Posted by jimg.allentown on July 22, 2017 at 18:48:03 from (173.49.133.204):
In Reply to: Spark Plug Analysis posted by Royse on July 22, 2017 at 12:21:27:
Well, in the great spark plug debate, I can offer some anecdotal evidence. Years ago, a friend of mine called upon me to rebuild his carburetor on his Datsun pickup. He said that he had just tuned it up, and it did not run right. So, I rebuilt the carb. When I put it back together, it did not run any better. I went over his work. I found nothing wrong. So, I asked him how it ran before he worked on it. He said it ran fine, and this was just for maintenance. So, we tried the old plugs back into it. Suddenly it ran good again. The new plugs he had put in were Champions. We got a new set of NGK plugs, and it lived happily ever after.
Next case. A customer brought a nearly new Mustang into the dealership I was working for. The complaint was that it ran poorly. Since the car was under warranty, it landed in my bay. So, I performed all of the requested diagnostics - including hooking it up to the SBDS system. Everything showed normal. No problems found. Yet, the engine did run noticeably rough at idle. Next, I took out a spark plug. It was a Champion. I asked about this, and was told that he had just had the car tuned up. I went to the parts department and got a new set of Motorcraft plugs and installed them. Engine ran smoothly. I demonstrated to the customer, and his comment was that it was now running properly and to his satisfaction. He asked me what I found. I handed him the Champion plugs and fold him what I had done. He became angry, insisted that I put the Champions back in, and was headed back to the garage that had done the tune up.
Over the years, I have had several times encountered similar situations. I found that Champions work perfectly in Chrysler products, but not as well in other makes. I also found that Autolite or Motorcraft plugs work best in Ford products. AC plugs for GM cars. Also, Champions work well in my 1954 Packard. Go figure...
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