I installed the Denso Iridium IK22's a couple of weekends ago, and i love them! They are 1 heat range colder than stock, i changed them out at 30k... The stock plugs were definitely gone, installation took 1hr. After i changed them out, the car ran tremendously smoother, and the car seemed more responsive all together.
The plugs that came with our cars from the factory were the Bosch FR8LDC.
I swapped plugs last night and so far no more battery light. I am now on the correct bosch supers While I was getting the flashing battery light I was running bosch supers 2 ranges colder.
After I replaced mk Denso Iridium IK22's with the bosch coppers the problem disappeared. It looked as if the electorodes on 2 of the Denso's were oddly eroded and were probably causing a misfire.
My 99 NB 2.0 came with those 3-prong NGK's. Worked fine for the recommended 40k miles
I have had exellent results and will probably run nothing but them
i just changed mine out.. i put in the autolite 3923's ($4 for the set) . they seem to work fine. one thing to watch out for though - they were all gapped differently out of the package. be sure to measure the gap before putting them in, just in case. (the gap should be .028)
Go with a normal plug (I run NGK) and stock wires. Oh, a lot of the hype about the Plat-4 is just that...hype. The spark is going to follow the path of least resistance. Meaning, its only going to go to one electrode at a time. Well, maybe if your engine fouls plugs, but otherwise, just get a set of OE Replacement NGK's.
i'm running autolites right now and i'm not too impressed with them
Put them into a stock '87 Subarban and tore my hair out thinking I messed up the wires 'cause it idled so bad. Really, like I had two wires switched. Put the old worn regular AC's that I just took out and it idled perfect.
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