09-12-2018, 07:38 PM
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#1
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Ignition Coil life span?
What is the usual lifespan of the ignition coils of our 3rd gens and what kind of issues would they cause when they do start to fail?
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1999 Limited
265/75/16 AT51's
Bilstein 4600
Last edited by Mudeprived; 09-12-2018 at 07:47 PM.
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09-12-2018, 07:57 PM
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#2
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Senior Member
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Join Date: Feb 2014
Location: Minneapolis, MN
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They either work or they don’t. There is no in between where a coil would not work one day and then work the next.
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2001 Sport Edition 4WD, IJM, Auto, DD
1999 SR5 4WD, Millennium Silver Metallic, 5 speed, E-locker, Trail Rig
1998 SR5 4WD Custom bodywork from hitting a median. Beater truck.
1999 Limited 4WD No longer a vehicle. Now it's in parts and stored away.
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09-12-2018, 08:21 PM
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#3
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Quote:
Originally Posted by MN4runnerman
They either work or they don’t. There is no in between where a coil would not work one day and then work the next.
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That "gray area" is coils failing when hot and throwing errors. Vehicles that run fine when cold but as the coil gets hot it fails.
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09-12-2018, 09:00 PM
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#4
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Quote:
Originally Posted by Mudeprived
What is the usual lifespan of the ignition coils of our 3rd gens and what kind of issues would they cause when they do start to fail?
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They could last a million miles or more like a lot of sealed electrical components. But one could fail at any time. Also but...The coil boots are replaceable, those are the things that have a finite life. The rubber breaks down and gets hairline cracks from heat and arcs out. So good to replace the coil boots when replacing a wire set. For the 3.4L you can get an oem Denso set of 3 from rockauto for $32.79.
https://www.rockauto.com/en/moreinfo...357455&jsn=384
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09-12-2018, 10:48 PM
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#5
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Quote:
Originally Posted by dogtail
They could last a million miles or more like a lot of sealed electrical components. But one could fail at any time. Also but...The coil boots are replaceable, those are the things that have a finite life. The rubber breaks down and gets hairline cracks from heat and arcs out. So good to replace the coil boots when replacing a wire set. For the 3.4L you can get an oem Denso set of 3 from rockauto for $32.79.
https://www.rockauto.com/en/moreinfo...357455&jsn=384 |
I didn't know you could order just these. Thanks for the link, I'm gonna get some for my next spark plug job, Mine are getting a little mushy and worn.
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2008 Toyota 4Runner Limited 4x4 - Salsa Red, DD, Mostly Stock, 89k miles
2001 Toyota 4Runner SR5 4x4 - Not Stock, Lifted, Armored, 291k miles
1987 Toyota Supra N/A - Stock, 2nd Owner, 92k miles
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01-15-2022, 10:23 PM
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#6
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inflation to the moon
Quote:
Originally Posted by dogtail
They could last a million miles or more like a lot of sealed electrical components. But one could fail at any time. Also but...The coil boots are replaceable, those are the things that have a finite life. The rubber breaks down and gets hairline cracks from heat and arcs out. So good to replace the coil boots when replacing a wire set. For the 3.4L you can get an oem Denso set of 3 from rockauto for $32.79.
More Information for DENSO 6716248 |
Jan 2022 im reading this to see about potentially getting new ignition coils for my new to me 4runner with 200k. seen this post from 2018 where a 3pack of denso coils was going for 33 dollars on rockauto. Today that same coil in a SINGLE pack from rockauto is 37 dollars.
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01-15-2022, 11:15 PM
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#7
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Quote:
Originally Posted by goblincat
Jan 2022 im reading this to see about potentially getting new ignition coils for my new to me 4runner with 200k. seen this post from 2018 where a 3pack of denso coils was going for 33 dollars on rockauto. Today that same coil in a SINGLE pack from rockauto is 37 dollars.
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The link you’re referring to is for the coil boots only, not the coils themselves.
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2002 SR5 Sport 4WD
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01-16-2022, 03:27 AM
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#8
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I replaced all 3 last year, just because 24 years. Got from Amayama, saved a few $$ even after the shipping costs were added.
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97 4R SR5, 4WD/Elock, 3.4, 5spd. OME881/890 springs/OME shocks, 265/70/16 BFG AT/KO2.
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01-16-2022, 03:05 PM
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#10
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I put new coil packs on ( Denso...rock auto) this fall with a full tune up ( wires/plugs) and a bunch of other stuff. I had the coils sitting around from another project so thought why not. I was having no issues or codes. Just age ( now 22) and miles (245k) I thought why not. Old coils are in my parts bin.....just in case.
I have found on past projects for them to go bad when hot and have had them just flat out quit. I have also had one where when doing a tune up , that the harness connecting to a coil went bad and would not click on again tight, those too can get brittle with age.
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2000 SR-5 Highlander version 4:30's, factory locker , green, bought 6/21
2001 SR-5... bought 11/20..sold 6/21....
2000 SR-5 moded, lifted, e locker, other cool stuff, totaled 10/20
Last edited by 3bears; 01-16-2022 at 03:09 PM.
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01-17-2022, 01:24 PM
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#11
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Member
Join Date: May 2015
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Quote:
Originally Posted by goblincat
Jan 2022 im reading this to see about potentially getting new ignition coils for my new to me 4runner with 200k. seen this post from 2018 where a 3pack of denso coils was going for 33 dollars on rockauto. Today that same coil in a SINGLE pack from rockauto is 37 dollars.
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Just checked. RockAuto I'm seeing for a 99 4runner 3.4L Denso 3 pack of coil boots part #6716248 is $40.89
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*1999 3.4L, 4wd/5spd, swapped motor and trans, heavy use DD, seasonal rust proofing using WD-40 only
*2000 3.4L, 4wd/5spd, parts rig, picking the carcass
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