Any recommendations on what type of spark plugs would be best for the 2006 H3?

 

The exact AC Delco replacements. The I5s do not like aftermarket wonder plugs and will eat them alive in short order.

 

Second that, had to change the cylinder 3 , and found the AC Delco at eBay. No issues since replacement

 

x3
Btw, there's a deal to be had right now on a 6pack (currently only 3 left) $32.29


$18.00 ($3x6) Rebate here: ACDelco Spark Plug Rebate

=1 paper weight, and 5 plugs for less than $3.00 each.

 

dammed that's a good deal

 

Several auto parts and several brands (AC-Delc0, NGK, Bosch, Autolite) with compatible part numbers and codes are actually longer than my plugs, as pulled out of 2006 H3. Therefore, the ignition coil won't sit and seal and I don't want to force it down and damage it. I tried all technologies, iridium, platinum, and the oldest fashion plugs I could find and all they sell are longer than the original plugs in my Hummer. Too old to read the number and specs on the plug, they are faded. Why can't I find this problem anywhere in any other forum I look ?
What are the originals Hummer H3 2006 spark plugs lengths ?

NONE of the aftermarket work. The ignition coil will not sit and seal (seat and seal). It does not work.
HELP !

 

3.7". Check your cops and make sure the boots are properly seated.

 

This FOUR YEAR OLD Thread you dug up has the answer you were looking for. LOOK at post #4. ACDelco 41-103

If they do not fit google how to change spark plugs. Boot on straight, pressed all the way down, then tighten Coil on Plug Pack bolt.