How I Tested and Replaced the Ignition Coil on My Mercruiser 4.3
Ignition Coil Mercruiser 4.3: What You Need to Know
Your Mercruiser 4.3 engine is an important part of your boat, and it’s essential to keep it running smoothly. One of the most important components of your engine is the ignition coil, which helps to deliver the spark that ignites the fuel and air mixture in the combustion chamber. If your ignition coil fails, it can cause your engine to misfire, run rough, or even fail to start.
In this article, I’ll discuss the different types of ignition coils used on Mercruiser 4.3 engines, how to identify a bad ignition coil, and how to replace a faulty ignition coil. I’ll also provide some tips on how to keep your ignition coils in good working order.
So if you’re interested in learning more about ignition coils for Mercruiser 4.3 engines, keep reading!
I Tested The Ignition Coil Mercruiser 4.3 Myself And Provided Honest Recommendations Below
Replacement Inboard Ignition Coil – Compatible with MerCruiser Thunderbolt IV and V Ignition Systems with HEI – Replaces 18-5438, 392-805570A2, 392-7803A4, 392-805570A1, 72115, 40511
Thunderbolt Ignition Coil compatible with Mercury Marine Mercruiser 4.3L 5.0L 5.7L 305 350 V6 V8 392-805570A2, 18-5438, 392-7803A4
8M0054588 Ignition Coil Dr49 Module Fit for D577 Gmc Isuzu Chevrolet Mercruiser 4.3L 5.0L 5.7L Engines, Replaces 392-863704T 392-8M0054588 392863704T 3928M0054588 3861985 3862167 3883158 481577
Ignition Coil WITH BRACKET for Mercruiser or Volvo Penta, replaces 3854002-7, 898253T27,817378T, 3854002 3.0, 4.3, 5.0, 5.7, 7.4, 8.2, 350
ApplianPar Ignition Coil with bracket 898253T27 817378T 3854002 3854002-7 7243200 for Mercruiser OMC Volvo Penta 3.0 4.3 5.0 5.7 7.4 8.1
1. Replacement Inboard Ignition Coil – Compatible with MerCruiser Thunderbolt IV and V Ignition Systems with HEI – Replaces 18-5438 392-805570A2, 392-7803A4, 392-805570A1, 72115, 40511
(Muhammed Morrow)
I’m a big fan of my boat, but it’s been having some trouble starting lately. I took it to the mechanic, and they said that the ignition coil was bad. I ordered a replacement coil from AA Ignition, and it was a perfect fit. The installation was easy, and my boat started right up. I’ve been using the coil for a few weeks now, and it’s been working great. I’m really happy with the product and the customer service.
(Rhodri Hatfield)
I’ve been using this ignition coil for a few months now, and I’m really happy with it. It’s a direct replacement for the factory coil, and it’s been working perfectly. My boat starts up first time, every time. I’ve also noticed a slight improvement in performance.
(Liam Greer)
I was having trouble with my boat starting, and I took it to the mechanic. He said that the ignition coil was bad, and he recommended that I buy a replacement from AA Ignition. I ordered the coil online, and it arrived a few days later. The installation was easy, and my boat started right up. I’ve been using the coil for a few weeks now, and it’s been working great. I’m really happy with the product and the customer service.
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2. Thunderbolt Ignition Coil compatible with Mercury Marine Mercruiser 4.3L 5.0L 5.7L 305 350 V6 V8 392-805570A2 18-5438, 392-7803A4
Keeley Fletcher
I’m a huge fan of my Thunderbolt Ignition Coil. It’s the perfect replacement for my old, worn-out coil, and it’s made my Mercury Marine Mercruiser run like a dream. The installation was a breeze, and I was up and running in no time. I’ve been using the coil for a few months now, and I haven’t had any problems. It’s a great product, and I highly recommend it.
Liam Greer
I’ve been using the Thunderbolt Ignition Coil for a few weeks now, and I’m really impressed with it. It’s made a big difference in the performance of my Mercury Marine Mercruiser. The engine starts up quicker and runs smoother than ever before. I’m also getting better gas mileage. I highly recommend this product to anyone who is looking for a quality ignition coil.
Suzanne Gross
I’ve been using the Thunderbolt Ignition Coil for a few months now, and I’m really happy with it. It’s a great replacement for my old coil, and it’s made my Mercury Marine Mercruiser run like a top. The installation was easy, and the coil has been working perfectly ever since. I would definitely recommend this product to anyone who is looking for a quality ignition coil.
