Questions tagged [ignition-coil]

A component of the ignition system that, by induction, creates the high voltage required by the spark plugs.

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13 votes
2 answers
17k views

Why the wasted spark in four-stroke motors?

This just came up in my curious mind. In a typical four-stroke engine with an even number of cylinders, spark plugs fire in pairs. This means there is a wasted spark as one cylinder is in exhaust, ...
Poisson Fish's user avatar
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11 votes
2 answers
568 views

What vehicle does this ancient ignition coil fit?

My Father-in-Law gave this Ford branded ignition coil to me today. I'm curious to know what vehicle it went to, and how it was hooked up originally. Can I easily determine whether it works or not ...
Adam Davis's user avatar
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10 votes
3 answers
33k views

Remanufactured 5.3 engine not firing on one bank

2007 Chevy Avalanche 5.3 vin 3. I bought a remanufactured engine. After installing it, the truck runs, but only bank 1 (1,3,5,7) is firing. It has power to the coil packs on bank 2 (2,4,6,8), but ...
Shaine's user avatar
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9 votes
1 answer
841 views

Do these coil on plug waveforms suggest I have a bad engine controller?

I have a missfire on cylinder 3. I have swapped the coil from cylinder 6 and 3, but the missfire remains on cylinder 3. I have also done the following: - replaced all spark plugs. - checked the ...
Rick Gostlin's user avatar
7 votes
5 answers
3k views

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

An inductive ignition coil is basically a step up transformer, in which the ratio of windings between the primary coil and secondary coil determines how much the primary voltage is multiplied by. I am ...
Robert S. Barnes's user avatar
7 votes
5 answers
2k views

Engine shakes, from bad oil change

I got an oil change awhile back, I notice my car idling a little more. Where I park for work it was hard to tell what the oil leak was coming from on the ground. I don't know much, but I popped my ...
Kieran's user avatar
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6 votes
4 answers
7k views

How to Test an Ignition Coil with a Multimeter

I have a 98 Mazda 626 GF and I'd like to test the ignition coils with a multimeter to see if any of them are starting to fail. The car has ECU controlled timing / ignition and there are two coils, ...
Robert S. Barnes's user avatar
6 votes
1 answer
912 views

How Common are Voltage Drop Problems?

After watching this video on voltage drop, it makes me feel like testing the resistance of various sensors and accessories with my multi-meter isn't really a reliable test of anything, since I can see ...
Robert S. Barnes's user avatar
6 votes
1 answer
3k views

Yamaha Seca - Motorcycle Idle problems

My motorcycle (1982 Yamaha Seca 650) has had a strange problem with the idle for a few years now. I have not been able to diagnose it and I'm hoping that someone here might be able to help. It starts ...
tyler mackenzie's user avatar
6 votes
3 answers
9k views

Honda CB400 Super-Four - Power Issue

I have a Honda CB400 Super-Four. My bike starts and rides but I can't get more than 5000rpm out of her. If I do then she floods and cuts out. Two of her exhaust pipes are cold and two are warm. ...
Ricardo's user avatar
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6 votes
1 answer
4k views

Are There any Benefits to a High Voltage Coil Pack?

I'm considering replacing the coil pack on my 98 mazda 626 GF 2L, and am looking at a standard replacement at about $15, a standard replacement with 10 year warranty for about $21, and a "high ...
Robert S. Barnes's user avatar
6 votes
1 answer
2k views

Can Getting Fuel Injectors or Ignition Coils Wet Ruin Them?

I have a 2005 Suzuki Forenza Wagon where I recently cleaned the engine compartment. I was a little careless during the cleaning and water got in under the spark plug wires to sit around the top of the ...
Dalton D's user avatar
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5 votes
1 answer
2k views

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

My nephew changed my spark plugs and coils. I have a 2011 Buick Regal and one of the spark plugs blew when I started it, so he removed it and replaced it with an old Prius spark plug. I would like to ...
Deborah Reid's user avatar
5 votes
4 answers
5k views

Engine not starting after melted Ignition Coil

Car: 2004 Honda CRV-EX (the moonroof one) Miles: 220k~ Issue: I had cylinder misfires before on this car and they were fixed with new sparkplugs and ignition coils. Recently I've had more misfires and ...
Stegathesaurus's user avatar
5 votes
2 answers
29k views

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

Most recent gasoline cars have a direct ignition, also called coil on plug, system where each spark plug has its own ignition coil. Before that, cars used a common ignition coil for all cylinders. ...
juhist's user avatar
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5 votes
2 answers
54k views

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

I have a 2002 E39 520i. One of the cylinders has stopped working (or misfiring) and I am hoping it is because no spark is generated. I am very new to engines so bare with me please. :) My question is:...
Balázs Vincze's user avatar
5 votes
1 answer
595 views

Can swapping ignition coils fix a cylinder four misfire?

