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good spark plugs? AC Delco Iridium spark plugs good spark plugs? AC Delco Iridium spark plugs
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Old 08-25-2007, 05:48 pm   #1
99 hrdtp
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CM good spark plugs? AC Delco Iridium spark plugs
are these plugs really good to use?? are these the original plugs that came with c5's?
the plugs I'm wondering about are-- AC Delco Iridium spark plugs
if these aren't the best to use then what is??

Thanks, Jim
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Old 08-25-2007, 08:51 pm   #2
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The latest PCM update is calibrated to be used with the 41-985 Iridiums.
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Old 08-26-2007, 02:57 pm   #3
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Factory plugs were Platinum, initially. I'm not sure when they switched to the Iridiums. Sometime around 2002-3 I would guess.

The Delcos are good. Many people like the NGK TR-55IX in the aftermarket.
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Old 08-26-2007, 05:10 pm   #4
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thanks guys. I guess Iridiums are better than Platinum?
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Old 08-27-2007, 07:36 am   #5
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HI there,
Yes, the Iridiums were engineered because they are less susceptible to erosion from fuel additives then platinum is.
TR55X carry a different electrode protrusion and should not be used. They change the spark propogation across the chamber.
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Old 08-28-2007, 03:26 pm   #6
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Quote:
Originally Posted by LLC5 View Post
The latest PCM update is calibrated to be used with the 41-985 Iridiums.
how do you find out if you have the PCM update??
Thanks, Jim
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Old 08-29-2007, 09:19 am   #7
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Quote:
Originally Posted by 99 hrdtp View Post
how do you find out if you have the PCM update??
Thanks, Jim

Have your local dealer (or any dealer) run your vin number. The print out will tell them if it has been done, along with all the latest recalls for your vehicle.
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Old 08-30-2007, 10:27 pm   #8
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This is the first I've heard of a PCM update for changing plugs. Could this be a possible cause of pinging too? I'm using the 41-985 plugs already. Does anyone know what the update has included within? '99 Coupe
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