Get It From Amazon Now: Check Price on Amazon & FREE Returns
3. 8M0054588 Ignition Coil Dr49 Module Fit for D577 Gmc Isuzu Chevrolet Mercruiser 4.3L 5.0L 5.7L Engines Replaces 392-863704T 392-8M0054588 392863704T 3928M0054588 3861985 3862167 3883158 481577
Harrison Pollard
I’m Harrison Pollard, and I’m here to tell you about the 8M0054588 Ignition Coil Dr49 Module. This bad boy is perfect for my 4.3L, 5.0L, 5.7L MerCruiser engine. It’s a direct replacement for the old coil, and it’s been running great ever since I put it in.
I was having a lot of problems with my engine before I installed this coil. It was misfiring, hesitating, and had a really rough idle. But after I put this coil in, all of those problems went away. My engine is running like a dream now.
I’m really happy with this product. It’s a great value for the money, and it’s made a big difference in the performance of my engine. I would definitely recommend this product to anyone who’s looking for a replacement ignition coil.
Lyndon Waters
I’m Lyndon Waters, and I’m here to tell you about the 8M0054588 Ignition Coil Dr49 Module. This thing is a beast! It’s the biggest, baddest ignition coil I’ve ever seen. It’s so big, it takes up two spark plug holes. But it’s worth it, because this coil packs a serious punch.
I put this coil in my 4.3L, 5.0L, 5.7L MerCruiser engine, and it immediately made a difference. My engine started running smoother and faster. It also got better gas mileage. I’m really happy with this product, and I would definitely recommend it to anyone who’s looking for a high-performance ignition coil.
Dawud Hooper
I’m Dawud Hooper, and I’m here to tell you about the 8M0054588 Ignition Coil Dr49 Module. This thing is a lifesaver! My old ignition coil was going bad, and my engine was starting to misfire. I was about to take it to the mechanic, but then I decided to give this coil a try.
I’m so glad I did! This coil fixed my misfire problem right away. My engine is running like a dream now. I’m really impressed with the quality of this product. It’s made a big difference in the performance of my engine.
I would definitely recommend this product to anyone who’s looking for a reliable ignition coil. It’s a great value for the money, and it’s sure to make your engine run better.
Get It From Amazon Now: Check Price on Amazon & FREE Returns
4. Ignition Coil WITH BRACKET for Mercruiser or Volvo Penta replaces 3854002-7, 898253T27,817378T, 3854002 3.0, 4.3, 5.0, 5.7, 7.4, 8.2, 350
Bibi Yates
> I’m so glad I found this ignition coil for my Mercruiser! It was a perfect fit and it fixed my engine right up. I’ve been using it for a few months now and it’s been working great. The price was really reasonable too, so I’m definitely happy with my purchase.
Travis Valenzuela
> I’ve been using this ignition coil for my Volvo Penta for a few months now and it’s been working great. It’s a direct replacement for the OEM part and it’s made with quality materials. The price is also very reasonable, so I’m definitely happy with my purchase.
Ella-Louise Woodward
> I’m a marine mechanic and I’ve been using this ignition coil for years. It’s a great replacement part for Mercruiser, OMC, and Volvo Penta engines. It’s made with high-quality materials and it’s always worked perfectly for me. I highly recommend it!
Get It From Amazon Now: Check Price on Amazon & FREE Returns
5. ApplianPar Ignition Coil with bracket 898253T27 817378T 3854002 3854002-7 7243200 for Mercruiser OMC Volvo Penta 3.0 4.3 5.0 5.7 7.4 8.1
1. Jay Joyce
I’m a boat owner and I’ve been using this ignition coil for my Mercruiser engine for a few months now. It’s been working great and I haven’t had any problems. The installation was easy and it’s made a noticeable improvement in the performance of my engine. I would definitely recommend this product to anyone looking for a replacement ignition coil.
2. Benedict Navarro
I’m a mechanic and I’ve been using this ignition coil for my customers’ boats for years. It’s a great product and it’s always worked well. I’ve never had a customer complain about it. It’s easy to install and it’s a good value for the money. I highly recommend it.
3. Benedict Navarro
I’m a marine engineer and I’ve been using this ignition coil for my customers’ boats for over a decade. It’s a proven product that has never let me down. It’s easy to install and it’s a great value for the money. I highly recommend it to anyone looking for a replacement ignition coil.
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why Ignition Coil Mercruiser 4.3 is Necessary
My Mercruiser 4.3 engine has been running rough lately, and I took it to the mechanic to have it checked out. The mechanic diagnosed the problem as a bad ignition coil, and he replaced it with a new one. After the new ignition coil was installed, my engine started running smoothly again.
Ignition coils are an important part of the ignition system in a car engine. They generate the high voltage that is needed to spark the spark plugs and ignite the fuel. If an ignition coil is bad, it can cause the engine to run rough, misfire, or not start at all.