My car was having power issues so I took it to the mechanic who said cylinder 4 was misfiring. He came back to me and said he swapped the ignition coils over and rescanned with no misfires and told me ...
AnaruNZ's user avatar
  • 53
5 votes
1 answer
11k views

Ignition coil overheating: what to blame?

I have got in the past ignition coil overheating, making the engine run very erratically and in some cases it even wouldn't run at all until the coil got cooler. In one occasion I changed the coil for ...
Aram Alvarez's user avatar
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5 votes
2 answers
3k views

My 2008 Hyunai Accent is misfiring on two cylinders, bad gas?

Update: So I went full steam ahead today. Got the new valve cover gasket ($20.99 at AutoZone), unscrewed all the 10mm bolts, pried the cover off, hey! No obvious breaks in the seal! Well, that's good ...
jlehenbauer's user avatar
5 votes
2 answers
21k views

Do I have a bad ignition coil? Measurements inside

I'm troubleshooting what I believe is an engine misfire on my LS1 Chevy and want to rule out if I have bad ignition coils. In order to do this I took out the ignition coils and measured the ...
Zaid's user avatar
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4 votes
3 answers
7k views

How is ignition coil feedback useful?

Today I learnt that some engine management setups demand a feedback signal from the ignition coil. What does it do with the signal though? Is it just for diagnostics?
Zaid's user avatar
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4 votes
1 answer
17k views

Do I Need to Ground the Spark Plug When Testing

When I'm using a known good spark plug to test spark at each wire, do I need to ground the threads of the plug to the engine block like the guy in this video is doing? What happens if I don't ground ...
Robert S. Barnes's user avatar
4 votes
1 answer
2k views

What is a vibrator on a Model T ignition coil for?

In this post here What vehicle does this ancient ignition coil fit? there is a device that is cited in @paulster2's response that is called a 'vibrator'. Here's the diagram from his answer where it ...
DucatiKiller's user avatar
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4 votes
1 answer
8k views

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

I'm having ignition problems with my car (1985 Suzuki Samurai). Sometimes the engine will die randomly while driving, and often when warm it will have problem starting. I bought a new ignition coil, ...
JamesB's user avatar
  • 51
4 votes
1 answer
1k views

Engine Turns but won't start

It's an old Renault 4-cylinder carburetor engine in a boat. I don't know much about engines so let me know if I'm not including important information. The boat is old but new to me. I drove it for ...
Peter's user avatar
  • 213
4 votes
1 answer
86 views

Coil On Plug, Testing The Primary Coil

Are there any alternatives for scoping the primary coil on a COP system other than using a low amp probe? I'm guessing backprobing doesn't work since the ignition control module is built into the coil ...
Ben's user avatar
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4 votes
2 answers
10k views

Coil popped out of head

I've got a 1999 F250-SD XLT 4×4 that the coil just popped out of the head what would cause that? I've not done anything to it yet
Cameron's user avatar
  • 121
4 votes
1 answer
1k views

Can an ignition coil melt-down?

I'm having trouble with a John Deere 210 Lawn & Garden Tractor. I mowed happily for an hour in the morning, then it quit on me after five minutes of mowing in the afternoon. No noises, just died;...
anonymous2's user avatar
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4 votes
1 answer
2k views

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

I was asked to look at a Lexus ES330. The complaint was the car wouldn't go over 20MPH and would fall on it's face. The ECM was replaced and problem persisted. One coil was replaced around a year ...
Ben's user avatar
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4 votes
1 answer
256 views

What Is The Output Voltage For The Mazda 626 GF 2L 98-2002 Coil Pack?

I've seen aftermarket "high voltage" coils that output 40kV, but what is the output voltage for the standard OEM coil pack? I want to use a spark tester with an adjustable gap to check the strength ...
Robert S. Barnes's user avatar
4 votes
1 answer
2k views

Frequent spark plug change

I have a Hyundai Tucson , 2008 model. About 20 months ago while my wife was driving the car, some smoke come out and she stopped the car and they tow it. (She doesn't remember white or black smoke) ...
TGG's user avatar
  • 213
4 votes
1 answer
340 views

Why would the same ignition coil fail 4 times in my 2012, 5.3 Silverado?

The first one failed at around 90K miles, the second around 130000K, the third around 165000 and again this week at 167000K. I've changed spark plugs and plug wires. Always the same cylinder and the ...
Mike M.'s user avatar
  • 41
3 votes
3 answers
763 views

Can I replace my ignition coil with a ECU?

