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Re: 2004 GMC Sierra Crew cab 1st tune up
New spark plugs, new plug wires, new fuel filter, flush and refill radiator and new tranny fluid and filter, have tires rotated, chassis lubed, and have power steering fluid checked to see if it needs to be flushed and refilled.
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Cars don't require a tune up like they did 20 yrs ago. There is a list of recommended service items found in the owners manual for mileage intervals.
At 100k I would say the filters and spark plugs should be replaced, along with the trans fluid and several things inspected. Prices would vary depending on where you live, so check with some local shops.
what engine? The fuel filter is in the fuel tank, Spark plugs should be replaced, throttle body cleaned, and the truck generally checked over, battery , belts, brakes, tires ect. Spark plugs, trans fluid, filter, transfer case fluid change, are all due at 100k. You should have the 100K service done. Of course they base that on if you have been following the service schedule. Your owners manual will list all things that are due.
New spark plugs, oil and oil filter, transmission flush and fill, fuel filter, air filter, coolant flush and fill, clean throttle body plate and bore, clean the MAF sensor, replace any loose or cracked vacuum lines, PCV valve, new air filter, new battery.
99% of the time all you should ever need for a tune up is new spark plugs, and a clean air filter and throttle body. But since your inquiry indicated "major" I gave it more critical thought.
Your best longevity check is to set up and maintain a consistent oil and filter replacement schedule...Depending on your planned driving habits...your owners manual should recommend you change these every 5000-7500 miles or every 3 months whichever occurs first. Oil products have inproved for many years. The synthetic oil blends are the best for performance and mileage...most exceed your Cadillac specs...Mobil 1, and Castrol full synthetic are by preferences...No special tune-up or other maintenance should be needed at this time...watch for serpentine belt...100,000 miles...plugs and plug wires...100,000 miles...suspension parts vary between 75K to 100K before replacement...Hope this helps.
With the advent of platinum tipped spark plugs and distributorless ignition a tune-up doesn't consist of much. Air filters (engine and cabin if equipped) should be replaced at 30k mile intervals (more frequent if in dusty climates). Spark plugs and PCV valve should be replaced at 100k mile intervals. The fuel filter is built inside the tank and is designed to last the life of the vehicle.
So basically if your at 100k miles you should replace the air filters, pcv valve, spark plugs and wires(if equipped). That is the extent of a "tune-up" now a days.
oil and filter change
coolant ,due at 100k miles
spark plugs ,due at 100k miles
trans fluid and filter change
engine air filter
check all belts
check tires and brakes
check alignment....that should be about it really
While you should regularly change filters (air, fuel, cabin) a "tune up" should be done at 100k. Today a tune up only consist of replacing spark plugs, wires (if applicable), PCV valve and filters. Replace the plugs and wires with OEM parts. The price difference is marginal and it's not worth chancing it with aftermarket parts. I've seen some driveability issues caused by non oem plugs and it's not fun doing a job twice.