How to check for a bad ignition coil in Ford Focus?
- Plug a scan tool to the OBD2 port in your Focus.
- Read the error code, for example if it says P0303, it means the cylinder number 3 is experiencing misfires.
- Turn off your Focus and let the engine cool down to prevent any burn injury.
- Remove the ignition coil from cylinder 3 and swap it with any other cylinder, for example cylinder 2. ...
Full Answer
What are the symptoms of a bad coil pack on a focus?
The check engine light is one of the most common symptoms of bad Coil Packs. More often than not, your engines computer will be able to detect bad Coil Packs in your Focus. There are several misfire related trouble codes.
What to do if your Ford coil pack is getting 12 volts?
Examine whether your ford coil pack is getting 12 volts when your engine is on, you can only examine this through the use of a multimeter. Furthermore, you should verify that it gets its signal from your control module through the use of LED light, and after that, remove your ford coil pack from the connector.
How to test a Ford coil pack with a multimeter?
How to Test a Ford Coil Pack with a Multimeter 1 Perform a test on your spark plug. This is one of the best ways to test whether your ford coil has any issue. ... 2 Resistance test. This particular test is usually done using a multimeter and a wrench set. ... 3 Switch signal test. ... 4 Conclusion. ...
What happens if your oil Pack goes bad on a Ford Focus?
A bad oil pack can make your Focus almost un-drivable. Or it may have little effect at all on the engine’s ability to run. It’ll get worse as they lose their ability to fire the spark plugs. Coil Packs take the place of the distributor and coil in older vehicles.
How to check for a bad ignition coil in Ford Focus?
What causes ignition coils to go bad in Ford Focus?
Does the ignition coil order matter?
Will a bad ignition coil throw a code?
What would cause an ignition coil not to fire?
Should I replace spark plugs with ignition coils?
Do better ignition coils increase horsepower?
See 2 more
How do you test a coil pack on a Ford Focus multimeter?
1:127:49How to Test an Ignition Coil Pack - Best Testing Procedure - YouTubeYouTubeStart of suggested clipEnd of suggested clipThat's one before you start the car and then you get grab your multimeter. Put it on DC voltage.MoreThat's one before you start the car and then you get grab your multimeter. Put it on DC voltage. Ground your black test lead and then on the connector. Side you start checking for voltage.
How do you test a Ford coil?
0:434:24How to check your ford modular coil on a 4.6- 5.4- 6.8 - YouTubeYouTubeStart of suggested clipEnd of suggested clipGo 1.9 1.8 1.9 ohms is good and then when you have a coil. That when you get one that does like thatMoreGo 1.9 1.8 1.9 ohms is good and then when you have a coil. That when you get one that does like that you get no response. That's a bad coil when you omit out and does nothing.
How do you check a coil to see if it's good?
3:275:53How to Test Ignition Coils - YouTubeYouTubeStart of suggested clipEnd of suggested clipAnd then you connect the wire directly to the spark tester which it almost looks like a test I saidMoreAnd then you connect the wire directly to the spark tester which it almost looks like a test I said we'll just. Use. This just like it was right so the wire from the coil goes to the spark tester.
What are the signs of a faulty coil?
What Are the Signs of a Faulty Ignition Coil?Loss of Power. This is one of the first symptoms of ignition coil failure. ... Check Engine Light On. ... Poor Fuel Economy. ... Backfiring. ... Misfiring Engine. ... Hard Starts and Stalling. ... Spluttering and Coughing Sounds. ... Jerking and Vibrating.
How can you tell if a Ford coil pack is bad?
Common Symptoms of a Faulty Coil PackA rough idle.An unexplainably louder-than-usual engine.A noticeable lack of power.A significant drop in RPMs while accelerating for no apparent reason.A blinking or intermittently activating check engine light.An active gas warning light when the vehicle has plenty of gasoline.More items...
How many ohms should a Ford coil have?
The haines manual says for the Coil over plug that the Primary resistance should be 0.55 ohms and the secondary resistance should be 5,500 ohms. To test it disconnect the electrical connector from the coil assembly and connect an ohmmeter across the primary (+) terminal and the negative terminal.
How do you check a coil with a bad multimeter?
Connect the multimeter to the negative and positive terminals of the ignition coil to get a primary circuit reading. If the multimeter shows a reading of 0 ohms, the ignition coil has shorted and needs replacing.
How do you check if a coil is firing?
If you suspect the coil is dead, you can also remove the coil, plug it back in, and use an ignition spark tester like OEM 25069 to determine if the coil is firing. You can also use a multimeter to test resistance.
