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Ignition Coils #5276003 11/24/19 07:24 AM
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TheLawnRanger Offline OP
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The ignition coils on my 2012 Colorado haven't been changed as far as I know. They don't seem to be giving me any problems. Should I change them as preventative maintenance when I change the plugs or leave well enough alone? I'm coming up on 150,000 miles.


2011 Impala
2012 Colorado
Oil: 5w30 synthetic
Filters: Wix 51522 for both
Re: Ignition Coils [Re: TheLawnRanger] #5276015 11/24/19 07:36 AM
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eljefino Online Content
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Leave well enough alone. Perhaps carry a spare in your glove box though, and the tool to change it.

Lots of parts out there are "service grade", not OE. And this includes Delco.

Re: Ignition Coils [Re: TheLawnRanger] #5276025 11/24/19 07:50 AM
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Char Baby Offline
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They're not really a short term replacement item the way old style cap, rotor & plugs, wires used to be. I mean, they'll easily go 200K miles.

COP(coil on plug) are(can be) quite expensive. Cheap ones are, well, cheap! And what I mean by expensive is, around $80/ea. And you'll want to stay with OE IMO.

Also, they're kinda easy to diagnose by simply switching them out with another next to it. But, if there is an issue, the CEL should emit & throw a code if this is the case.

And typically you don't buy a whole set unless you have multiple bad ones...at the same time. You can sometimes get a deal on a whole set but, you'd have to shop. Again, stay with OE!

Last edited by Char Baby; 11/24/19 07:54 AM.

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Re: Ignition Coils [Re: TheLawnRanger] #5276071 11/24/19 09:12 AM
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JeffKeryk Online Content
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One went on wifey's 2006 TSX at about 190K.
About 15 miles from home and Silicon Valley traffic aint for the faint of heart.
It threw a code for #1 cylinder coil.
It has been replaced; I will replace the other 3 using a brand recommended by this forum.

This is the 1st time this car has broken down.
At 150K you should be OK, but my advice is, if you have any question, replace them.
Cheaper than a tow and shop repair.
Perhaps someone smarter than me knows how to test them beyond good or bad.


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Re: Ignition Coils [Re: TheLawnRanger] #5276098 11/24/19 09:44 AM
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irad Offline
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Check your spark plug gap. Bigger gap than spec puts a strain on the coil. Change or regap your plugs will extend the life of the coil.

Re: Ignition Coils [Re: JeffKeryk] #5276133 11/24/19 10:33 AM
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ecotourist Offline
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Originally Posted by JeffKeryk
One went on wifey's 2006 TSX at about 190K.
About 15 miles from home and Silicon Valley traffic aint for the faint of heart.

I had the single coil go on my now pre-historic '65 Comet. Wouldn't you know it, it failed on a busy, hilly, 2 lane highway having practically no shoulders and 30+ miles from home. [For those who know Saskatchewan, it was that infamous 39 mile stretch of Highway 5 near Saskatoon.] It would run but hardly pull on the hills. That also was not for the faint of heart.

I got it home somehow. But knowing what I know now, I should have had it towed.

The good thing is that a single coil is cheap and easy to replace. The bad thing is that when it goes, you lose all your cylinders.


2000 BMW 528i 5MT M Sport
2007 Honda Accord EX-L 4Door V6 6MT
Re: Ignition Coils [Re: TheLawnRanger] #5276193 11/24/19 11:58 AM
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slacktide_bitog Online Content
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Coils are not wear items to be replaced at regular intervals smile

Re: Ignition Coils [Re: irad] #5276211 11/24/19 12:21 PM
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Y_K Offline
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Originally Posted by irad
...Change or regap your plugs will extend the life of the coil.


This and replace the coil boots, they are full of hidden cracks by 150k miles.


Here is an example on Toyota 2UZ engine coil boot


Re: Ignition Coils [Re: TheLawnRanger] #5276226 11/24/19 12:40 PM
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Oro_O Offline
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I typically buy two or three off a wreck, and keep one or two in the spare tire well or somewhere.

We have a Lexus ES that gets driven A LOT. It is at 315k miles and just lost a 2nd coil this past week; it lost one about three or four years ago about 250k. So it's not a common occurrence requiring preventative replacement.

Re: Ignition Coils [Re: irad] #5276280 11/24/19 01:47 PM
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Gebo Offline
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Originally Posted by irad
Check your spark plug gap. Bigger gap than spec puts a strain on the coil. Change or regap your plugs will extend the life of the coil.


+1


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Re: Ignition Coils [Re: slacktide_bitog] #5276488 11/24/19 05:50 PM
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JeffKeryk Online Content
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Originally Posted by slacktide_bitog
Coils are not wear items to be replaced at regular intervals smile

I used to think this way. I think a little differently now.
Too bad there is not some data somewhere to track failure rates based on brand, age and mileage.
For the price I paid to get it fixed and the inconvenience, replacing all 4 in the TSX would have been a bargain.
They lasted over 190K miles and almost 13 years.

Afterwards I bought 3 more; next oil change they are going in.

Last edited by JeffKeryk; 11/24/19 05:50 PM.

2018 Tesla Model 3, Medium Range Battery
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2006 Acura TSX
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Re: Ignition Coils [Re: TheLawnRanger] #5276618 11/24/19 08:33 PM
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MaximaGuy Offline
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Ignition coils are not a PM item - most good engine makers make reliable ignition coils that last a lifetime (but for Nissan back in the 5th gen Maximas),
I wouldn't replace them although if you are concerned and have the money why not add it to a plug job


2018 MB GLE350
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Re: Ignition Coils [Re: slacktide_bitog] #5276631 11/24/19 08:45 PM
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Originally Posted by slacktide_bitog
Coils are not wear items to be replaced at regular intervals smile


"Replacing them is cheap insurance"
"I don't want a failed one to leave me stranded"

Standard responses one might expect.... crzy

I always wonder, do people replace working alternators as preventative maintenance ? Starters ? Light bulbs ?

Re: Ignition Coils [Re: TheLawnRanger] #5276690 11/24/19 10:09 PM
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The question is when it will fail not if.


2018 Tesla Model 3, Medium Range Battery
2018 Lexus RX450h
2013 Lexus GS350 F Sport
2006 Acura TSX
2001 Tundra Access Cab, 1998 Accord LX, 1968 Corvette L36 Roadster, 1965 Olds 4-4-2
Re: Ignition Coils [Re: TheLawnRanger] #5276729 11/25/19 01:02 AM
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GMBoy Offline
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I only replace them as they fail and I have been using Spectra Premium Blue streak coils with no problems. They are reasonably priced on Rockauto. I have 1 that has just hit 85k miles when the OEM one failed at 55k miles so I don't always buy into the only buy OEM coils. Coils are not a real complex item to produce like some sensors where I do prefer OEM over aftermarket.

Last edited by GMBoy; 11/25/19 01:03 AM. Reason: spelling
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