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2013 VT Engine Misfire. PLEASE HEAR ME OUT!!

28K views 15 replies 9 participants last post by  AndroidiOSWP  
#1 ·
Hello All,

My name is Corey and I am a bit new to these Forums so bear with me. I know there are threads after threads in this Forum regarding Engine misfires, etc. cause I have read MANY of them after my recent experience. So if you will, please hear out my situation, as I feel it is a bit of a unique one and would love to get as much input as possible.

So, It all began about 2 weeks ago. On my way home from work, on the freeway, I stepped on the gas (about 90%) and boom, BIG hesitation and a couple sounds that I could only describe as an engine backfire. Along with that, my Check Engine Light flashed for about 10 sec. and then disappeared. Not thinking much of it, I shook it off as a weird fluke.

Then, a couple days later, my wife used the car to take my daughter to school. She brought it back to me with a fully illuminating check engine light and she explained that the car felt very weird (More hesitation, and backfires). I have since forgiven her ;) . That night, I took my car over to the nearest Auto Parts store to use their OBD tool. Plugged it into my car, and viola, Misfire in Cylinder 4. Devastated, because I love my little VT, I took it to the Dealer the very next morning (FYI, I'm at 68,000 miles and was very worried about what would be hitting my wallet).



So, above is my Service Log. After having my car all day, they called me and told me that they feel like it may be my fuel pump. BUT, they insisted that I get a new battery, because as you can see by the battery test results on the right, my battery was measuring at 284CCA instead of the 550. They said, once I get a new battery they would test the fuel pump again to see if fixed the problem. Again, as you can see in the Service notes, my Fuel Pump was putting out 579 PSI at 1600 RPMs instead of the required 1000+ PSI.

So they explained, if they replaced the battery, retested the fuel pump and it still was shorting the PSIs then it was a bad fuel pump. And of course, low and behold, at 68,000 miles, that is not covered under the 100,000 mile Powertrain warranty, resulting in a Service bill of near $1,000 on a car that I still consider New!! Anyway, I said no way, I cant believe that, so I picked up my car. They cleared the CEL and has yet to come back on since driving it. It still drives completely fine, but, I do "test" it from time to time and sure enough, as soon as a little extra pressure is applied to the gas pedal, hesitation occurs, but no CEL as of yet. So here I am, pleading to the Forum Geniuses that know a whole lot more about our Vehicles than I do.

I guess, all this comes down to a few questions.

1. What would you do in my situation?
2. Can a weak battery REALLY cause my Fuel Pump to come up short on PSIs? And if so, do you believe a new battery could fix this problem?
3. Do you think it is worth Calling Hyundai about this, see if they could pull some strings and get this covered under warranty?

Please, if its not too much to ask, any help or guidance would be GREATLY appreciated!!
Thank you to those that read through my sob story :)
 
#2 ·
When you were first describing your problem it sounded like a collapsing fuel line to me. I had that occur a few times on my '13 VT and the flashing check engine light and loss of power were the same as yours. Shortly after I experienced this problem there was a service bulletin released regarding replacing the original fuel line with one that is supposedly more sturdy. I have not seen the issue since. A faulty fuel line would also make sense for why you are having low output from your HPFP.

For your battery, are you still using the original? I have heard that some people only get 40,000 miles out of the original battery. I would probably take the car to a local auto parts store and have them test the battery and see if they confirm that it's going bad. Replacing a battery yourself will be significantly cheaper than having the dealer do it and sometimes auto parts stores will even do it for you.

Good luck with your problem(s) and hopefully this helps a little bit.
 
#6 ·
It does apply to yours. It even applies to the 2014 as well whether or not Hyundai admits it. You can do one of two things. Either buy a new fuel line from a 2015 VT or buy an aftermarket one from 6th Element Engineering. The chances of your HPFP going out at only 68k miles is extremely slim.
 
#7 ·
Im surprised in their diagnostics, they didn't just connect an external battery to see if the fuel pressure didn't rise. I would also look at the fuel lines. they tend to move around because our motor mounts are soft.
 
#9 ·
Yeah you know, I thought the same thing a couple days later... Why didn't they just connect a battery themselves in order to get the proper testing accomplished.

I used to work in the Automotive industry for 5 years and am pretty aware of what goes on in the background, which is why I am very weary of dealerships and their operations.

Now... If I were to buy a new fuel line, is this something that is DIY? Are there any possible links anyone could link me to? I feel like now that I'm at 68,000 miles, I am on my own, unless I wanna drop some serious dough at the Dealer..

Thank you all for your advise this far!
 
#10 ·
#11 ·
I had a mis-fire problem a couple weeks ago.

IMO, it's one of 3 things or a combination of the three:

- Bad spark plug
- bad coil pack
- fuel line

Since you said your having the bad mis-fire, I'm ruling out the fuel line. A bad fuel line is usually a really hard cut, maybe one or two hesitations. A flashing CEL mis-fire trigger would be faster mis-fire sounds.
As this is what I had, I changed the plugs and I still got the really bad sputtering and flashing CEL.

I took the car to the dealer and told them I thought it was coil packs. Low and behold, I had 2 bad ones. I'd suggest that to them.

Having a new fuel line that won't fail would be peace of mind at this point.
 
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#12 ·
HPFP high pressure fuel pump. cam driven in the engine compartment.
LPFP low pressure fuel pump. electric motor driven in the fuel tank.

Just to clarify, the dealer checked the HPFP pressure but only to diagnose the performance of the LPFP in the gas tank. The LPFP in the gas tank is electrically driven while the HPFP under the hood is mechanically driven. The assumption being a low pressure at the HPFP is possibly due to a lack of adequate fuel being delivered from the LPFP (the gas tank). And, that is why the discussion is centering around the fuel line and it (fuel line) being the culprit.

***
 
#13 ·
I agree, its either a bad coil pack, spark plugs, or fuel line. I would lean more towards the ignition as the fuel line issue does not cause a flashing CEL in my experience. Pop those plugs out and look for broken ceramic on the tip.
 
#14 ·
Hey guys... Just an update to this thread. Took the spark plugs out today, check em out. They are in order from Cylinders 1-4 (left to right) ... Check out number 3, there is a very visible crack in the porcelain (another smaller crack on the opposite side that isn't visible in the picture)... Just so happens cynlinder 3 is where my misfire was.

Being that its New Years Day, my local dealership is closed, so I will be heading down there tomorrow to pick up a new set. Really hoping this fixes my problem, and thanks again for all your guys help!
 

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#15 ·
#1 looks like the insulator is broken also