Spark plugs for 4.0 V6
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greasefingers
New member
I am not aware of anyone doing this. From the Denso website the Iridium pn# for a 2003 v6 engine is IKH20.
Specs:
IKH20 14 mm thread, 26.5 mm thread length.
IK20 (for the v8 engine)
14 mm thread, 19 mm thread length
They both cost $ 12/ea from Denso. There is no mention of heat range.
Using iridium plugs on the v6, has been discussed here on this site but I do not think a conclusion was made.
Specs:
IKH20 14 mm thread, 26.5 mm thread length.
IK20 (for the v8 engine)
14 mm thread, 19 mm thread length
They both cost $ 12/ea from Denso. There is no mention of heat range.
Using iridium plugs on the v6, has been discussed here on this site but I do not think a conclusion was made.
Last edited:
Boaz
New member
Make sure you DOUBLE CHECK the gap on the plugs!! I put my new plugs in about 2000 miles ago. My gas milage has been terrible since I put them in. Last tank I got 14.5 Mpg calculated. I usually get around 18-20. I figured the drop in MPG was from the 265/70 Revo's and I hardly drive any highway miles now. When I was driving 32 miles one way all hwy miles I was getting great MPG.
SO today I pulled all of my plugs, and the gaps were WAY OFF!! Stupid me did not check the gaps when I installed them (could not find my gap tool) and like a dumb ass I took the toyota parts guys word for them being "pre gapped". The gap is supposed to be 0.43 inch and they varied from 0.29 inch to 0.33 inch. The plugs were black around the edges from I am assuming the engine not completely burning all the fuel. So lesson learned, check the gap.
SO today I pulled all of my plugs, and the gaps were WAY OFF!! Stupid me did not check the gaps when I installed them (could not find my gap tool) and like a dumb ass I took the toyota parts guys word for them being "pre gapped". The gap is supposed to be 0.43 inch and they varied from 0.29 inch to 0.33 inch. The plugs were black around the edges from I am assuming the engine not completely burning all the fuel. So lesson learned, check the gap.
Boaz
New member
oh BTW I replaced the plugs with the factory denso plugs. IMHO if the motor does not call for the iridium or platnium plugs don't buy them! I think the factory plugs cost 3.50 a piece. Replace them every 30k. Its a really easy install too. It took me about 20-30 minutes this morning to pull the plugs and regap them.. And I was talking to my neighbor and drinking coffee the whole time!!!
Good Luck.!
Good Luck.!
