spark Plug preference
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Recovery Vehicle
Joined: Jun 2014
Posts: 1,022
Likes: 194
From: Central NJ
Put in the Autolite Iridium, seems to run better, smoother. Good news is no oil or steam cleaning in the cylinders. Old ones were not particularly worn/dirty/bad, but I know they are atleast a few years old. Tip for the future, it is probably worth removing the SAI pump to gain better access to the passenger side.
Thanks for the tips.
Thanks for the tips.
Thread Starter
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Recovery Vehicle
Joined: Jun 2014
Posts: 1,022
Likes: 194
From: Central NJ
Plugs
The ones Chris suggested.
Autolite Iridium. Gap them to .035 - XP3924 4000 Ohm resistance.
They come gapped at .044, just need to regap them.
Now I need to get the O2 sensor out. broke three 1/2" extensions. I need them to get past the exhaust pipe to get the O2 wrench on it. I am thinking about cutting the wire and putting a 22mm box wrench on it. that becomes a point a of now return, mostly runs fine now. Just an occasional stumble. I have been hitting it a couple times a day w penetrant and driving it to heat it up. On the other hand might just be easier to cut out the section and put a new section w the bung in.
Autolite Iridium. Gap them to .035 - XP3924 4000 Ohm resistance.
They come gapped at .044, just need to regap them.
Now I need to get the O2 sensor out. broke three 1/2" extensions. I need them to get past the exhaust pipe to get the O2 wrench on it. I am thinking about cutting the wire and putting a 22mm box wrench on it. that becomes a point a of now return, mostly runs fine now. Just an occasional stumble. I have been hitting it a couple times a day w penetrant and driving it to heat it up. On the other hand might just be easier to cut out the section and put a new section w the bung in.
Camel Trophy
Joined: Aug 2014
Posts: 4,743
Likes: 985
From: Southwestern Virginia
I wouldn't go through that much trouble if it's running fine. When the time comes, do like you said and cut the wires (or the body of the sensor with a sawzall) and get a socket on there. Wouldn't cut the pipe. Would sooner just drill another hole and weld a new bung in, but if it isn't throwing a code or obviously malfunctioning based on live readings thru a scanner, I wouldn't fool with it.
1st Gear
Joined: Mar 2023
Posts: 1
Likes: 0
From: NorCal
The most important consideration for spark plugs is that they are double-platinum, or double some other precious metal (often iridium).
The reason is that the DII uses a wasted spark ignition system. Google it. Conventional copper plugs wear out quickly if used in a wasted spark system.
Before I started taking care of my truck myself, a local shop installed conventional copper plugs. They lasted just 13,000 miles before the misfires appeared. I replaced them with the OEM Champion 7070s (RC11 PYP B4). They are double-platinum, and were still going strong 72,000 miles later when I replaced them proactively only because I was replacing the wires.
There is a lot of snake oil marketing with spark plugs. On top of that there are heat range specifications to be considered. Other brands that are double-platinum and in the correct heat range may work equally well in your DII, but the 7070s are specified and proven.
The reason is that the DII uses a wasted spark ignition system. Google it. Conventional copper plugs wear out quickly if used in a wasted spark system.
Before I started taking care of my truck myself, a local shop installed conventional copper plugs. They lasted just 13,000 miles before the misfires appeared. I replaced them with the OEM Champion 7070s (RC11 PYP B4). They are double-platinum, and were still going strong 72,000 miles later when I replaced them proactively only because I was replacing the wires.
There is a lot of snake oil marketing with spark plugs. On top of that there are heat range specifications to be considered. Other brands that are double-platinum and in the correct heat range may work equally well in your DII, but the 7070s are specified and proven.
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