Hyundai Sonata Misfire - Diagnosis
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Date: 2020-08-05
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Comments and reviews: 10
RC
Reminds me of the old days. We would wrap electric tape around the wires and drive it that way till payday, then go buy new wires. In the good ole days thats exactly how mechanics tested a spark plug wire, pull them one by one till you found the one that was acting up. As soon as you said after market plug wires I knew what it was. I myself have replaced several cheap sets of wires. You sell yourself short as far as your knowledge, seriously you do great on finding issues. I personally dont rely on test equipment all the time. Old school is still the best method on some things. When it comes to trouble shooting your modern electronics it still boils down to the basics. Dont sell yourself short, ever. You are doing great and as far as being scientific, thats a laugh. Science is still just an educated guess. I learned that years ago.
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Reminds me of the old days. We would wrap electric tape around the wires and drive it that way till payday, then go buy new wires. In the good ole days thats exactly how mechanics tested a spark plug wire, pull them one by one till you found the one that was acting up. As soon as you said after market plug wires I knew what it was. I myself have replaced several cheap sets of wires. You sell yourself short as far as your knowledge, seriously you do great on finding issues. I personally dont rely on test equipment all the time. Old school is still the best method on some things. When it comes to trouble shooting your modern electronics it still boils down to the basics. Dont sell yourself short, ever. You are doing great and as far as being scientific, thats a laugh. Science is still just an educated guess. I learned that years ago.
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Jan
Maybe you could have done with turning on the Peak Detect function for this test. With any of these digital displays of waveforms, you have to keep in mind you're looking at a graphical representation of a series of numbers, taken at discrete intervals, depending on your time base setting and screen resolution, from an even larger number of values which are actually being sampled and held at the A/D converter. In this manner, it's quite easy for your display to step over the actual peak value from the coil just before the spark occurs.
By turning on the Peak Detect function, internally, the scope continually flags the highest voltage measured over the time period between two pixels on the screen, so, even though it might turn your trace more fuzzy, you should get a more consistent read-out of the spark threshold voltage.
reply
Maybe you could have done with turning on the Peak Detect function for this test. With any of these digital displays of waveforms, you have to keep in mind you're looking at a graphical representation of a series of numbers, taken at discrete intervals, depending on your time base setting and screen resolution, from an even larger number of values which are actually being sampled and held at the A/D converter. In this manner, it's quite easy for your display to step over the actual peak value from the coil just before the spark occurs.
By turning on the Peak Detect function, internally, the scope continually flags the highest voltage measured over the time period between two pixels on the screen, so, even though it might turn your trace more fuzzy, you should get a more consistent read-out of the spark threshold voltage.
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talkntribe
anyone familiar with Hyundai Sonatas. I bought a 06 sonata v6 3. 3 96k miles from a neighbor for 2k. vehicle now has 105k. and I'm starting to experience oil loss. every day I check the levels. no sign of oil leaking anywhere around engine or floor.
my wife drove to work one day and it was fine. go to come home and engine shook, check light came on. shut off the car and it was about 1qt low. this happened to me back in September. only it took 2. 5 quarts. filled it back up and got oil change.
seems like every 4k miles this crap happens. is it normal to burn oil this fast. to have the engine shake on a quart low seems off. sometimes wonder if dipstick is giving wrong readings.
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anyone familiar with Hyundai Sonatas. I bought a 06 sonata v6 3. 3 96k miles from a neighbor for 2k. vehicle now has 105k. and I'm starting to experience oil loss. every day I check the levels. no sign of oil leaking anywhere around engine or floor.
my wife drove to work one day and it was fine. go to come home and engine shook, check light came on. shut off the car and it was about 1qt low. this happened to me back in September. only it took 2. 5 quarts. filled it back up and got oil change.
seems like every 4k miles this crap happens. is it normal to burn oil this fast. to have the engine shake on a quart low seems off. sometimes wonder if dipstick is giving wrong readings.
