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Spark Plugs

37K views 122 replies 41 participants last post by  Matt D  
#1 ·
Hello i own a 2004 chevy colorado z71 crewcab....it has the 3.5...inline 5 cylinder. My truck is about to hit 100K miles and i was wondering wat are the best spark plugs to get and wat is the number on the spark plugs? thanks
 
#16 ·
X2

I had the Denso Ir plugs in my truck and they lasted 94k miles.

I swapped to Delco Ir plugs and regret it.

The truck idled and ran smoother with the old Denso Ir plugs compared to the new Delco Ir plugs. I'll be switching back to the Denso Ir plugs.
 
#3 ·
When I swap spark plugs im gonna put in those e3 or whatever they are called. I saw a program and they dyno tested them and they have 4% better gas milage and more power then the other after market ones they tested.
 
#11 ·
bosch iridium +4. you'll notice your 04 run much smoother with them. 2006+ got iridiums from the factory i believe so i'd recommend all 04-05 guys do the switch.
 
#13 ·
had em in since i wanna say late 06 early 07....had no issues and love em. truck idles 100x smoother.
 
#29 ·
#22 ·
i searched all over for the e3 plug info and have found nothing on this site for it. Everything ive found through google and tv said they were awesome.
 
#27 ·
Well , Carmax60 came by 2 weeks ago with an 04 that ran fair. Hes got a K&N CAI and flowmaster exhaust. Truck has right at 100K but ran fair...We changed out his plugs with bosch iridium and it made a hella difference.. Ran quiter, better mpg and much more responsive....DOnt know if they last but it certainly made a believer outta me.
 
#30 ·
i've put about 30k on them so far and they still seem to run as smooth as the first day i installed them. not that i'd noticed any slight difference anyways but yeah no problems with them so far.
 
#32 ·
So I just reviewed this thread as I was looking for the best spark plug for a 2004 Canyon. It seems that Denso iridium plugs last and give the best performance. I've read a lil on the Bosch ir plugs and have determined that they just don't last as long and my cause probs.
I have only just hit the 50,000 mile mark on my 2004 and the stock plugs are fine. I'm looking for any additional input on the subject of performance and plugs.
 
#33 ·
Yep, I have the Denso's in for 40k so far with no issues!
 
#34 ·
someone had put the E3 plug in my truck before i bought it and had to tak it into the dealer for a rough idle and the fixed it with 4 new plugs and 4 new coil packs because the E3 plugs have a higher resistance and since this happend they did not cover it under warrenty! E3=Piece of Shit
 
#36 ·
The Densos have a groove cut into the ground electrode; promotes better combustion.
Out trucks are coil on plug, no plug wires.