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Ignition Wires #5421074 05/04/20 06:46 PM
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RAK Offline OP
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Are the spark plug wires supposed to be changed when replacing the old spark plugs? The owner's guide indicates the mileage as to
when to install new plugs, but there is no mention of the ignition wires. Any input would be helpful---thanks in advance!


2003 Ford Mustang 3.8L
Re: Ignition Wires [Re: RAK] #5421088 05/04/20 07:07 PM
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CR94 Online Content
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Only if there's a problem. Conventional high-voltage cables (if that's what you have) are simple to check with an ohmmeter.


2011 Toyota Prius now at 110K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K
Re: Ignition Wires [Re: RAK] #5421109 05/04/20 07:31 PM
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bbhero Online Content
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My interesting observation with my Nissan Sentra... 1995... Car started running not so good.. . So I changed rotor, distributor cap, plugs... Car ran better but still had a noticeable miss at times... went back to AAP... Got spark plug wires... Last thing I could think of to do and then it was on to the fuel system... Sure enough started the car up and it ran perfect... Two years later car started missing a bit again... I just changed the wires and it got the car running right again. .

On a old school type set up with rotor, distributor cap... The wires should be changed...

New setup like my 08 Nissan Altima 3.5 I have had the plugs only changed two times... No wires needed changing.


Nissan Altima 3.5 Coupe
Cam2 Full synthetic 5w30 Carquest Blue 84356
"Treat your family like your friends and treat your friends like your family."
Re: Ignition Wires [Re: RAK] #5421126 05/04/20 07:48 PM
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BISCUT Online Content
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Wires! Now that's cool! So use to coil overs don't think wires much anymore.


2015 F150 Lariat M1 5-30 EP FRAM Ultra(46k)
2017 Sub OB M1 5-30 EP FRAM Ultra(76k)


Re: Ignition Wires [Re: RAK] #5421133 05/04/20 07:57 PM
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joel95ex Offline
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you can check ohms and also run the car in total darkness and look for very faint/dim arcing like static electricity appearance. new cars with COP's won't need anything except a coil and recommend to do all at the same time


95 Accord 4cyl Vtec. 500,000+miles. RIP 😢
13 sonata killed by a deer @ 156k miles
07 civic SI 179k miles PP, M1 10w-30 fram ultra
18 santa fe 55k PP 5w-30 oem filter
Re: Ignition Wires [Re: joel95ex] #5421138 05/04/20 08:01 PM
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bbhero Online Content
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I think you are right ^^^^^^^^↑

Change all coils at the same time...

My cars coils are like 95 bucks per coil... Near $600 for all six.... Makes plugs look cheap by comparison LOL

At 7.99 a plug Denso iridium TT plugs...

And changing plugs help keep coils from going into failure mode...


Nissan Altima 3.5 Coupe
Cam2 Full synthetic 5w30 Carquest Blue 84356
"Treat your family like your friends and treat your friends like your family."
Re: Ignition Wires [Re: RAK] #5421158 05/04/20 08:24 PM
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slacktide_bitog Online Content
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Yes, you should replace the wires along with the spark plugs smile

NGK makes a great set of wires

Re: Ignition Wires [Re: bbhero] #5421161 05/04/20 08:25 PM
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JeffKeryk Offline
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Originally Posted by bbhero
I think you are right ^^^^^^^^↑

Change all coils at the same time...

My cars coils are like 95 bucks per coil... Near $600 for all six.... Makes plugs look cheap by comparison LOL

At 7.99 a plug Denso iridium TT plugs...

And changing plugs help keep coils from going into failure mode...


Others will disagree, but when coils get close to 200K miles, I like to change them.
I use Denso, as they are OEM to many supplies.
As you know, factory coils are pretty dang pricey.


2018 Tesla Model 3, Medium Range Battery
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Re: Ignition Wires [Re: RAK] #5421184 05/04/20 08:47 PM
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stanlee Offline
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I have a vehicle (Ford 4.0L OHV Cologne) that still uses wires. The AutoZone Duragold last about 50-60k miles. I change the spark plugs about half that interval. Had a VR6 12V that also used wires. Had it until 140k miles on the original wires.

