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Old 01-06-2017, 11:37 PM   #1
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Spark plug gap

I wanted to post this for anyone who has had problems with burning out coils and ignition modules on older 454 equipped coaches. This could also be true-for the 8.1's with coil packs as well. My brother has an older suburban ( pre vortec). He rebuilt the engine and put vortec heads on it as well as the recommended spark plugs with the recommended gap of 60 thousandths. He has burned up 2 stock coils, and a distributor module. The rig ran poorly (popped and missed) and was getting bad gas mileage. A simple re-gap of the plugs (35 thousandths) changed all of this and his rig runs like new with better gas mileage. We figured that the energy required to jump the plug gap at 60 thousandths was too much for the stock coil and resulted in its failure. Just thought you guys would be interested.
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Old 01-07-2017, 09:00 AM   #2
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8.1 Vortecs have individual coil packs (1 per cylinder), and no distributer. My 2004 model had .060 plug gap when purchased new. I replaced the plugs at 55k miles, New plugs are gapped at the now recommended .045. The stock distributor single coil type ignition on the 454 lacks having enough power for the later wider plug gap specs,as your brother found out. Back in the day, new plugs were grappled at .030-.032 on vehicles with this type ignition. Glad things worked out for him.
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Old 01-07-2017, 02:13 PM   #3
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8.1 Vortecs have individual coil packs (1 per cylinder), and no distributer. My 2004 model had .060 plug gap when purchased new. I replaced the plugs at 55k miles, New plugs are gapped at the now recommended .045.
I have gapped my AC Iridium Plugs to .045. It's also been recommended from other sources that a.045 gap works well on Platinum plugs as well.
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Old 01-07-2017, 02:41 PM   #4
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I am running reduced gap on my 8.1 as well. On the GM LS1 there was a bulletin put out by GM for reducing the gap as well.
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Old 01-07-2017, 06:23 PM   #5
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Autozone has the A/C 41-101 $6.99 plus $3.00 rebate

Just a heads up, anyone needing spark plugs.

Autozone has the A/C 41-101 for $6.99, download the rebate to take off $3.00 per plug, final cost is $4.00 a plug pretty good deal. Savings of $24.00

Rebate last until the end of 2017 maybe consider a sticky


Rebate form

http://contentinfo.autozone.com/znet...en_US/1709.pdf
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Old 01-07-2017, 07:54 PM   #6
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Just a heads up, anyone needing spark plugs.

Autozone has the A/C 41-101 for $6.99, download the rebate to take off $3.00 per plug, final cost is $4.00 a plug pretty good deal. Savings of $24.00
Did you guys see this on Amazon ??
AC Delco 41-101 Professional Iridium Spark Plug (Pack of 1)
by AC Delco - 4.7 out of 5 stars
Price: $5.40 & FREE Shipping on orders over $49. Details
Post-purchase rebate: $3.00 Rebate forms
Price after rebate: $2.40

OK - WHY are they giving these spark plugs away ??? These things last for ~100K miles and it's unlikely that a customer is going to turn around and buy them again any time soon.

BUT these are indeed the plugs that you want to buy.
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Old 01-07-2017, 08:33 PM   #7
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Quote:
Originally Posted by DriVer View Post
Did you guys see this on Amazon ??
AC Delco 41-101 Professional Iridium Spark Plug (Pack of 1)
by AC Delco - 4.7 out of 5 stars
Price: $5.40 & FREE Shipping on orders over $49. Details
Post-purchase rebate: $3.00 Rebate forms
Price after rebate: $2.40

OK - WHY are they giving these spark plugs away ??? These things last for ~100K miles and it's unlikely that a customer is going to turn around and buy them again any time soon.

BUT these are indeed the plugs that you want to buy.
I saw that too DriVer, but when you download that rebate form on Amazon, its for 2016, that's why I posted the AZ rebate. Might just be a matter of time if/when they offer the rebate for 2017
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Old 01-07-2017, 09:16 PM   #8
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Might just be a matter of time if/when they offer the rebate for 2017
That should work just fine.
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Old 01-07-2017, 09:34 PM   #9
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Now since I researched those spark plugs ... I've got spark plug ads popping up all over the place.
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Old 01-08-2017, 08:45 AM   #10
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I too gap my 8.1 plugs at 45 thousandths. I mainly put this out there for guys with older rigs with the HEI distributors. I did have my issues with a particular coil-on-plug primary wire frying on my 8.1 which I posted on here. As we all know, spark plug wire frying has been an issue for our rigs, but I'm wondering if the original plug gap of 60 thousandths I was running years ago contributed to the primary wire (which is like finding a needle in a haystack) heating, cracking and shorting out! This forum helped me through all that, especially Arch Hoagland, who suggested I get an Ultra gauge, so I thought I would put this out there for anyone having gone through the usual trouble shooting (replacing, plugs, wires, fuel filter, MAF sensor, crank position sensor, etc) and still can't figure out why they are missing, and back firing.
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