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Denso plugs original?

tex50

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tex50 Enthusiast

tex50

Posted
Posted

2000 Silverado, 1500, 5.3, 100k. Just bought from original owner. Everything was well maintained. Pulled plug see if they had been changed and found Denso PTJ16R15 plugs gapped at .60. Are these original? Is this even the right application for this plug? Googled, doesn't seem to be. Also had Packard plug wires, stamped on the coil pack end with Delphi 113. Plugs look clean buy not newer. Help appreciated.

txab Senior Enthusiast

txab

Posted
Posted

AC Delco or NGK would OEM. The reason why that Denso # doesn't show for your truck is that GM has changed the plug gap to .040 now. Replacement plug is AC Delco # 41-110

tex50 Enthusiast

tex50

Posted
  • Author
Posted

AC Delco or NGK would OEM. The reason why that Denso # doesn't show for your truck is that GM has changed the plug gap to .040 now. Replacement plug is AC Delco # 41-110

 

Thanks. Read somewhere to check the numbers on the coil packs to make sure you have the right plugs.. Can't find any numbers on packs and this seems to be the plug recommended everywhere. Do I need to confirm this or is that definitely the right plug. Any comments on the wires. Thinking of just using the ac delco not trying to find this Packard set. Thanks again.
txab Senior Enthusiast

txab

Posted
Posted

41-110 is the plug. .040 gap

 

The only thing I've ever seen needing the coil numbers is for the wire sets. One set is about 1/2" longer than the other

Z45 Senior Enthusiast

Z45

Posted
Posted

Denso is used by GM so they could be original. I havde seen Denso plugs inside of ACDELCO boxes. Packard and Delphi are GM spin off companies from years gone by.

 

General Motors - United Motors Service

 

United Motors was originally independent of General Motors, selling to all manufacturers until 1918, when the company was acquired by General Motors for $45 million (three quarters debentures and one quarter common shares) and integrated into GM on December 31, 1918.

 

United Motors became United Motors Service and continued to operate essentially as it had before. However, all of its production was now devoted to GM's brands. Alfred P. Sloan continued as the division manager, which carried with it a GM vice-president title and a position on the GM board. In 1923 he became President of General Motors and was Chairman when he retired in 1956. Charles Kettering, co-founder of Delco, was head of research at General Motors for 27 years. Herbert C. Harrison was President of Harrison Radiator until his death in 1927. William C. Durant lost control of GM for the final time in 1920.

 

United Motors Service would become a fully integrated division of General Motors in 1944.

 

United Delco

 

In 1971, the divisions name was changed to United Delco. With the Delco name becoming more well-known with consumers, the Delco name was incorporated into all of the divisions branches (Delco Remy, Delco Harrison, Delco Packard (Packard Electric), Delco Moraine).

 

AC Spark Plug Division

 

In 1899 Albert Champion, a champion bicyclist, formed the Champion Ignition Co. By 1905, Albert Champion had lost control of his company and in 1908 he partnered with William C. Durant of the Buick Motor Co. to form the AC Spark Plug Division of General Motors.

 

AC-Delco

 

In 1974, in an effort to streamline its operations and marketing, General Motors merged the AC Spark Plug with United Delco, which for years had been selling to the same customers, to create the new AC-Delco.

 

ACDelco

 

By the mid 1990's there were further changes to the division. In 1994, Delco-Remy, part of the division since 1916, was spun off to private investors and is now known as Remy International, Inc. Also in 1994, GM created Automotive Components Group to run Delco Electronics. ACG was later renamed Delphi and spun off from GM in 1999. 1995 saw a rebranding of AC-Delco. The hyphen was dropped and ACDelco received a new logo and marketing initiative.

tex50 Enthusiast

tex50

Posted
  • Author
Posted

41-110 is the plug. .040 gap

 

The only thing I've ever seen needing the coil numbers is for the wire sets. One set is about 1/2" longer than the other

 

 

Can't seem to find numbers on coil pack that make sense. 9603 stamped on side. Only numbers I can find and that sequence is way short of the numbers listed for the potential wires. Where exactly are the numbers stamped? Thanks.

 

Denso is used by GM so they could be original. I havde seen Denso plugs inside of ACDELCO boxes. Packard and Delphi are GM spin off companies from years gone by.

 

General Motors - United Motors Service

 

United Motors was originally independent of General Motors, selling to all manufacturers until 1918, when the company was acquired by General Motors for $45 million (three quarters debentures and one quarter common shares) and integrated into GM on December 31, 1918.

 

United Motors became United Motors Service and continued to operate essentially as it had before. However, all of its production was now devoted to GM's brands. Alfred P. Sloan continued as the division manager, which carried with it a GM vice-president title and a position on the GM board. In 1923 he became President of General Motors and was Chairman when he retired in 1956. Charles Kettering, co-founder of Delco, was head of research at General Motors for 27 years. Herbert C. Harrison was President of Harrison Radiator until his death in 1927. William C. Durant lost control of GM for the final time in 1920.

 

United Motors Service would become a fully integrated division of General Motors in 1944.

 

United Delco

 

In 1971, the divisions name was changed to United Delco. With the Delco name becoming more well-known with consumers, the Delco name was incorporated into all of the divisions branches (Delco Remy, Delco Harrison, Delco Packard (Packard Electric), Delco Moraine).

 

AC Spark Plug Division

 

In 1899 Albert Champion, a champion bicyclist, formed the Champion Ignition Co. By 1905, Albert Champion had lost control of his company and in 1908 he partnered with William C. Durant of the Buick Motor Co. to form the AC Spark Plug Division of General Motors.

 

AC-Delco

 

In 1974, in an effort to streamline its operations and marketing, General Motors merged the AC Spark Plug with United Delco, which for years had been selling to the same customers, to create the new AC-Delco.

 

ACDelco

 

By the mid 1990's there were further changes to the division. In 1994, Delco-Remy, part of the division since 1916, was spun off to private investors and is now known as Remy International, Inc. Also in 1994, GM created Automotive Components Group to run Delco Electronics. ACG was later renamed Delphi and spun off from GM in 1999. 1995 saw a rebranding of AC-Delco. The hyphen was dropped and ACDelco received a new logo and marketing initiative.

 

Wow!
vernons9358 Enthusiast

vernons9358

Posted
Posted

when gm first went to iridium plugs... they were made by ngk.. when i bought my 01 silverado 6yrs ago.. when i pulled out original plugs.. they were labeled ac-delco by ngk.. getting ready to put new wires and 41-110 plugs in again.. just hit 152,000 miles!! and still running like new..

tex50 Enthusiast

tex50

Posted
  • Author
Posted

41-110 is the plug. .040 gap

 

The only thing I've ever seen needing the coil numbers is for the wire sets. One set is about 1/2" longer than the other

 

That seems right. The only numbers on coil pack are 4 digit stamped. So if I match length that should be right? Looks like all other specs are the same. Even the stealership wasnt sure. Couldnt figure it out by vin...
bossier62guy Senior Enthusiast

bossier62guy

Posted
Posted

My 02 came from the factory with those same Denso plugs as well...been running NGK TR5 standard plugs in it for years. I just change them more often now.

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