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Diagnose COP Ignition with a scope and a Wyzeprobe
Why is the Vehicle Engine Misfiring?
When you encounter a rough running engine caused by a misfire, one of the best ways to quickly find out what is causing the motor to miss is to scope test the ignition system.
In this article we will discuss what ignition patterns look like when there is a lack of fuel causing the misfire.
Ignition waveform characteristics of a lean misfire.
Let’s first look at a good coil on plug ignition waveform pattern.
Notice in the above known good coil on plug secondary waveform that the Spark Line also called the Burn Line is relatively flat-with upward slope starting at about 75% of the total burn time and has a small nose at the end. The Burn Time equals the length of the Spark Line, and it’s duration should be about 1.1 milliseconds to about 1.5ms long.
Rarely will you be able to detect a lean misfire while scope testing just at idle, you are best off to place the engine under a slight load, or perform multiple light snap throttle events while viewing your scope.
Here is a screen capture during a slightly lean condition.
Notice how as the air-fuel mixture in the cylinder is leaning out that the height of the nose rises, the nose gets a lot larger and that the upward slope of the spark line is starting at about 60% across the total burn time. Another thing that is happening during this lean condition is the total burn time is getting shorter, if you compare both images above.
Here is what an extremely lean ignition pattern looks like.
When the air/fuel ratio is extremely lean as in the image above, the spark line slope is starting it’s upward slope almost immediately. The spark line slope and length (in time) plays a huge role in oscilloscope diagnostics of engine performance issues.
The Wyzeprobe coil-on-plug-probe was used to capture the ignition patterns from a 2008 Honda Fit 1.5L engine.
Filed under: Automotive Diagnostics Tagged: coil on plug ignition pattern, cop ignition test probe, Honda Fit Ignition, lean ignition pattern, wyze probe
10 Reasons To Hire A Mechanic Rather Than DIY
Car repairs affect people every day. One common misconception about auto problems is that they are easy to spot and fix. Truth be told, even when you think you know what is wrong with your car, it is best to have a mechanic take a look to make sure that the correct diagnosis is made, the problems are fixed correctly, and there is no other damage to the surrounding parts. Though it may seem like a better financial move at the time, fixing your car without the know-how of an auto mechanic may not end up with that result. There are many reasons why you should always have a mechanic inspect and repair your car- here are ten that will make you think twice about DIY.
1. Your time- Mechanics have the proper equipment to fix your car in a short amount of time. You may save money on labor by doing the job yourself, but finding the time to do in a day what most mechanics can do in a few hours will come at the cost of your sanity (fixing cars at home is stressful) and your time off.
2. Your wallet- Once again, saving on labor costs can seem great, but the damage that can be done to other parts, even small things such as accidentally stripping a screw or bolt can make for some seriously expensive extra fixes.
3. Guarantees- when you fix your car yourself, there is no guarantee or warrantee on the service. Mechanics will often give you a guarantee on the work in the case that something was done incorrectly or a part does not work properly.
4. Your safety- A poorly installed new part may be more hazardous to your safety than the old, broken part you were replacing in the first place.
5. Their tools- Mechanics have the proper tools such as lifts, special wrenches, and air compressors. Jobs can be difficult and dangerous to complete without the proper set up.
6. Correct diagnosis- you may think that your brake pads need to be changed, but after spending time and money to repair them, you find out it was the brake rotor all along- wasted time and money that a mechanic could have saved with a correct initial diagnosis.
7. Hazardous materials- doing your own oil change at home can be a pain. Where do you dispose of the old oil and fluids, and how much will that cost? Auto mechanics know how to deal with hazardous chemical waste- and by going to them, it won’t be sitting around in your garage.
8. Convenience- DIY repairs could end up taking DAYS for the inexperienced at home mechanic. Many garages and mechanics will let you make use of a “lender” so you can get your family where they need to be while the job is done.
9. Parts- Acquiring the proper parts to fix your car can be difficult. Many places do not sell directly to the public and the places that do could take days to get the part you need.
10. Hidden problems- mechanics will be able to spot issues with the car that you didn’t know were there- saving you a surprise in the long run.
Auto Repairs Ottawa is a local car repair and maintenance shop in the heart of the nations capital. Contact us today to get a free quote on your next repair or maintenance job!
Very True
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How to find coil on plug misfires
Here is a good write-up about diagnosing and fixing COP Ignition Problems.
Read more here http://wyzeprobe.wordpress.com/2015/06/03/how-to-quickly-test-coil-on-plug-ignition-missfires/
The Fastest Way to Test COP Ignition Systems = Wyze Probe
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