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11 votes

Do primary and secondary coil resistances correspond to number of windings?

Unfortunately no. This is because the primary and secondary windings don't use the same wire. The primary uses a few turns of a thick wire. While the secondary uses many turns of a thinner wire. The ...
vini_i's user avatar
  • 16k
10 votes

Do I change all four coils when I change one spark plug that is faulty

You shouldn't need to change the spark plug coils unless they are faulty, so the answer to your question is no, you don't need to replace the coils again. There probably wasn't a need to replace all ...
HandyHowie's user avatar
  • 25.5k
9 votes

Do primary and secondary coil resistances correspond to number of windings?

IMHO the only reliable way of telling the winding relation would be to feed an low voltage alternating current with known amplitude into the primary winding and measure the amplitude of the secondary. ...
Martin's user avatar
  • 8,468
7 votes

Spark plug and coil only one is bad for 2012 Honda odyssey

If you find the coil is bad, change just the coil. You can do this without issue. If you find the spark plug is bad, change all of them. When spark plugs start going bad, it is a good bet others will ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
6 votes

Do primary and secondary coil resistances correspond to number of windings?

You could avoid the shock risk mentioned by @Myself, perhaps at the loss of some precision in the measurement, by applying the known source to the secondary winding. That way you're using the coil as ...
dlu's user avatar
  • 14.5k
5 votes
Accepted

What are the benefits of direct ignition (coil on plug) system?

Coil on plug has several advantages over conventional distributor type systems: 1) Less voltage loss from the coil to the plug. With fewer connections and the elimination of the distributor rotor to ...
Fred Wilson's user avatar
  • 11.6k
5 votes

Can I replace my ignition coil with a ECU?

There are a number of ways to go solid-state ignition and there are a few open source projects that allow you to build your own ECU and loom and utilize an ignition system from something else. One ...
Steve Matthews's user avatar
5 votes
Accepted

How is ignition coil feedback useful?

Pᴀᴜʟsᴛᴇʀ2's answer is pretty much correct, at least for Toyotas (the linked post in the OP was for a Lexus aka Toyota). Here is some extra detail. Also "feedback" is used for different things in ...
Jason C's user avatar
  • 4,890
5 votes
Accepted

Engine not starting after melted Ignition Coil

This issue is, you have serious cylinder pressure (or should I say, non-pressure) issues. The pressure test results you give (as long as the test was done correctly), shows a massive drop in cylinder ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
5 votes

How does this ignition coil work? Why are there two wires, and where should they be connected?

The usual idea is that with 2 wires; one is ignition controlled 12v and goes to the resistor (block on the side with two terminals) so that the coil receives about 9v during normal running. The other ...
Solar Mike's user avatar
  • 34.7k
4 votes

How is ignition coil feedback useful?

The ignition confirmation signal is a comeback signal to the ECM. This tells the computer a successful spark has occurred: the coil has launched it's goods. When the signal fails, the computer knows ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 votes

Coil On Plug, Testing The Primary Coil

Check out the General Technologies TA500. This tool is quite inexpensive (for its incredible capabilities) and very flexible. Perhaps not for the DIY set, but there's no probing involved and it ...
SteveRacer's user avatar
  • 12.4k
4 votes

Do primary and secondary coil resistances correspond to number of windings?

There were already good answers, I'd like to add some points and also write something about the inductance. Here is a sketch of a typical coil: (Source) Resistance There are in principle two ...
sweber's user avatar
  • 7,057
4 votes
Accepted

Accessing the 1st and 2nd cylinder ignition coils in VW Golf MK5 (55 kw)

Take the white piece out by gently wiggling it. Should come out fairly easily (with some resistance). Then, grab the entire filler assembly and turn it counterclockwise. It has two tabs on it which ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 votes
Accepted

Can swapping ignition coils fix a cylinder four misfire?

It normally wouldn't, however, I'm thinking the problem might have been the wiring connector to the coil wasn't making a good connection (or possibly causing an intermittent connection), which was ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 votes
Accepted

Is it possible to have a good looking spark but but still not suitable for ignition?

