Jerking during acceleration and the radio goes on the fritz

thebeardedone · **December 01, 2018, 11:53:51**

So I've had my 2012 FD for almost a year now. Recently the car started jerking during acceleration and the radio goes on the fritz.

It felt like the car was misfiring, so I took it in to Hyundai, they checked it out an said there was just a loose connector. I drove it home from the dealership and it was fine for that trip and the radio behaved itself as well.

The next I left to go to work and the problem was back. The past day or so the car also seems to idle a little rough and it feels like the power just isn't there anymore.

The radio works fine on FM and AM but I switch to USB, it reads the drive, plays the song for a few seconds and then goes back to FM, then detects there's a ub drive and repeats the process. Almost like the radio is rebooting.

So I'm just wondering if anyone else has a similar issue. I think it might be the battery nearing the end of its life but I won't be sure before I take it to a battery place as you could drive a new car straight from the dealership to them and they'd still tell you that you need a new battery

tw2005 · **Reply #1: December 01, 2018, 12:00:10**

What USB device are you plugging in?

The Gonz · **Reply #2: December 01, 2018, 13:08:30**

The symptoms tell me there's still a better job needed on that loose connector.

nzenigma · **Reply #3: December 01, 2018, 20:52:11**

Quote from: The Gonz on December 01, 2018, 13:08:30

The symptoms tell me there's still a better job needed on that loose connector.

Punt from afar, its connection of battery +ve or -ve, or a chassis earth link. Car is running on alternator supply volts.

thebeardedone · **Reply #4: December 06, 2018, 08:31:29**

Update

I took the car in, turns out the coil packs were bad and they were arching. This was also responsible for radio crapping out.

And thanks for taking an interesting/making suggestions, everyone.

thebeardedone · **Reply #5: December 06, 2018, 08:33:22**

16GB flash drive. I've heard many say that this can be a problem but there's less than 2GB of data on it ands I've been using it for almost a year with no issues. I posted an update on this thread explaining the issue

nzenigma · **Reply #6: December 06, 2018, 20:42:36**

Thanks for your report, much appreciated

Coil failure is fairly rare, the arcing also creates a broadband signal that dominates anything your radio is trying receive,

tw2005 · **Reply #7: December 06, 2018, 21:15:40**

Interesting resolution, I was more interested in the Radio frizt thinking maybe a USB HDD was connected overloading the 5v supply.

Dud coilpacks and RF interference was not on my mind

The Gonz · **Reply #8: December 13, 2018, 09:22:09**

I'm with you, Gerard. Coil packs make perfect sense for the symptoms but are further down the fault finding list.