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08-13-2012, 02:33 PM #1
- Join Date
- Jul 2009
100,000 mile tune up and maintenance questions - Spark plugs, fluids, others ideas...
I'm just about to hit 100,000 miles in my '99 and am wanting to do some maintenance and replacement of a few parts.
1) what are the pro's and con's of the expensive spark plugs and wires? Is it worth the $10 each for high end one, or are stock Delco ones just as good?
2) I keep hearing good and bad things about synthetic differential and transfer case fluids on older vehicles, such as mine. What is your input and thoughts on the topic?
3) I generally keep pretty up to date with maintenance, so nothing on the truck is broken or at the limit of its lifespan, but what else should one change out at the 100,000 mile marker?
I am welcome to any input or suggestions. Thank in advance everyone!1999 K1500 Ext Cab, Short Box
5.7L 350, K&N CAI
Mangnaflow Cat-back True Duals
Tuff Country 2.5" Lift w/AAL's
VVME 35w 4300K HID's (Low)
08-13-2012, 04:36 PM #2
My 2 cents:
1. The ACDelco plugs appear to make most GM engines VERY happy.
2. The synthetics are the way to go.
3. I like to change the front O2 sensors when I change plugs.
Have you considered the transmission fluid?Ray
'09 Avalanche LTZ - Black
'05 Envoy XL (sold)
08-13-2012, 08:45 PM #3
I just did this tune up on my 04 5.3 liter. I changed the following
-all o2 sensors
-auto light xp iridium plugs (.040 gap)
-0-40 mobile one oil change (recommended by a GM wizard)
-all rotors and pads all around
My truck ran great anyways, no issues but it ran AMAZING after these tuneup items were replaced. It got much quieter and my fuel economy did improve!
08-14-2012, 08:52 AM #4
1995 Silverado 4x4
6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge
2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
2002 Silverado ext cab 2wd (Sold)
2003 Yukon XL (Totaled)
08-14-2012, 11:40 AM #5
Iridium plug technology is widely misunderstood. Iridium plugs are not designed to give you motor better performance, they are designed with the metal iridium (obviously) which is much much stronger then platinum. Iridium plugs were designed to be a long lasting, durable plug that can with stand the harsh motor environment better then any other type of plug
A GM tech that says iridium plugs have a differing resistance that the motor was designed for is a MORON! Lol sorry, plugs do not dictate your resistant in the sparking system, your plug wires work with your coils to determine resistance, the plugs are just a catalyst for this outcome.
08-14-2012, 03:44 PM #6
Copper (more properly, Copper/Nickel alloy) has the least resistance, but also burns away the fastest.
Platium is about twice as resistant as copper, but the hardness of Platinum makes it far more durable. (80-100K miles are now common)
Iridium is far more durable than platinum, but also blasted expensive. The resistance of pure iridium is very close to Copper/Nickel alloy, but pure Iridium oxidizes too easily. As a result, the Iridium is used in an alloy without a "standard" across the manufacturers (or even plug lines of the same manufacturer). The result currently is that performance varies, and you may have a design that doesn't work well in your vehicle.
The smaller post on the iridium plug also is reported to help squelching.
But here's the thing...
Regardless of the metal type used, as long as you can create an arc, you create an arc... Over the life of the plug, the greater the gap, the more voltage is required. As long as you can bridge that gap consistently, and the spark ignites the fuel, you're looking at combustion. Iridium seems nice for the longevity, but if you're not getting misfires with platinum, you'll not gain anything with iridium.
The bottom line is that YES... Resistance is a factor and different metals, manufactured alloys, and plug designs all impact the effectiveness of combustion and durability. There's no such thing as a perfect plug for every application.
Last edited by Skippy; 08-14-2012 at 09:14 PM. Reason: Adding linkk to metal resistance, melting points, and hardness.2006 Vortec Max 1500
-Custom Tune (389HP 440 Ft/lbs Trq - Dyno'd) | Volant CAI | Magnaflow Dual-in/out Exhaust w/3" stainless pipe tips | Fully Built Transmission w/ Red Eagle Clutches & Kolene Steels w/ Corvette Servos and Stage2 Shift Kit | 35K Tranny Cooler | Mobil 1 | Royal Purple Rear Diff
-Spray-in Bed Liner
-Premium Sound w/lifetime Satellite Radio | Leather | Sunroof | Heated Seats
-Limbstriping from USING the truck (those are badges of honor)
08-15-2012, 09:19 AM #7
- Join Date
- Aug 2012
I am the tech manager at Autolite. XP Iridium plugs for your truck are 6.99 and very comparable to the plugs coming out. AC Delco plugs are all made by Autolite or NGK these days. The plugs that lasted are expensive plugs, copper core plugs will have you changing again in 30k miles. You can learn all about spark plug metalurgy here-
Using synthetic oils and gear lubes will only make your truck last longer, dont forget about the filters!
10-05-2013, 05:13 PM #8
Curious about o2 sensor's replacement. Could you explain what they do and how they affect the vehicle.
10-05-2013, 05:18 PM #9
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- Dec 2011
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1996 Chevy Tahoe LT 5.7L V8 4X4 205,000+ miles. Built proudly at Janesville Assembly in Janesville, Wisconsin
Basic mods: Lights all over, bunch of electrical work, and a couple cooling mods.
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10-05-2013, 05:29 PM #10
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