Inside the cylinder is quite a hostile environment. What looks like a strong looking spark at atmospheric pressure outside of the cylinder can become nothing at high pressures in a fuel rich ...
HandyHowie's user avatar
  • 25.5k
3 votes

Misfire in single cylinder 4 stroke engine

In my experience, you are not describing a misfire. A misfire is a lost power cycle. It would typically be evident during steady engine speeds, or especially noticeable under the load of acceleration, ...
CharlieRB's user avatar
  • 9,015
3 votes

Remanufactured 5.3 engine not firing on one bank

This post is old but today I was called out to a truck with the same problem. It turned out that one of the coils had shorted out and blew the fuse for the left bank. I replaced the coil and replaced ...
Dan's user avatar
  • 31
3 votes

Coil popped out of head

Your spark plug was loose If the spark plug was loose and gone, based upon your comments, the coil did not pop out of your head, the sparkplug popped out of your head. The last change of the ...
DucatiKiller's user avatar
  • 32.9k
3 votes

How to know if the spark plug or the ignition coil needs to be replaced

To test the coil, as you said there's only one cylinder that isn't working, just switch the coils of two cylinders. For the spark plugs, again you'll just switch two if you want to test one against ...
Cullub's user avatar
  • 1,364
3 votes

Engine not starting after melted Ignition Coil

A bad starter wouldn't cause misfires or high engine temps, and there aren't any "safe modes" that prevent starting. Test your battery, make sure it is healthy Inspect your belts, make sure they or ...
tlhIngan's user avatar
  • 12.2k
3 votes
Accepted

Replaced ignition coil pack - should I replace spark plug too?

No. There should be absolutely no reason for concern. Even if it was an old plug, I wouldn't be worried. If the coil isn't firing, it means there's no electricity being passed. The plug is just ... ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
3 votes

Engine shakes, from bad oil change

If the oil looks like it could have come out of the open dipstick tube, which is entirely possible, then I would suggest that you get the engine thoroughly cleaned using a jet wash and engine de-...
HandyHowie's user avatar
  • 25.5k
3 votes

Spark plug and coil only one is bad for 2012 Honda odyssey

Try swapping the #3 coil with another cylinder and see if the problem follows. Try swapping the #3 spark plug with another cylinder and see if the problem follows. That should let you know where the ...
jwh20's user avatar
  • 12.1k
2 votes

How to know if the spark plug or the ignition coil needs to be replaced

The best way to test a spark plug in home conditions is to remove all plugs, put them in coils, put the spark plug (metal part, thread) on a engine metal part (earth), and turn a key, or better to ask ...
Arturs Bolsunovskis's user avatar
2 votes
Accepted

04 Lexus ES330 Multiple Ignition Coil Failures / Poor Coil Feedback Signal

Well, you already found the big hint somewhere else: Ben wrote: It would be hard to test the coils off the car without some kind of setup to generate the trigger signal. Actually I just ...
Jason C's user avatar
  • 4,890
2 votes
Accepted

Can Getting Fuel Injectors or Ignition Coils Wet Ruin Them?

If you are sure about your spark plugs, it surely is a coil pack. 100%. If your spark plug does not give a spark, but the coil is good, and you don't replace the plug, it will ruin the coil. And even ...
Arturs Bolsunovskis's user avatar
2 votes
Accepted

Can an ignition coil melt-down?

If you can get spark from the wire, but not the plug, I'd suggest a bad plug (I'm sure you're already there). I'm thinking the coil may be getting hot due to your method of inciting the spark ... I'd ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
2 votes

Ignition coil overheating: what to blame?

Had this a long time ago when some car ignition systems (Alpine, Solara, Horizon) which had ballast resistors in the supply to give 9v (which were bypassed for starting with 12v) - when a 9v coil was ...
Solar Mike's user avatar
  • 34.7k
2 votes
Accepted

What creates resistance in ignition coils?

The primary winding has several hundred turns of copper wire of a given thickness and the length and thickness contribute to the resistance (proportional to the length and inversely proportional to ...
Solar Mike's user avatar
  • 34.7k

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