Brenden Burnham

Do you happen to know the deal on the spark plug wires? Sites show that the Bosch Platinum Spark Plug 6704 are suppose to fit but side by side with my old ones they were about a half inch too short. I have a GMC Sierra 1500 4x4 4.8l.

Hopefully not but only time will tell.

Yes and the old plugs were .060 and the new ones pre-gapped to .040(Sorry left out a 0 in previous post).

And I ended up going with the Bosch Platinum Spark Plug 6704 which are pre-gapped. They are pre-gapped to .040 in case any are wondering.

It is funny that you showed a pic if that plug as I ran into the same thing just now after replacing number 6 it had broke, luckily was still able to remove. Crisis adverted. Am glad I replaced the plugs the old ones were pretty bad and they were iridium and gapped at .060. As you may be aware the bulletin came out later that they had changed it to be .040 gap. What sucks is the wires I got even though showed was suppose to fit my GMC they were about .5 inches too short. "ACDelco Wireset 9748GG" Those showing suppose to be able to fit but nope. Anyway reused the old ones as after inspection all seem good and well they are also ACDelco wires. Idle does seem smoother with the new plugs am sure the old plugs and also the .6 gap had to do with the not as smooth idle.

Very well said. My truck does have a LOT of miles(270,000) and not knowing exactly was done prior I am a little on the cautious side so really if I am doing something I think my thinking is right go the extra mile assuming it wasnt done at least in a VERY long time. I am very keen on keeping up with the fluids, oil change, etc on a vehicle especially one that has a lot of miles. Recently had to replace bad idler pulley(bearings locked up)(causing damaged belt), and the recent EGR Valve that had gone bad. The truck drives very good.

Not sure purchased the truck(2000 Sierra 1500) about 6 months ago. The one plug that went bad after looking at the tip had broke and was for sure corroded so figure is a good idea to do all and due to the bad condition of the bad plug assume has not been done for a VERY long time.

I track my miles using the app "Gridwise". Just make sure is on"tracking" as soon as you turn on the vehicle and is accurate. Should help.

Thanks and yeah I agree.

I had one spark plug go bad and just replaced the one. All is good but plan on changing the other 7 spark plugs. Right now runs very good nice clean idle but do you feel I should change all the wires while I am at it? I am sure most will say yes but is there a good reason to do so? Do you all notice the wires failing at all?

Took about 10 minutes to install(most time came from finding my ratchet extension). Checked and the passages were completely clear/clean. Swapped out. Kept old just in case was bad wire/connector somewhere. Not even 30 minutes of driving the check engine light turned off. Happy

Sounds great. Going to swap out EGR tomorrow and will update.

Took in to get check engine light code and came back the EGR Valve(0401). My question is it typically for these trucks is it usually just a bad EGR Valve or is it often something else maybe the connector, etc? Is just a 10 minute job(if that) to replace so of course is going to be the first thing I will do but if that is not what else should I check? Seen videos of them testing using a pressure tube but these do not seem to be like the old style EGR's where it had the port on top to test with. Also seen some things about testing the DPFE Sensor, is that the thing that plugs into the EGR valve itself or is it located somewhere else?? Couldnt really find anything on the location of the DPFE Sensor. So first I am going to replace EGR Valve. If that doesnt solve it what should I test/check next? Thanks everyone