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Luke
Lets remember, 1st of all great job. I'm old and remember Toyotas that cheap plugs wires were put on without the insulating ring at the end of the spark plug wire, then check your gap and old plugs. Then the ones that get you are hairline carbon tracks. Then it was cold starts dropping that cylinder. For ugly intermittent problems try a bit of power braking then things happen quickly. Thank you young man I don't watch tv anymore, Your thought process and experience really shows in the way you process in the thought, Okay what's the why of it all. Lets do some more of this(:
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Lets remember, 1st of all great job. I'm old and remember Toyotas that cheap plugs wires were put on without the insulating ring at the end of the spark plug wire, then check your gap and old plugs. Then the ones that get you are hairline carbon tracks. Then it was cold starts dropping that cylinder. For ugly intermittent problems try a bit of power braking then things happen quickly. Thank you young man I don't watch tv anymore, Your thought process and experience really shows in the way you process in the thought, Okay what's the why of it all. Lets do some more of this(:
reply
Jim
eric o I got a 2007 Hyundai entroung 3. 8 and am about to pull my hair out on this van. it got a p0300 and p016 codes and I have install a cam sensor and even swap them from the rear to the front and swap out a the crank sensor and had my friend check it and said 4 and 5 coils where misfiring and so I changed 1 3 5 so I dient have to keep removing the pleum and its still getting the p0300 I wish I live closer but am stuck here in maine lived in conn. let me know what u think
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eric o I got a 2007 Hyundai entroung 3. 8 and am about to pull my hair out on this van. it got a p0300 and p016 codes and I have install a cam sensor and even swap them from the rear to the front and swap out a the crank sensor and had my friend check it and said 4 and 5 coils where misfiring and so I changed 1 3 5 so I dient have to keep removing the pleum and its still getting the p0300 I wish I live closer but am stuck here in maine lived in conn. let me know what u think
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Fred
A good plug and a good new boot with sufficient and proper dielectric grease should eliminate this happening. One point to remember is that a really sharp edge on the spring or the clip that snaps onto the plug can concentrate the HV field and cause a local breakdown which could eat the rubber. One more reason for using copious dielectric grease. It's not just a lubricant. It seals out water AND it stops those tiny discharges at sharp points.
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A good plug and a good new boot with sufficient and proper dielectric grease should eliminate this happening. One point to remember is that a really sharp edge on the spring or the clip that snaps onto the plug can concentrate the HV field and cause a local breakdown which could eat the rubber. One more reason for using copious dielectric grease. It's not just a lubricant. It seals out water AND it stops those tiny discharges at sharp points.
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thomas
My sonata has five cylinders misfiring due to the engine design flaw in the rain. Fixing it and then selling it. Thank God I only paid 800 for it. My car looks mint and has been kept up meticulously by the original owner and the Hyundai dealer would only give them 750 at trade in for a brand new one. Why? Cuz Hyundai knows they have frequent problems in the rain and wet.
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My sonata has five cylinders misfiring due to the engine design flaw in the rain. Fixing it and then selling it. Thank God I only paid 800 for it. My car looks mint and has been kept up meticulously by the original owner and the Hyundai dealer would only give them 750 at trade in for a brand new one. Why? Cuz Hyundai knows they have frequent problems in the rain and wet.
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Bart
When you disconnect the injector, I think you will see the lean cylinder difference on the scope if you power brake the vehicle. The firing line will slope upward. At idle it may be able to sniff some fuel from the manifold and other cylinders, but won't keep up under load. The secondary miss will show up better if you power brake it as well. Nice videos.
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When you disconnect the injector, I think you will see the lean cylinder difference on the scope if you power brake the vehicle. The firing line will slope upward. At idle it may be able to sniff some fuel from the manifold and other cylinders, but won't keep up under load. The secondary miss will show up better if you power brake it as well. Nice videos.
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ThePeavey23
hey Eric, I am a fan of your work an knowledge. I need some work done to my truck. I have a big oil leak an can't find it. The truck is a f150 with a efi 302. Was wondering a good way to spot a oil leak an if I can't find it an fix it, could I maybe make a appointment for you to look an fix it? Thx so much for the videos!
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hey Eric, I am a fan of your work an knowledge. I need some work done to my truck. I have a big oil leak an can't find it. The truck is a f150 with a efi 302. Was wondering a good way to spot a oil leak an if I can't find it an fix it, could I maybe make a appointment for you to look an fix it? Thx so much for the videos!
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rhkips
Reading ignition waveforms is super-easy! Just look at the peak kV, average it by the inverse of the decay rate per millisecond of the initial oscillation, then replace the engine and bill the customer. ;)
Great video, Eric! You're far more brave than I am to be handling plug wires with a known leakage path.
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Reading ignition waveforms is super-easy! Just look at the peak kV, average it by the inverse of the decay rate per millisecond of the initial oscillation, then replace the engine and bill the customer. ;)
Great video, Eric! You're far more brave than I am to be handling plug wires with a known leakage path.
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