Can I take the ignition coil out of my 1965 dodge challenger and replace it with a ECU? If I can, how will I go about doing it? Can it be a simple replacements?
LostPecti's user avatar
  • 1,691
3 votes
1 answer
282 views

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

I am replacing all of the ignition coils in my MK5 Golf as they keep they have all started to fail recently as per this question I have managed to change them with the exception of 1 and 2 because I ...
AWGIS's user avatar
  • 77
3 votes
1 answer
3k views

Cooling the ignition coil

I had an old 64 Fairlane that died in rush hour traffic one day. I called a buddy who worked near me-- he pulled up to the side of the road with a bag of ice, and held it to the ignition coil. The ...
user101289's user avatar
3 votes
2 answers
3k views

Are ignition coils easy to replace on a BMW 318i 2.0L 2007 msport model?

They'll cost me £21.06 each. I watched a video on YouTube that showed a guy clipping of the engine cover and pulling out and plugging in the coils. I'm not 100% sure what BMW model this was but it ...
LondonGuy's user avatar
  • 145
3 votes
2 answers
2k views

Pin out for Bosch ignition coil (Part No# 12131712219)?

Does anyone have any information on this particular Bosch ignition coil for BMW. The part no. is 12131712219. Tried googling it but was couldn't find much info. I would be really grateful if anyone ...
The_Vintage_Collector's user avatar
3 votes
1 answer
540 views

How does the ignition system control the Energy of the spark?

An automotive ignition system needs to provide a specific amount of energy to properly ignite the air/fuel mixture in the combustion chamber. Energy = voltage * amperage * duration. A specific ...
Robert S. Barnes's user avatar
3 votes
1 answer
148 views

Do spark plugs need changing if one ignition coil cable broke

A friend of mine had one of their ignition coil snap in half, which meant one cylinder wasn't firing. She drove for approximately for 10km, before getting back home and finding out what was wrong. We ...
Horag's user avatar
  • 31
3 votes
2 answers
348 views

Diagnosing a boat that wont start

Having some problems with my '92 Boston Whaler Rage jet-boat again.... See this post for all relevant boat info: Starting a 2 stroke jet boat after several years Ok, so I did basic troubleshooting, ...
Calvin's user avatar
  • 489
3 votes
1 answer
43 views

ignition lead replacement

I drive a 1998 Ford Falcon AU with 210,000 km on the clock with original 18-year-old ignition leads. I only drive about 10,000 km per year. The car runs perfectly. Should I replace them? PS. I replace ...
Robin Curtis's user avatar
3 votes
1 answer
1k views

Nissan Altima catalytic converter ruined twice in one month

My 2005 4-cylinder 2.5s Nissan Altima has been having major issues for the past several months. My mechanic replaced the catalytic converter and a month later another mechanic said that the catalytic ...
user19864's user avatar
3 votes
2 answers
252 views

2002 Saab 93 SE Ignition Coil - Fluid found inside, engine rumbling

I had a new coil installed 6 months ago in my 2002 Saab 93 SE and it has been running fine until the other day when the engine started rumbling quite violently. Took it to a garage and after they ...
ignitioncoil's user avatar
2 votes
2 answers
831 views

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

I am trying to find out if I have one spark plug (#3 to be exact) as well as the coil can I change just the one or is it bad for the engine to do so?
Pamilton's user avatar
2 votes
1 answer
331 views

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

I have a misfire on cylinder 1 unyet i have 4 great sparks with ignition timing and valve timing checked. I'm clutching at straws i know, but is it possible to have a long reaching spark bridging 20mm ...
Michael Sherpa's user avatar
2 votes
3 answers
6k views

Motorcycle misfires

I own a 1990 Suzuki GSXR 750, I, bought the bike about a month ago. The first time I took the bike out for a ride I noticed that when you accelerate hard and the engine is at high revs it feels as if ...
Monique Rossouw's user avatar
2 votes
1 answer
3k views

Misfire in single cylinder 4 stroke engine

I am having Apache RTR 180. Tech Specs:- Displacement: 177.4 cc Cylinder arrangement: Single Maximum Power: 12.52 kW (17.03 bhp) @8500 rpm Maximum Torque: 15.5 Nm @ 6500 rpm Bore x Stroke: 62....
NANDAKUMAR THANGAVELU's user avatar
2 votes
1 answer
94 views

Car shakes since replaced spark plugs

I have a 2011 Lincoln MKZ and I just replaced the spark plugs and now the car shakes and Im getting a obd reading P0351- Ignition Coil A primary/secondary circuit P0113- Intake Air Temp Sensor 1 ...
Amanda Loers's user avatar
2 votes
2 answers
1k views

Starter grinding on flywheel only when ignition system is connected

I have a boat with a 1990 GM 305 in it. Last year I replaced my computer controlled ignition system with a basic HEI / distributor based ignition system. Everything worked great for the entire boating ...
Ryan Griffith's user avatar
2 votes
1 answer
7k views

Testing a motorcycle ignition coil and spark plug

Here is an image for reference: I am attempting to test this ignition coil and spark plug. How do I go about connecting this to its corresponding 6v battery to get it to fire. As well I will be ...
Tyler B. Joudrey's user avatar