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Post by marksommer on Jan 25, 2012 12:22:20 GMT -6
Has anyone with the 4.0 Northstar engine had any success with Iridium spark plugs, such as Denso or NGK? I am currently using the AC Delco #41-950. The reason I ask is that I used the Denso Iridium Power spark plugs in an '88 Cadillac with great results as far as gas mileage and throttle response. Thanks
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Post by wireless on Jan 25, 2012 13:28:41 GMT -6
I'm currently using some NGK Iridium's in mine with no problems. No better, no worse, except they were cheaper haha
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Post by sall on Jan 25, 2012 13:57:24 GMT -6
NGK definately makes some spark plugs for AC Delco. Which ones I don't know but if you look at the AC Delco plug and compare to NGK they are identical.
As a matter of fact, most anything that's AC Delco brand is made by the same manufacturers that make the majority of aftermarket replacement parts. Eg. - Gates makes their belts, and Raybestos makes their brakes.
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Post by Aurora40 on Jan 25, 2012 15:49:35 GMT -6
2nd gens come with Denso iridium spark plugs from the factory.
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bobsblue95
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Post by bobsblue95 on Jan 25, 2012 21:26:19 GMT -6
2nd gens come with Denso iridium spark plugs from the factory. They also don't use the waste-spark ignition setup. |
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Post by ntrenn on Jan 25, 2012 21:34:53 GMT -6
Pretty sure mine had the factory plug when I first changed them:
Denso PT16EPR-C13, GM part number 12561466, AC Delco 41-987.
First set went about 60,000
Second set went about 90,000
All said made in Japan on them...
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Post by Aurora40 on Jan 26, 2012 7:41:36 GMT -6
They also don't use the waste-spark ignition setup. That's true, I was going to mention that but I have no idea what gen the OP has. So I figured I'd just stick to the fact that GM had success with them in the 2nd gen. But it's a good point, if you have waste-spark, they may or may not be a good choice. Though I used NGK iridium plugs in my LT5, which also has waste spark, and never had any issues. But I also only put about 20k miles on them. |
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Post by marksommer on Jan 26, 2012 17:51:10 GMT -6
I went with the NGK Iridium IX since they were in stock locally and also cheaper than the Denso. I have a first gen Aurora, FYI.
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