
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