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Username Post: Iridium vs platinum? 2007 - 6.0L        (Topic#362896)
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25274
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
10-13-20 06:02 AM - Post#2805363    

Did GM change the plug type after production? I've been asked to tune a 2007 1500HD. It was a surprise to see it labeled 1500 with 3/4 ton 8 lug wheels on it.
Did GM change the plug and gap size? I'm reading it should be 0.040 instead of 0.060. The owner mention he installed new A/C Delco plugs and they didn't work. He pulled them and installed a new set.
I plan on getting new wires after checking if it has round or square coils. It has evap codes too. So the single port valve behind the tank will be changed. So will the engine evap valve.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
Shepherd 
Frequent Contributor
Posts: 2173

Loc: Lake George, NY
Reg: 11-11-15
10-13-20 07:50 AM - Post#2805369    
    In response to gchemist

Pretty sure both plat and Iridium plugs are pre gapped, not sure if they changed recommendations, but Iridium seems to be the better plug.



 
elcamino 
Dedicated Member
Posts: 5471
elcamino
Loc: Lake Superior-Michigan US...
Reg: 03-30-00
10-14-20 07:28 PM - Post#2805477    
    In response to gchemist

1500HD would have to be the old body style referred to a "Classic". I looked in the AC Delco catalog and no Iridium plugs for that model are listed. Platinum is original equipment (OE)

Spark Plug
Part Number: 41-962
Product Notes:
Double Platinum Spark Plug
All; OE; GAP .040; All; Gap .040"

Per Vehicle: 8; Years: 2007-2007

------------------------- ----------------
Spark Plug
Part Number: 6
Product Notes:
Rapidfire Spark Plug
All; Gap 0.040in

Per Vehicle: 8; Years: 2007-2007

------------------------- -------------
Spark Plug
Part Number: R44LTSM
Product Notes:
Conventional Spark Plug
All; Gap .040; VIN: U, FI*

Per Vehicle: 8; Years: 2007-2007

Mike
2017 GMC Sierra Denali Ultimate 6.2L / 8-sp Z95
2017 John Deere X738 Snow Blower
2018 Polaris RZR S 900 EPS


 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25274
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
10-15-20 04:25 AM - Post#2805492    
    In response to elcamino

Thanks Mike!
The two choices are double platinum or rapid fire. It's a heavy use truck with a heavy equipment trailer. I better use double platinum. I fixed the A/C earlier this year on it. It had a bad low pressure switch. I replaced the orifice tube and cleaned the condenser. I was mad when I took off the high pressure hose. It leaked. After replacing it and charging it again, it blew ice cold. After a hot summer, it's still blowing cold. A new clutch fan keeps the motor and A/C cool.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
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