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Wavy ide

stsanford
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stsanford Member

stsanford

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Posted

I had my bettery die on me, so I happened to have an Energizer left over from my '98 986. I popped it in, but the car had been without power for probably 3-4 days.

Initial startup was strong, the idle was rough for 30-40 seconds, with the car almost stalling out once. ( I instinctively blipped the gas, so I don't know if it would have).

Car is driving fine, have put approx 12 miles on it since the battery terminals have had juice, but now it's developed a wavy idle.

Should I be concerned? Maybe I should get a new battery afterall... The Voltmeter is showing a tick under 14 when underway, right at 12 when key is at position I.

I should add that I did just recently have difficulty with the MAF, codes P1128 and P1129 and just replaced the MAF and air filter. The car's got 32K on it and is due for a change of spark plugs I think (I am the 3rd owner, and it looks like they were changed at 25K but that was 2 years ago.)

I have a link to a sound recording of the idle, sorry for the quality, made it with my PDA... Current Idle Sound

Thanks in advance,

Scott

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Loren Member

Loren

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Put some more miles on it driving normally. If the battery has been disconnected for longer than about 5 minutes the DME must relearn it's idle and power functions. If it doesn't smooth out I would likely look for carbon build up in the throttle body and idle bypass valve first.

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stsanford Member

stsanford

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Loren,

Car is idling well now. What a great treat this car is! Truly amazing, I haven't driven it for over 2 weeks and I'm so thrilled to have had the privledge again today.

Thanks so much for your help and your board!

Edited by stsanford
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