Motor Vehicle Maintenance & Repair Stack Exchange
Motor Vehicle Maintenance & Repair Stack Exchange

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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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, while the other actually fires at the top of…
Poisson Fish
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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 without connecting it to the vehicle it was…
Adam Davis
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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 no spark. I put in a new cam sensor, crank sensor,…
Shaine
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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 wiring harness resistance all the way back to the…
Rick Gostlin
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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 hood and the dip stick was not fastened, and oil was…
Kieran
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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 wondering if the ratio of the primary to…
Robert S. Barnes
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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 spark plugs in the head. As can be imagined this…
Dalton D
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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 fine and will run fine while driving. seems to…
tyler mackenzie
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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 correct resistance numbers with the system off,…
Robert S. Barnes
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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 output" VMS for about $50. For the first two it's not…
Robert S. Barnes
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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, each one servicing two cylinders I assume.
Robert S. Barnes
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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. What could be the problem? Please help thanks
Ricardo
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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 know, should I change all of the coils? What…
Deborah Reid
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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 to pick it up, and to bring ti back if there was…
AnaruNZ
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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 high engine temps. My starter died and I…
Stegathesaurus
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