How many ohms Should a coil read?
You should have a resistance reading of at least 3-4.5 ohms. A bad coil will show a higher reading then 3-4.5. Next, place the red or black lead from the meter to the centre of the coil , and to either one of the terminals positive or negative. You want 9500-10000 Ohms, a little less is ok but no more.
How often do ignition coils need to be replaced?
Generally speaking, coil packs last up to 5 years or 120,000 miles before they require replacement. Coil packs will last a long time but their continued exposure to heat and friction can naturally wear them down.
How much does it cost to fix coil?
Table of ContentsAverage Heat AC Coil Replacement CostAverage Cost$1,200Highest Cost$2,400Lowest Cost$800Jul 20, 2022
Should I replace all ignition coils at once?
No. One coil pack is for two engine cylinders, and you should only change the particular pack that is faulty. There is no way one defective coil pack is going to affect the others.
How do you test a Ford coil over plug?
0:331:44Coil on plug quick test - YouTubeYouTubeStart of suggested clipEnd of suggested clipQuick little test is use the way con : on plug adapter or a test tool. Simply bring it on when youMoreQuick little test is use the way con : on plug adapter or a test tool. Simply bring it on when you have caught on plug you lay it right on top of the coil. Simple as that you can see it firing.
How do you check a coil with a bad multimeter?
Connect the multimeter to the negative and positive terminals of the ignition coil to get a primary circuit reading. If the multimeter shows a reading of 0 ohms, the ignition coil has shorted and needs replacing.
How do I test a spark coil with a multimeter?
0:002:22Ignition Coil Primary & Secondary Resistance Testing - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo basically what you want to do is hook one of your leads of your multimeter up to this tab rightMoreSo basically what you want to do is hook one of your leads of your multimeter up to this tab right here and the other lead on the iron core. Now it should read in the specs that your manufacturer.
Can you use a multimeter to test coil?
If you suspect the coil is dead, you can also remove the coil, plug it back in, and use an ignition spark tester like OEM 25069 to determine if the coil is firing. You can also use a multimeter to test resistance.
How to tell if coil pack is bad?
Symptoms Of A Bad Ford Coil Pack. When the ignition coil pack or the spark plug wires are bad, your Ford (or Mercury, or Mazda) vehicle will display one or more of the following symptoms: The car idles rough and wants to stall (die). When you accelerate the car, it has no power. Really bad gas mileage.
What Tools Do I Need To Test The Ignition Coil?
To successfully use this information to diagnose and troubleshoot your Ford (Mercury or Mazda) four banger, you need a few specific tools. Don't worry, none of this stuff is expensive, here's the list:
What coil fires spark to cylinders 1 and 4?
One ignition coil within the coil pack fires spark to cylinders 1 and 4.
What tool to use to diagnose coil pack?
To troubleshoot and diagnose a bad coil pack on your Ford (or Mazda) car, an HEI Spark Tester is a must have tool. Using the wrong tool or method will have you chasing a wrong diagnostic test conclusion and effectively wasting your time and money.
How does each coil get its own switching signal?
As each individual ignition coil, within the ignition coil pack, get their Switching Signal, they then fire spark to two different cylinders at the exact same time (in what's known as the Waste Spark method).
How many wires does a Ford coil pack have?
The Ford coil pack connector has three wires coming out of it. No matter what the style of coil pack or the style of connector that connects to it, the circuit descriptions are the same.
Can a Ford 1.9L coil pack be tested?
This article will walk you thru' the whole diagnostic/troubleshooting process to find out what's causing your car to Misfire.
What does a bad coil pack do to a Ford Focus?
Bad Coil Packs are one of the more problematic ignition issues that can occur with the Ford Focus. A bad oil pack can make your Focus almost un-drivable. Or it may have little effect at all on the engine’s ability to run. It’ll get worse as they lose their ability to fire the spark plugs.
How to tell if coil pack is bad?
Here are the most common symptoms of bad coil packs: 1. Service Engine Soon Light . The check engine light is one of the most common symptoms of bad Coil Packs. More often than not, your engines computer will be able to detect bad Coil Packs in your Focus. There are several misfire related trouble codes. P0300 – this trouble code indicates that ...
Why is my Focus misfiring?
Misfiring is the most common symptom of bad Coil Packs. Anything else that you may feel is a result of the misfiring itself. The real question is, what is causing the misfire? There is more to your Focus’s ignition system than just the coil packs. There’s also spark plugs and plug wires.
What causes a misfire in a car?
