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Misfire after rear end collision

Gozar

Registered Member
Joined
Jul 26, 2011
Messages
63
Reaction score
8
Points
8
Location
Boise, ID
Genesis Model Type
Genesis G80 Sport
So New Years Eve I got rear-ended on I-35 South of Austin. I stopped, car behind me stopped, car behind him did not.
Pulled to the shoulder then to a nearby gas station when the police came to get everyone in a safer location.
As I pulled away from the shoulder I could feel an unevenness from the rear end. I lived less than a mile away so drive there and left it in the garage until the body shop was ready - rear bumper dinged well and active head rests deployed, it was a hard hit.
6 days after the accident shop was ready so I started the car, heard a loud clattering sound from the left front under the hood and the check engine light stayed on.
Put it in drive and could feel a surging, even at a dead stop with my foot on the brake, felt the same on the drive to body shop 1 1/2 miles away.
The mechanic shop they used called me today, check engine light was diagnosed as multiple cyclinder mis-fire, reset the light and has not come back. They checked axles, cv joints, all wheel alignments and everything checks - car drives great. I went over and drove it and it felt fine, they think the surging I was feeling was the misfire.
Any ideas on how a rear end collision could cause this? Purely coincidental? Should I be checking something else - fuel lines/gas tank? Car has 56,000 so still under warranty - drive it be happy and keep watching it?

It was down into the 20's and 30's the whole time it sat in the garage.
 
Do any of your local Hyundai dealers have a body shop?? I wouldn't trust anyone else to look at it.
 
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Get the local dealer to run a scan for codes.
 
Just a thought but has anybody actually put an exhaust gas analyzer on the car and verified the operation of the catalytic convertors.
 
Thanks for the input guys.

I should get the car back from the body shop (highly respected locally for body work) soon and will take it to the dealer prior to settling with the insurance company.
 
I got tapped in the back in a BMW a few years ago. It was not hard-- it only damaged the bumper trim and a tail light-- no sheet metal damage. But, that caused multiple cylinder misfires for a short period of time. It cleared itself and never came back. No clue why. Maybe it was an automatic fuel shut-off that triggered and then switched back on.
 
Could have knocked some crap loose in the fuel line thats partly clogging the filter.
 
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