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Discussion Starter · #1 · (Edited)
Per my introduction about just getting this '20 VT and starting maintenance...I'm having my CEL coming on frequently.

I bought my car about 6 weeks ago with 32K miles on it. About a week after I got it, it had the CEL with misfires on random, 2 and 4. However the car seems to be running great.
It did that 2 times (both random, 2 and 4 ) after my first week, and I noticed that when it triggers, it happens right after I start the car , let it warm up until rpms go down and drove out of my driveway (screen pops up with maintenance issue, and scanner shows misfire only right after I drive off). The fist time this happened, I drove it for about 10 days with the CEL on, and history on scanner showed no other misfires. So, I've cleared 2 CEL's in the first 3 weeks I had it.

Last week, I went 1 whole week without CEL (driving every day), so I decided NOT to change my plugs (already purchased and ready to swap out). Per dealer, plugs are not warranty items, but coils are. So the plan was to change my plugs, and if it popped up again, take it to the dealer for warranty work.

Then, after not driving car for 2 days over the weekend, I got CEL again this morning right after pulling out. I let car warm up for a minute, it went down to it's regular 750 rpms, but I did not sit an extra minute...now thinking I should give it 2 mins. Then, on my 30 mile drive to work I got a record 39mpg WITH THE AC ON! So, car is running great, but this CEL is a thorn on my display.

I'm going to scan it now that I'm at work and reset it, but any ideas? Is this normal? Should I just let it warm up another minute, or should I change the plugs?

Thanks

Edit: Ok, after a minute of thought, I realize I was spoiled by my last car that I never let warm up , and probably should give the oil some time to circulate...prob gonna just let it warm up more. But still wondering what other people are doing. Other threads suggesting you do not let car warm up are confusing.
 

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Discussion Starter · #7 ·
@trdtoy I have the recommended NGK plugs and will check the gap too, if I change them. I also thought it might be the fuel, as after I bought the car I ran a full tank with no CEL, then I put 93 in it and got the 2 CEL's. Then I went back to 87, and ran for a week with no CEL. But now that it happened again, making me wonder what's going on. No mods or tune on car. Car is running good still, so will probably do what @misnblu suggested here if CEL hits again (swap coils), then maybe change plugs. I'm also giving it an extra 30 seconds to 1 min to warm up in the morning (after the rpm's go down). Good info on 2/4 strokes, that makes sense.
 

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Discussion Starter · #9 ·
@trdtoy Ok.I am the 2nd owner, and the car is just over a year old. The carfax shows the car was only taken to the dealer for regular oil changes with no other issues cited. It is an assumption that it has not been tuned. How can I check that?

When I got out of work yesterday, I was letting the car warm up an extra 30 seconds to 1 min, and the CEL triggered again , while I was sitting. So I am guessing it just takes a min for the CEL to trigger after the car starts up (not a warm up issue). When I got home I scanned fault logs and it shows 300 301 302 and 304. Most of the codes have been 300 302 and 304, so I went ahead and swapped coils 1/3 with 2/4. Car is still running good. No CEL on my way to work or driving around last night for 45 mins (to make sure my coil swap was good). I will look forward to the next CEL codes.
 

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Discussion Starter · #11 ·
@trdtoy I bought the ODBScan LX dongle and have just been clearing the fault codes, so it doesn't show any history. When I bought the car it had a history of about 1000 miles before I bought it of a seatbelt sensor and airbag sensor (I'm guessing that was something triggered while at the dealer). Other than that I don't think it shows me a history. Whenever CEL triggers for misfires, it seems to be once every 400 or 800 miles.

On 2nd day after reset and no CEL. I filled up with 89 (station had 86, 89 and 93)...car running great. So it leaves me to wonder how even the dealer might find the issue if it is an intermittent CEL.

My main concern is passing inspection next year. I think there is something in the 'puter that prevents inspection after CEL reset, right? So if this thing is triggering every week or 2, that may be an issue. May end up having to leave it at dealer for a 3 or 4 weeks for them to figure it out (which will suuuuuk).
 

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Discussion Starter · #13 ·
@trdtoy Ok, thanks for all the detailed information. I will look for detailed cylinder history. I looked before I reset it last time but did not see it, I will look again next time.

And, I did not have to wait long...I think it is more like every 200-400 miles it is actually tripping CEL. Yesterday , again about 2 mins after it started it showed random, 2 and 4. So, this weekend I will change spark plugs. If it triggers again after that....it will probably sit at dealer for warranty service for a few weeks/months. Last time I was there they were on 2 month appointments for service calls.
 

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Discussion Starter · #17 ·
@trdtoy Update: I bought the full version of torque, yeah it looks a little nicer. I changed my plugs over the weekend, drove it for about an hour, no problems. In fact it (maybe it was just me since I changed the plugs), it purred noticeably smooth. Then the next day as soon as it warmed up and the revs went down, I waited about 20 seconds, moved it out of the garage and the CEL triggered again. Again with 300 (random) 302 (cyl 2 ) and 304 (cyl 4). Trying to reach dealer today.

