Double Iridium Spark Plugs? - Taurus Car Club of America : Ford Taurus Forum
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post #1 of 12 (permalink) Old 08-19-2018, 05:00 PM Thread Starter
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Double Iridium Spark Plugs?

I ordered six Bosch double iridium spark plugs for my 07 Taurus (vulcan), they have the same fit, but will it be okay for my engine? I don't believe 'double iridium' was a thing back in 07, & I'm a little worried they somehow won't be compatible. The owner's guide is no use on spark plugs. I'm assuming a metal is a metal; my car originally came with platinum, but the prev owner had a friend install 5/6 new plugs, all copper, so I think double iridium might be a savior. Insight?

An average of 170 miles put on my car daily & she's more reliable than a rental.
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post #2 of 12 (permalink) Old 08-19-2018, 10:49 PM
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I'd recommend oem fine wire Motorcraft or NGK plugs. Past 3.0's didn't care for Bosch plugs.
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post #3 of 12 (permalink) Old 08-20-2018, 12:14 AM
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Quote:
Originally Posted by sheila View Post
I'd recommend oem fine wire Motorcraft or NGK plugs. Past 3.0's didn't care for Bosch plugs.
I had an experience like that. I put nice Champions in a Honda Civic and it ran like crap. That didn't make sense since a spark plug is just a spark gap. The parts counter guy told me Jap cars don't like Champion plugs and sold me a set of Nippon Denso and problem solved. I can't figure it but that's the way it is.

I'd say if the car runs good and the heat range of the plug is correct for the engine then you should be fine with the double platinum plugs. When I fix a car up to sell, I put in the copper plugs on sale and it runs-good-lasts-a-long-time. In my experience, the condition of the wires and coil pack make a lot more difference. I never saw a Taurus with plug problems. Windstar a different matter altogether.
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post #4 of 12 (permalink) Old 08-20-2018, 06:03 AM
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Quote:
Originally Posted by 46davis View Post
I had an experience like that. I put nice Champions in a Honda Civic and it ran like crap. That didn't make sense since a spark plug is just a spark gap. The parts counter guy told me Jap cars don't like Champion plugs and sold me a set of Nippon Denso and problem solved. I can't figure it but that's the way it is.

I'd say if the car runs good and the heat range of the plug is correct for the engine then you should be fine with the double platinum plugs. When I fix a car up to sell, I put in the copper plugs on sale and it runs-good-lasts-a-long-time. In my experience, the condition of the wires and coil pack make a lot more difference. I never saw a Taurus with plug problems. Windstar a different matter altogether.
I have had the problem in the pic twice. Carbon tracking and the issue is, in this case this plug is very loose in the wire. New MC wire, the top post of the plug does not match standard wires. 2 of 6 had small posts. In the other pic, same brand out of the box. I would inspect any new plugs carefully.


With the effort of changing plugs, I would not worry about cost. Good plugs are cheap. Double platinum always with waste spark system. COP does not really care about double platinum.
-chart-
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post #5 of 12 (permalink) Old 08-20-2018, 06:19 AM
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For some reason I cant recall, I tried Bosch plugs in my long gone 91 Escort. Ran like total crap. Unstable idle, MPG dropped 25%, etc. Took the plugs out and carefully inspected them. No carbon tracking, no cracked insulators, gap correct, etc. Took them back and got 4 new Bosch replacements. Still ran like crap. Replaced plugs with the correct Motorcraft plugs, and it ran perfectly.

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post #6 of 12 (permalink) Old 08-20-2018, 10:02 AM
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^+1. Same experience with a Windstar.
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post #7 of 12 (permalink) Old 08-20-2018, 12:33 PM
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@sheila: Poor old Windstar. My wife loved it. What a badly designed engine.

@JeffK: That was my esperience with the Honda. No explanation.

@chartmaker: Wow! Looks like Autolite had a major QC problem. The length of the tower determines the temperature the plug runs at and is matched to the characteristics of the engine. For there to be two different tower lengths on two otherwise identical plugs is totally unacceptable. If the plug runs too hot, it can cause preignition and detonation (knock). Same if it's too cold and loads up with carbon and incandesces.
The carbon tracking you see is probably not the fault of the plug unless the resistor element inside is totally burned out. Dirt and soot in the plug boot usually causes that when it absorbs moisture from outside. Ford manual says use DC-4 compound which is silicone grease when you put the boots back on. It's an excellent dielectric and keeps out water. You can use regular grease in a pinch. The boots are petroleum resistant. DC-4 is good when you put electrical connectors back together especially where they might get exposed to splash water a lot, like downstream oxy sensor connectors and ABS connectors.
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post #8 of 12 (permalink) Old 08-20-2018, 04:39 PM Thread Starter
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Iridium is on the right, the copper that were installed is on the left. Does the little notch in the iridium matter? I guess I'll just install & see what happens. Sorry for my newbness, this is all new to me.
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An average of 170 miles put on my car daily & she's more reliable than a rental.
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post #9 of 12 (permalink) Old 08-20-2018, 09:38 PM
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Notch?
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post #10 of 12 (permalink) Old 08-20-2018, 09:43 PM
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Double Irridium in a Vulcan is just wasting money. Motorcraft Platinum and done.
After putting a pair of Bosch Platinums in my old 98 Windstar and having it run like complete and total junk, I'll never buy another Bosch plug.

John
2007 Pontiac Torrent, 2013 Hyundai Sonata GLS
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