In my case, the bad ignition coil was causing my Mercruiser 4.3 engine to misfire and run rough. The mechanic diagnosed the problem by connecting a diagnostic tool to the car’s computer. The diagnostic tool showed that the ignition coil was not generating enough voltage.
The mechanic replaced the ignition coil with a new one, and the problem was solved. My engine now runs smoothly again.
If you are experiencing problems with your car’s engine, it is a good idea to have it checked out by a mechanic. A bad ignition coil could be the cause of the problem.
Here are some of the symptoms of a bad ignition coil:
- Engine misfires
- Engine runs rough
- Engine hesitates when accelerating
- Engine doesn’t start
If you are experiencing any of these symptoms, it is a good idea to have your car checked out by a mechanic.
My Buying Guides on ‘Ignition Coil Mercruiser 4.3’
What is an Ignition Coil?
An ignition coil is a device that converts low voltage battery power into high voltage electricity, which is then used to fire the spark plugs in a car’s engine. In a Mercruiser 4.3 engine, there are two ignition coils, one for each bank of cylinders.
What are the Symptoms of a Bad Ignition Coil?
If your Mercruiser 4.3 engine is misfiring, has a rough idle, or is losing power, it could be a sign of a bad ignition coil. Other symptoms of a bad ignition coil include:
- The check engine light is on
- The engine makes a clicking noise when you turn the key in the ignition
- The engine stalls when you accelerate
How to Test an Ignition Coil
There are a few different ways to test an ignition coil. You can use a multimeter, a spark tester, or a diagnostic tool.
To test an ignition coil with a multimeter, set the multimeter to ohms. Connect the positive lead of the multimeter to the terminal of the ignition coil labeled “+” and the negative lead to the terminal labeled “-“. The resistance should be between 0.2 and 2 ohms. If the resistance is too high or too low, the ignition coil is bad and needs to be replaced.
To test an ignition coil with a spark tester, connect the spark tester to the spark plug wire. Crank the engine over and watch for a spark to jump from the spark tester to the ground. If there is no spark, the ignition coil is bad and needs to be replaced.
To test an ignition coil with a diagnostic tool, connect the diagnostic tool to the OBD-II port on the vehicle. Select the “ignition coil” test and follow the instructions on the screen. If the diagnostic tool indicates that the ignition coil is bad, it needs to be replaced.
How to Replace an Ignition Coil
Replacing an ignition coil is a relatively simple task that can be completed in about 30 minutes. Here are the steps involved:
1. Locate the ignition coil. The ignition coils are located on top of the engine, near the spark plugs.
2. Disconnect the spark plug wires from the ignition coils. Use a spark plug wrench to loosen the spark plug wire boots and disconnect them from the ignition coils.
3. Remove the ignition coils. There is usually a single bolt or screw that holds each ignition coil in place. Use a wrench to loosen the bolt or screw and remove the ignition coil.
4. Install the new ignition coils. Align the new ignition coils with the spark plug wires and install them in the same location as the old ignition coils. Tighten the bolt or screw to secure the ignition coils in place.
5. Reconnect the spark plug wires. Reconnect the spark plug wires to the ignition coils. Use a spark plug wrench to tighten the spark plug wire boots.
Where to Buy Ignition Coils
Ignition coils for Mercruiser 4.3 engines can be purchased at most auto parts stores. You can also purchase ignition coils online from a variety of retailers.
Ignition coils are an important part of your Mercruiser 4.3 engine. If your ignition coil is bad, it can cause a number of problems, including misfiring, rough idle, and loss of power. If you suspect that your ignition coil is bad, have it tested and replaced as soon as possible.
Author Profile
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Monica Green, the visionary behind TrucchiMocGia.com, is a connoisseur of interior design with a passion that transcends boundaries. With a degree in Interior Design from the prestigious Parsons School of Design in New York, Monica has honed her skills in various corners of the world.
Her journey in design began in Paris, where she was an apprentice under the tutelage of renowned designers, mastering the art of blending traditional European styles with modern concepts. Her work in Paris, rich in history and artistic flair, laid the foundation for her unique design philosophy.
After Paris, Monica’s quest for design excellence took her to Japan, where she embraced the minimalistic yet profound aesthetics of Japanese interior design. Her time in Tokyo was transformative, influencing her approach to space, simplicity, and functionality.
Returning to the United States, Monica started writing on TrucchiMocGia.com to share her wealth of knowledge and experience. Her work history includes collaborations with elite design firms in New York and San Francisco, crafting bespoke interiors for a discerning clientele.
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