There’s also spark plugs and plug wires. There are also non ignition related circumstances that can cause a misfire. That would include lack of fuel pressure, bad fuel injectors, or even a timing chain (or belt) that has jumped.
What happens when you hit the gas pedal on a Focus?
As you hit your Focus’s gas pedal, the fuel and ignition systems respond. If acceleration has diminished, it should be felt. The less cylinders that your engine has, the more that one cylinder not firing properly will have an effect on engine performance. If you have one or more bad Coil Packs, it’ll cause the acceleration ...
What is the trouble code for a misfire?
There are several misfire related trouble codes. P0300 – this trouble code indicates that there is a random misfire. A random misfire means is that a misfire is detected, but the ECM is not able to determine which one it is coming from, or the misfire is occurring randomly.
Why does my spark plug feel rough?
When a Spark Plug is misfiring, it is often most pronounced at idle speed. This is because when the engine turns slower, it is easier to detect . You’ll feel a rough vibration.
How to test a Ford coil pack?
To conduct it, you need first to locate the ford coil pack in your car and then take it off from the engine of your car using a wrench. Consequently, remove the large wires from the center of your ford coil, and then take the wire nuts that are retained and attach them to the side terminals of the detached ford coil pack.
How to tell if coil pack is 12 volts?
Examine whether your ford coil pack is getting 12 volts when your engine is on, you can only examine this through the use of a multimeter. Furthermore, you should verify that it gets its signal from your control module through the use of LED light, and after that, remove your ford coil pack from the connector. ...
How to reattach spark plugs before starting?
Using an insulated plier, reattach the spark plugs as you hold it in position and then use a spark tester to fit the spark plug before you start your car’s engine. When the engine is on, observe whether your spark is moving from the electrode center to your spark tester’s metal area.
What is a coil pack?
A ford coil pack is a collection of ignition coils that play the crucial role of starting your car, and are often designed to perform heavy duties. However, they still are prone to get damaged easily whenever there is vibration, poor installation, as well as excessive heat. Any time your ford coil pack starts to fail, ...
Can you test a coil pack with a multimeter?
Having read through this article, you now know of the exact steps to follow when testing a ford coil pack with a multimeter. Therefore, whenever you suspect your vehicle is experiencing any such problem, you should not rush to get a mechanic, but instead, confirm for yourself if the ford coil pack is working properly.
Can you remove the plugs on a Ford coil pack?
Moreover, the spark plug switch can guide you to remove the plugs and thereby enable you to easily access your ford coil pack . During this entire process, confirm that the wires are correctly labeled to give you an easy time during the reinstallation.
How to check for a bad ignition coil in Ford Focus?
The fastest and easiest way to check for a bad ignition coil in Focus that has check engine light on for misfire is to swap the ignition coil on the misfiring cylinder with another coil.
What causes ignition coils to go bad in Ford Focus?
Ignition coils can fail prematurely in Focus for a variety of reasons including overheating, vibration, moisture intrusion, engine oil leak, or issues with other components of the ignition system, such as bad spark plugs can cause a coil to output higher voltage than normal, significantly reducing its operating life.
Does the ignition coil order matter?
When replacing ignition coils in your Focus, it does not matter which order the coils go in or if they get switched around. But what does matter is the order of spark plug wires or connectors; with the help of the labels on the connectors, make sure each connector is hooked up to its matched cylinder. Connecting ignition coil wires in the wrong order can affect the performance of the engine or prevent it from starting, and can even result in engine damage. Mostly, due to the fixed arrangement of the connectors and wires, it is not possible to swap the connectors, even by mistake.
Will a bad ignition coil throw a code?
A faulty ignition coil can cause an engine to misfire, when this happens you may see an error code from P0300 to P0312 depending on which cylinder is experiencing misfires. Additionally, you may see error codes from P0350 to P0362, which indicates a circuit malfunction e.g. broken wires or faulty connector.
What would cause an ignition coil not to fire?
If the ignition coils are not firing properly in Focus, it can be due to a variety of reasons including defective ignition coils, malfunctioning crankshaft position sensor, bad wire in primary circuit, bad electrical connector, or faulty ECM/PCM.
Should I replace spark plugs with ignition coils?
It is a common practice to replace the spark plugs when replacing ignition coils in Focus, especially when the spark plugs have been used for some time. Worn spark plugs can cause the ignition coils to work harder, producing higher voltage than normal, which significantly reduces its operating life.
Do better ignition coils increase horsepower?
Simple answer is no, unless the existing ones in Focus are defective. Aftermarket ignition coils installed in a stock engine do not increase horsepower, or improve fuel economy, or make the engine run any smoother.
