Author Topic: Automotive coil question  (Read 360 times)

Online fotoguzzi

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Automotive coil question
« on: February 06, 2023, 05:46:06 PM »
Iím stuck trying to fix my wifeís cousins car. Toyota mini van. It has individual coils over each plug. I replaced one coil a year ago but now the engine light is back on, code says itís the same coil.
Could this be caused by the spark plug?
MINNEAPOLIS, MN

Online LowRyter

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Re: Automotive coil question
« Reply #1 on: February 06, 2023, 05:51:02 PM »
Any chance you could warranty claim on this one?

I say this because I know a rider with one of those 1600 Beemer 6 cylinder luxo barges.  Those things are $250/ ea.  Anyway after the 2nd one went out they gave him a warranty replacement,,,not saying it was the same one btw. 
John L 
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Online fotoguzzi

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Re: Automotive coil question
« Reply #2 on: February 06, 2023, 07:15:24 PM »
Not a chance, itís an older van. I did buy aftermarket for around $30 instead of $90. I guess maybe that was a mistake but sheís kinda poor and so am I.
I feel a little responsible since I talked her into getting the Toyota and selling the Chrysler van that would break down regularly about every two or three months.
« Last Edit: February 06, 2023, 07:16:44 PM by fotoguzzi »
MINNEAPOLIS, MN

Online rocker59

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Re: Automotive coil question
« Reply #3 on: February 06, 2023, 07:49:09 PM »
Yep.  Very likely the coil. 

Buy a party pack of them, so you'll have extras on hand.

Marcia's 4.6L Ford V8 she used to have went through coils pretty regularly.  It's a quick fix, if you keep extras on hand.
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Re: Automotive coil question
« Reply #3 on: February 06, 2023, 07:49:09 PM »

Online fotoguzzi

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Re: Automotive coil question
« Reply #4 on: February 06, 2023, 07:56:13 PM »
Yep.  Very likely the coil. 

Buy a party pack of them, so you'll have extras on hand.

Marcia's 4.6L Ford V8 she used to have went through coils pretty regularly.  It's a quick fix, if you keep extras on hand.
in this case itís a quick fix on the front 3 but cylinders 2,4&6 are buried to the back and take a real mechanic to get at. Lucky for me so far itís always cylinder 1.
Yes, I told her to order a few.
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Offline Bulldog9

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Re: Automotive coil question
« Reply #5 on: February 06, 2023, 08:16:09 PM »
I've found that the cheap aftermarket coils don't last. on a TMC product, I would use OEM or Denso coils. Also, if the plugs are not old, probably a good idea to swap plugs in two of the cyls. If the 'failed' coil follows the plug, it is likely the plug.

How many miles did you get out of the new coil?
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Offline Andrew Doyle

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Re: Automotive coil question
« Reply #6 on: February 06, 2023, 08:25:54 PM »
Likely the coil

however, there are no pictures to confirm

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Re: Automotive coil question
« Reply #7 on: February 06, 2023, 10:29:12 PM »
Not a chance, itís an older van. I did buy aftermarket for around $30 instead of $90. I guess maybe that was a mistake but sheís kinda poor and so am I.
I feel a little responsible since I talked her into getting the Toyota and selling the Chrysler van that would break down regularly about every two or three months.
'

I meant a claim on the coil you bought.....
« Last Edit: February 06, 2023, 10:30:03 PM by LowRyter »
John L 
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Re: Automotive coil question
« Reply #8 on: February 06, 2023, 10:43:28 PM »
If it's not too hard, pull all three plugs from that side and see if one is obviously different in appearance. 

Or, swap the plugs around and see if the problem moves to a different cylinder.

Or, swap the coils around.
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Offline pressureangle

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Re: Automotive coil question
« Reply #9 on: February 07, 2023, 05:58:38 AM »
It's the Chinese conspiracy. Aftermarket parts have no reliable quality. You might have better luck pulling moderate mileage OEM coils from a wreck at the yard. And yes, the spark plug being worn can affect coil life.
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Re: Automotive coil question
« Reply #10 on: February 07, 2023, 06:09:22 AM »
I've found that the cheap aftermarket coils don't last. on a TMC product, I would use OEM or Denso coils. Also, if the plugs are not old, probably a good idea to swap plugs in two of the cyls. If the 'failed' coil follows the plug, it is likely the plug.

How many miles did you get out of the new coil?

Yep!  Af friend of mine who trains mechanics would agree.  He once told me I had the world record for an aftermarket mass air flow sensor on my GMC that lasted six weeks.

Swapping the plugs is a great diagnostic method.
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