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Engine lugs when coming to a stop.

j3w
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j3w Member

j3w

Posted
Posted

I have been trying to figure this out for a while now, to no avail. Perhaps someone here can help?

When I am coming to a stop in my 2004 S, in the last 10 feet or so as I come to a complete stop the engine idle falls to 400 RPM, for a second or so. The car shudders, the idle picks up and everything is fine. I have a foot on the brake and am slowing like at a traffic light or something.

Has anyone noticed this?

j3w Member

j3w

Posted
  • Author
Posted

I have been trying to figure this out for a while now, to no avail. Perhaps someone here can help?

When I am coming to a stop in my 2004 S, in the last 10 feet or so as I come to a complete stop the engine idle falls to 400 RPM, for a second or so. The car shudders, the idle picks up and everything is fine. I have a foot on the brake and am slowing like at a traffic light or something.

Has anyone noticed this?

Just rephrased my search and found a thread.

Sorry for the clutter.

  • 2 months later...
Reaction1 Member

Reaction1

Posted
Posted

Engine Mounts!! Porsche dealers are clueless! I just had engine mounts replaced and the problem is solved. No more reverberation when coming to a complete stop. The hydraulic mounts settled about one inch, without leaking. Replace transmission mount while you're at it. It is complicated and should be done at a shop.

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RFM Member

RFM

Posted
  • Moderators
Posted

Have you already cleaned the throttle body? I would start with that.

  • 4 months later...
agoodin514 Member

agoodin514

Posted
Posted

I have been trying to figure this out for a while now, to no avail. Perhaps someone here can help?

When I am coming to a stop in my 2004 S, in the last 10 feet or so as I come to a complete stop the engine idle falls to 400 RPM, for a second or so. The car shudders, the idle picks up and everything is fine. I have a foot on the brake and am slowing like at a traffic light or something.

Has anyone noticed this?

Just rephrased my search and found a thread.

Sorry for the clutter.

were you able to resolve this? I am having the same issue with my 04 S. Was it the throttle body?

  • 1 year later...
GOB Member

GOB

Posted
Posted

I too have this "low idle problem". Is the fix new engine mounts? Is the fix cleaning the throttle body? Bad MAF? Is there a way to adjust the idle? What should be the proper idle rpm?

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