03 Suburban - Spark Plug Change - Anything I Should Be Prepared For?

Messages
643
Location
Florida
I am getting ready to do a spark plug change next week on my 03 Suburban 1500 5.3L I have had the vehicle since 66k miles. It now has about 130k miles. I have no clue when or if the plugs have ever been changed. Are there any known problems with removing these plugs that I should be prepared for and any tips or tricks to help make this go smoothly? I know the older Expeditions had issues in some of the years with plugs breaking and the head threads stripping, I just want to be prepared if there are any known problems on the Suburban.
 
When you are ready to turn the plug, I recommend a 1/2 inch ratchet crossed over to your 3/8 inch drive spark plug socket. It's going to take a goodly amount of torque. Don't be surprised if it's makes a bit of a squeal. smile
 
Messages
2,560
Location
wv
I have a 2003 suburban with a 5.3 and have changed the plugs. I used AC-Delco 41-962 per bulletin https://images.oreillyauto.com/parts/img/documents/acd/41-110.pdf gap at .40 A few of my wires broke during replacement so plan on wires as well. I used Delco wires. The back plug on the passenger side is the toughest. I used a couple wobbles and a couple of extensions. FYI while you are in there... do u ever feel a slight clunk in the steering? If so remove the bolt in the steering shaft and push and pull the shaft towards the firewall and towards the front a few times. It lubricates the joint with grease that gets dry over time.. I also did both of my front 02 sensors while i was at it.. and kept them as spares in case the back ones act up.
 

Fitz98

Thread starter
Messages
643
Location
Florida
Rock Auto has 2 sets of AC Delco wires that fit my coils stamped 12558693. The standard replacements are about $14.00 more than the professional replacements. 748HH Under standard OE Replacement 748HH And 9748HH Under Premium 9748HH Money is not an issue. Which would be the better set to get? Any idea what would be the difference between the 2 sets?
 
Messages
10,984
Location
USA
The 748HH set is the actual OE wires, so if that matters to you, get those wires smile The 9748HH will most likely be generic aftermarket wires reboxed. I mention this because if you want Delco, you are probably seeking OEM My choice is always OEM or NGK wires
 
Messages
305
Location
Kern Co. California
Like all others have said, fairly easy, but do the wires too. Use factory wires or NGK.. I would also use factory plugs/ AC delco plugs. I have had a few of these style trucks with that engine and have not ever had any issue going that route.
 
IIRC, the spark plugs on the driver's side tilt to the front.The spark plugs on the passenger tilt to the back and are more work. You can do them either using the flying superman stance, ( lying on your belly across the engine bay) , or you can remove the front passenger wheel, block the vehicle and come in through the wheel well. ( it's what I did). Good luck. smile
 
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