Wondering if there is anyway I can get it to pass inspection next year without having the dealer work on it, but it should still be under warranty so going to prob let them take a stab at it.
 

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Discussion Starter · #18 ·
Well....took it the dealer yesterday to have them diagnose it. Also yesterday it was still running great, got 39 MPG on my 40 min commute. It's such a great car. Just wish this CEL thing would go away.
They said it will take 1 to 2 week just to have someone diagnose it.
 

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Discussion Starter · #20 ·
@trdtoy Been a week, have not heard back from dealer yet. They said 1 to 2 weeks...so still waiting. In the mean time, read through the "misfire" thread for any other ideas. Trying to figure out my options.

Also a bit concerned about dealer because when I took it in they said something like "We have to look at it , not sure it will be covered since you didn't buy it from us". What? It is still under factory warranty. How could this not be covered? Also, they are going to charge me $150 for diagnostics. I even emailed the general manager (partly to document the issue, partly to see if he had any customer response).....no response from the GM save that he talked to the service person I am working with and she was not happy about that. I tried to explain to her my intentions for emailing and that I just want my car fixed, but she was not happy about that. Seems like the GM came down on her or something. Now just hoping to get my car back without additional damage if they can't fix it.

So now I'm looking at worst case scenario...having to sell the car if they refuse to fix it as warranty issue. Looking for another car is NOT easy. This is a really great car and I still love it. With the 200hp on a 1.6L getting almost 40mpg....it really hits a sweet spot. Not sure what else I can do since I don't want to risk not being able to get it inspected due to this continuing CEL . I don't have many options, here is what I have come up with;

1) Hope dealer can fix CEL issue (not holding my breath).
2) Sell car (should get about 75%-90% of my $$ back in this sellers market. Best replacement looks like a Honda Civic Sport Touring...but not super excited about getting a Honda again.
3) File Lemon Law case against dealer. Hate to get to this point, and don't expect much to come out of it. But since when do factory warranties not apply just because you are the 2nd owner?
4) Keep car and hope I can get CEL to go away after oil changes/more investigation/etc. This seems a bit over my head as I have already done the immediate things of swapping coils and changing plugs.
 

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Discussion Starter · #23 ·
Ok, so IF the car was mod'd, and the dealer refuses to fix car, THEN I should sue the dealership that sold it to me under the pretense of having an extended warranty. Otherwise, it sounds like Hyundai should honor the warranty and fix the CEL.

Yeah, I don't mind spending a little, but I just spent all my savings getting the car, and then some to do the work on my own.

One more question (maybe for @trdtoy ), I noticed that my car has the conical air filter on it (like in your avatar pic) , but did not think much of it when purchasing. Not being very familiar with these cars, is that stock or did someone remove the airbox and replace it? Maybe that is causing the misfires?
 

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Discussion Starter · #26 ·
Update.

So, dealer said they have been looking at my car for about a week (had it there for 3 weeks now). They said aftermarket air intake may void warranty, the service alerts have been going off way before I bought the car, and that I cannot file a lemon law against other dealership I bought it from, since lemon law only applies to original dealerships.

Hoping they can still fix car, but may have to get a lawyer to settle this with the place I bought it from.

Good times.
 

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Discussion Starter · #27 ·
Soooo...looks like the OG dealership I bought it from is going to help. But the Hyundai dealership says they need to replace the cold air intake with factory before they can determine what's causing the misfires. So...car now 4 1/2 weeks at dealership, will be another week or 2 to get the parts....rerun diagnostics.......yawn....
 

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Discussion Starter · #30 ·
...after my last update they told me the had no idea when they could get the last part in they need to reinstall the factory airbox. So...I was able to get my car back , just 2 days under sitting at the dealer for 9 weeks. The turbo did make a strange sound, kind of high pitched grinding whistle while driving back home, but then went away. The good news is it's running great. After 6 days of driving, no CEL. I expect it to come back on any day now...but so far so good.

I still need to get the cold air intake replaced to get car into warrantable condition. Any offers on a used cold air intake system?
 

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Discussion Starter · #32 ·
Getting the oem intake for a gen 2 is not an issue so not sure why they're having issues. Getting new or used in a week or less should be the norm.
I called the other dealer that is close to me. They said parts lead times are 2-6 weeks. The dealer I had it at did not order parts until car was there 2 or 3 weeks, so that's part of the delay. I'm giving them another 3 weeks and will call them at the start of the new year. Car's still running great with no CEL. Maybe it fixed itself? :)
 

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Discussion Starter · #36 ·
@DragonSlave02 For sure. They make some $$ off parts. After 3 months of working with them, I think they know my story by now, so I can't pull that on them. I already asked them about getting the parts for them and they seemed very off put by that suggestion. I didn't assume all the dealers had their parts in a central database, so I was going to go shopping for them. I was told they do have a centralized parts distribution system.

Fortunately, since I bought the car as "under factory warranty", the dealer I bought it from is paying to get the OEM airbox back on. And, after a week of driving , still no CEL !!
So, no big rush. Just glad I still don't have my car over there sitting in their parking lot.
 
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