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Which Spark Plug Wires?

animlmed

By animlmed
in Ask A GM Technician

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animlmed Enthusiast

animlmed

Posted
Posted

I replaced my spark plugs about 10,000 miles ago with AC Delco Iridium, but I figured replacing the wires couldn't hurt (even though nothing was knowingly wrong with the current wires at the current 125,000 miles). I ordered the wires based on the specific coil (Melco)I have on my 2005 1500 Sierra Z71 5.3L . I replaced my original wires with AC Delco 9748HH wires (http://www.amazon.co...e/dp/B000S2QVYE).

 

Here are my questions:

 

1. Are these the correct wires? The Delco site lists these and another set of wires without a 9 in front of the product number (9748HH versus 748HH). The only difference I can tell is that the 9 indicates they are the "Pro" series.

 

2. Is there a specific order they should be used? I noticed that on both the boot end and the coil end they are stamped with different "Kw" numbers. I assume these reference a specific resistance, but I am not sure.

 

I ask because I installed the wires on my truck without obvious issue and everything seemed to be working correctly; however, my gas mileage decreased after installing (17 to 18 on the highway down to 14 or 15). Over the weekend I put the original wires back on the the truck and the gas mileage has gone back up. I only had the new wires on for approximately a week, so my observation time was small. However, I went through two different tanks of gas with the same low mileage results.

 

Any help you may be able to offer or help pointing out any obvious flaw would be most appreciated.

 

Thank you!!!

 

 

Alex

  • 4 weeks later...
88m53453 Enthusiast

88m53453

Posted
Posted

i will say that I replaced my plugs and wires just as you did on my 05 Sierra this past summer/fall. I didn't check my mileage immediately prior or immediately after, but I did get 24 easily as recently 6 months before the tune up. I did the tune up and checked mileage just recently...I lost 10% mpg easily, maybe more. Wish I had kept the old wire set to try them back. FWIW, I got my wires from amazon as well and they were Delco as well

  • 1 month later...
animlmed Enthusiast

animlmed

Posted
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Posted

Hmm that's interesting that they are both from Amazon. I thought about buying another pair from Discount auto parts or something to see if I had the same results. I still have the box for mine so perhaps I will see if Amazon will take them back. Of course, there is no guarantee that the other plugs will act any differently.

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