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Possible bad Iridium plug #5195005 08/23/19 07:57 PM
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Eric Smith Online Content OP
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Our beloved 02 Focus (I say that sarcastically) has had issue's starting with after it rained it didn't want to start. Lately it's been all the time but once it's warmed up it's fine. It had been getting a misfire code on the 3rd cylinder but I assumed it was ignition related since it had prior coil issues. I tried swapping in a older coil to see if the behavior was the same which it was. Tested the spark plug wires with the multimeter and they tested ok, also tried changing the CPS since it was giving some odd readings but I think the how-to I was reading was incorrect. Finally said the heck with it let's change the plug.. The plug wasn't damaged and looked the same as all the others. But my wife has drove it all week without any issues even after it rained.

I find it odd as I haven't had a bad plug for over twenty years and that was on a Briggs. Disclaimer though I did have to replace the head last year. Possibly something occurred during that time but couldn't say what, it was stored inside and not dropped. She claimed it did the same thing even before the valve seat went out for lunch but can't say 100%. A older plug I saved from the last change is in there now, the new Motorcraft SP504 only had 12k on it. Had two rounds of with a brand new fan clutch being bad but spark plugs...


05 Chevy 3500 (Class C RV) 66k
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00 Dakota 93k
91 Festiva 257k .. Rust bucket
Re: Possible bad Iridium plug [Re: Eric Smith] #5195023 08/23/19 08:30 PM
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BigCahuna Offline
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Swap the wire from the suspect cyl, with another cyl ,and see if the code follows the wire. Checking it with a meter only checks continuity. it might be leaking to ground which would give it a misfire.,,

Re: Possible bad Iridium plug [Re: Eric Smith] #5195043 08/23/19 09:07 PM
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slacktide_bitog Offline
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Motorcraft is Autolite.

I did this job on a Focus and used NGK Laser Platinum plugs and the NGK wires. They are awesome smile

Re: Possible bad Iridium plug [Re: slacktide_bitog] #5195143 08/24/19 04:19 AM
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Lubener Offline
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Originally Posted by slacktide_bitog
Motorcraft is Autolite.

I did this job on a Focus and used NGK Laser Platinum plugs and the NGK wires. They are awesome smile

No no, Autolite is Motorcraft.


The "thinking" man's friend.
Re: Possible bad Iridium plug [Re: Eric Smith] #5195158 08/24/19 05:06 AM
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MasterSolenoid Offline
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I had a problem with [2 out of 6] 'new' Autolite (iridium) plugs about 3 years ago.

Before installing, I examined them with a magnifying glass, and noticed
the 'center' electrode (which has a very small diameter when new) was even smaller still at very end because of bad machining.
I took them back for replacements but should have contacted the manufacturer.

With automation today, there's no telling how many were produced.


2002 Ford Ranger / bought new
2 Wheel Drive
3.0 Liter Engine
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Re: Possible bad Iridium plug [Re: BigCahuna] #5195187 08/24/19 06:40 AM
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WyrTwister Offline
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Originally Posted by BigCahuna
Swap the wire from the suspect cyl, with another cyl ,and see if the code follows the wire. Checking it with a meter only checks continuity. it might be leaking to ground which would give it a misfire.,,


Exactly what I was thinking .

What is CPS ?

Is that car a 4 cylinder ?


Wyr
God bless
Re: Possible bad Iridium plug [Re: Eric Smith] #5195214 08/24/19 07:24 AM
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Rand Offline
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CPS=crank position sensor?


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