rough idle after disconnecting and reconnecting battery

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rough idle after disconnecting and reconnecting battery

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Hyundai >> Vehicle Line Up >> Hyundai Accent >> rough idle after disconnecting and reconnecting battery

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rough idle after disconnecting and reconnecting battery - 1/25/2008 2:13:42 PM

jassmith

Posts: 9
Joined: 7/14/2007
Status: offline

Hi,

1999 accent GLS.

I disconnected the battery negative terminal for around 5 minutes. After reconnection the car has now begun to idle roughly. It's starts without a problem and there is no loss of power at high speeds but whenever I have to stop at lights etc.the engine rpms drop momentarily (with the headlamps dimming for a split second) and then increase and remain steady (although the engine sounds as if it's about to stall). I never had this problem prior to disconnecting and reconnecting the battery.

Is there any way I could have damaged the alternator?

All suggestions welcome>

Thanks

Post #: 1

RE: rough idle after disconnecting and reconnecting bat... - 1/25/2008 4:03:52 PM

Night_Shifter

Posts: 4
Joined: 1/24/2008
From: Japan
Status: offline

Hmm maybe it just bad connections, You could clean it by usign a metal wire brush and clean off the terminals. And make sure it bolted on good also.

(in reply to jassmith)

Post #: 2

RE: rough idle after disconnecting and reconnecting bat... - 1/25/2008 8:26:04 PM

fintile

Posts: 25
Joined: 4/16/2006
Status: offline

Ditto...check to make sure the connection is good. If the lights are dimming its got something to do with the power.

(in reply to Night_Shifter)

Post #: 3

RE: rough idle after disconnecting and reconnecting bat... - 1/28/2008 10:16:26 AM

jassmith

Posts: 9
Joined: 7/14/2007
Status: offline

Thanks for the replies.

Could be the battery terminal connection alright.

Someone else suggested that the ECU would have been reset after the battery was disconnected so the car would need to be driven at various rpms so that the ECU could re-learn the correct settings?

Does that sound logical?

The problem seems to have corrected itself since I've been drving the car over the past few days.

(in reply to fintile)

Post #: 4

RE: rough idle after disconnecting and reconnecting bat... - 3/1/2008 4:17:00 PM

J..M

Posts: 4
Status: offline

They need a little time to re-learn things ....... Its normal

Disconecting the batt resets the ECU ...... Panick Ye Not

(in reply to jassmith)

Post #: 5