Re: Ignition Wires [Re: JeffKeryk] #5421257 05/04/20 10:37 PM
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bbhero Online Content
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Originally Posted by JeffKeryk
Originally Posted by bbhero
I think you are right ^^^^^^^^↑

Change all coils at the same time...

My cars coils are like 95 bucks per coil... Near $600 for all six.... Makes plugs look cheap by comparison LOL

At 7.99 a plug Denso iridium TT plugs...

And changing plugs help keep coils from going into failure mode...


Others will disagree, but when coils get close to 200K miles, I like to change them.
I use Denso, as they are OEM to many supplies.
As you know, factory coils are pretty dang pricey.



Yeah I have 305k miles on my original coils. . Still runs very well... Not too shabby.


Nissan Altima 3.5 Coupe
Cam2 Full synthetic 5w30 Carquest Blue 84356
"Treat your family like your friends and treat your friends like your family."
Re: Ignition Wires [Re: RAK] #5421344 05/05/20 05:47 AM
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Vehicles like a GM 3800 series motor require new spark plugs every 100k miles. In this engine you nearly destroy the OE wires coaxing them out particularly the back 3 on the first plug swap and you'll need new wires. If we're talking about the car in your sig and they're original wires, do it.


1979 Garelli Rally Sport
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Re: Ignition Wires [Re: RAK] #5421384 05/05/20 07:13 AM
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GMBoy Offline
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I do plug wires at every spark plug change. They are not that expensive and they usually get damaged on removal anyhow. The heat of the engine bay and ozone all take a toll on the wires as well.

Re: Ignition Wires [Re: RAK] #5421387 05/05/20 07:19 AM
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Lubener Offline
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Spark plug wires last a long time. If you have any suspicions, spray them lightly with water at night. If you do not have a light show and resistance doesn't exceed 5k ohms per foot, they are still good.


The "thinking" man's friend.
Re: Ignition Wires [Re: RAK] #5421443 05/05/20 08:41 AM
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Back in the days of secondary wires, only PACKARD
knew the secret to make good performing and reliable
ignition wire. Even Nippon Denso would import bulk wire to Japan
to build wire sets. You will see this on the older Subaru.

There was something special in the latex insulation under the Hypalon jacket that seemed to make it more resistant to arcing or jumping.

Remember the internal resistance "wire" is just graphite on fiberglass then wrapped with tape.
You cant run copper or steel wire unless its tight "spring wound" to suppress radio noise ( EMI/ RFI).
These system are designed to work with a synergy, you cant just willy-nilly "change the circuit" by changing R/L/C values by going to MAG wire.

Old timer trick;
Tune a Am pocket radio to either end of the band (1610 khz) turn it on, and move it around the wires. You will hear
"snapping "through the speaker if there is a leaky wire. If you suspect a bad wire, you can move the wires a bit where they bend or touch the rocker cover(s) or the block or exhaust heat shielding.. Also look for "spark shows" at night. HEI used to develop a corona over the ceramic plug insulators in humid weather.
This is why keeping the plug insulators pristine is so important in a tune up. It's a "white glove" kind of job. Treat them like Quartz Iodine bulbs.
-Ken


2019 VW Jetta S 6MT OCI#2 7378mi-MOTUL Specific VW508.00+VW Service Filter; '17 Subaru Crosstrek CVT OC#9 70254mi-Rotella
Gas Truck 5W20 + Fram Ultra 7317 Filter
Re: Ignition Wires [Re: RAK] #5421486 05/05/20 09:50 AM
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mclasser Offline
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I decided to change my wires around 190k just for the heck of it. Car ran the exact same before & after. Read later that Honda wires at least tend to last forever.


2018 Hyundai Elantra VE
2013 Honda Pilot EX-L 4WD
2002 Honda Accord EX-L

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