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DonSSDD


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Modern ignition coils question
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On my 2002 Tacoma v6, Ive been getting a miss in it, after it warms up. I get a cel with codes related to the O2 sensors. 

It has 3 coils serving 6 cylinders. In my old cars with coils, when they acted up, they work good when cold and intermittently act up when hot and under load. Do these new coils work the same, break down when hot?

Or can you test them somehow? With old coils, testing them was not reliable as they test fine lots of times and then when you replace them, it solves the problem. 

Or will a bad O2 sensor act up like a bad coil?

Thanks for any help and hope your Christmas is merry. 

Don



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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC.
1963- Pontiac top selling car in Canada

Mahone Bay, NS Still not old enough to need an automatic
Prefectca


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I dont know about Toyota, but on the Ford F-150 v6 from that era if the coil was cracked on the bottom it caused an intermittent miss and may not set a code for misfire. The coil had to be removed from the engine to see the cracks.

Paul

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OURWAGON


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DonSSDD wrote:

On my 2002 Tacoma v6, Ive been getting a miss in it, after it warms up. I get a cel with codes related to the O2 sensors. 

It has 3 coils serving 6 cylinders. In my old cars with coils, when they acted up, they work good when cold and intermittently act up when hot and under load. Do these new coils work the same, break down when hot?

Or can you test them somehow? With old coils, testing them was not reliable as they test fine lots of times and then when you replace them, it solves the problem. 

Or will a bad O2 sensor act up like a bad coil?

Thanks for any help and hope your Christmas is merry. 

Don

 HI DON, I DO NOT THINK AN O2 SENSOR WILL CAUSE A MISS.



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4SPEED427


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DonSSDD wrote:

On my 2002 Tacoma v6, Ive been getting a miss in it, after it warms up. I get a cel with codes related to the O2 sensors. 

It has 3 coils serving 6 cylinders. In my old cars with coils, when they acted up, they work good when cold and intermittently act up when hot and under load. Do these new coils work the same, break down when hot?

Or can you test them somehow? With old coils, testing them was not reliable as they test fine lots of times and then when you replace them, it solves the problem. 

Or will a bad O2 sensor act up like a bad coil?

Thanks for any help and hope your Christmas is merry. 

Don

 Have you narrowed down the miss to a specific cylinder(s)? If so, if the coils are all the same, swap them to a different cylinder to see if the miss follows the coil.



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DonSSDD


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I havent narrowed it down, it comes and goes, which makes me think its acting like an old coil, breaking down sometimes when it is heated up and under load for a while. I also have been without a garage since last March, got my new one water tight last Friday so will have a place to check things out indoors now. No heat or electrical yet though.

Ill check the wires and coils for cracks and check the plugs too and see what they look like. 



-- Edited by DonSSDD on Wednesday 25th of December 2019 09:18:29 PM

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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC.
1963- Pontiac top selling car in Canada

Mahone Bay, NS Still not old enough to need an automatic
DonSSDD


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There is a primary and secondary resistance check I can do on the coils, is this going to be meaningful on this type of coil? The problem comes and goes with load and after warm up, sometimes not there at all. So could a coil measure okfor resistance levels when cold but still be faulty?

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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC.
1963- Pontiac top selling car in Canada

Mahone Bay, NS Still not old enough to need an automatic
Lemans64


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Hi Don, those coils are usually pretty good, most of the time it's the wires that cause that condition.

The wires have a long bake lite material that breaks down and the spark comes out the side of it

instead of going down to the plug. Would recommend new wires and plugs. 02 sensor would not cause misfire. 

Pretty sure these have a double ground electrode and if replaced with normal type plugs it can cause intermittent 

misfires. 

 



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DonSSDD


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Thanks Rick, I put NGK Iridium plugs in it a couple of years ago, since read about the double ground plugs. Will try a set of stock style plugs and wires and see what that does. Truck has only 115,000 kms on it.

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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC.
1963- Pontiac top selling car in Canada

Mahone Bay, NS Still not old enough to need an automatic
Lemans64


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Does the 02 code say lean or? If lean it could have a dirty MAF sensor. It can be taken out and cleaned with spray carb cleaner.

It's the sensor inside the air cleaner housing, mass air Flow. There is 2 philips screws that can be removed to remove the sensor, 

once removed, look inside the black tube and in the bottom there is 2 small resistors that get dirty, clean them off with carb cleaner,

don't scrape them or you risk breaking them. Pretty hard to get anything in there anyway, LOL.

With that low of mileage I would try plugs first before buying wires.

 

 



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DonSSDD


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I replaced the MAF sensor a few months ago, after cleaning the original one, no change to the miss. Hard to know since it comes and goes very erratically.

My CAT rotted out about 3-4 years ago, got a new one which had both new sensors then. Think I did new Iridium plugs about 5 years ago, but they were not double grounded.

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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC.
1963- Pontiac top selling car in Canada

Mahone Bay, NS Still not old enough to need an automatic
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