How To Change Idle Speed?
06-05-2011, 11:43 AM
#3
Drifting
If you have idle problems then you likely have a dirty throttle body or an intake air leak.
Why do you feel you need to adjust it?
BTW... the DME should keep it constant 700 RPM + or - 40 RPM (no AC).
Why do you feel you need to adjust it?
BTW... the DME should keep it constant 700 RPM + or - 40 RPM (no AC).
06-05-2011, 11:53 AM
#4
Rennlist Member
100plus,
Your first post comes on a Sunday morning at sunrise here in the Eastern USA. The Western USA folks won't be up for hours. And it is Sunday morning... patience. I'm guessing 90% of Rennlisters are in the USA, and your best technical responders won't be looking in here until much later today.
However, that being said, Loren has given you the best possible response.
Your first post comes on a Sunday morning at sunrise here in the Eastern USA. The Western USA folks won't be up for hours. And it is Sunday morning... patience. I'm guessing 90% of Rennlisters are in the USA, and your best technical responders won't be looking in here until much later today.
However, that being said, Loren has given you the best possible response.
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06-06-2011, 09:09 AM
#9
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100plus,
Your first post comes on a Sunday morning at sunrise here in the Eastern USA. The Western USA folks won't be up for hours. And it is Sunday morning... patience. I'm guessing 90% of Rennlisters are in the USA, and your best technical responders won't be looking in here until much later today.
However, that being said, Loren has given you the best possible response.
Your first post comes on a Sunday morning at sunrise here in the Eastern USA. The Western USA folks won't be up for hours. And it is Sunday morning... patience. I'm guessing 90% of Rennlisters are in the USA, and your best technical responders won't be looking in here until much later today.
However, that being said, Loren has given you the best possible response.
06-06-2011, 10:03 AM
#11
Rennlist Member
That is correct. You cannot adjust your idle manually. It is all done by the programming in the ECU. Two basic RPM settings are preset by the factory to keep the car running at idle with the A/C running (slightly higher RPM) and without the A/C running. The actual fuel flow depends on the dozens of factors monitored (ambient air temp, engine temp, barometric pressure, humidity, fuel quality, etc etc) The RPMS are selected not only to keep the engine running at idle with the two basic loads (A/C, no A/C) but to meet emission requirements for idle speeds.
You still haven't explained why you would want to do so.
If you have a manual transmission and have modified the flywheel to a lighter item, you probably need to have your ECU flashed with a program designed for that.
Keep in mind that the 1999 Carrera 2 was the last 996 to have an actual cable running from the gas pedal to the engine. Everything else is fly-by-wire after that.
You still haven't explained why you would want to do so.
If you have a manual transmission and have modified the flywheel to a lighter item, you probably need to have your ECU flashed with a program designed for that.
Keep in mind that the 1999 Carrera 2 was the last 996 to have an actual cable running from the gas pedal to the engine. Everything else is fly-by-wire after that.
06-06-2011, 02:17 PM
#12
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That is correct. You cannot adjust your idle manually. It is all done by the programming in the ECU. Two basic RPM settings are preset by the factory to keep the car running at idle with the A/C running (slightly higher RPM) and without the A/C running. The actual fuel flow depends on the dozens of factors monitored (ambient air temp, engine temp, barometric pressure, humidity, fuel quality, etc etc) The RPMS are selected not only to keep the engine running at idle with the two basic loads (A/C, no A/C) but to meet emission requirements for idle speeds.
You still haven't explained why you would want to do so.
If you have a manual transmission and have modified the flywheel to a lighter item, you probably need to have your ECU flashed with a program designed for that.
Keep in mind that the 1999 Carrera 2 was the last 996 to have an actual cable running from the gas pedal to the engine. Everything else is fly-by-wire after that.
You still haven't explained why you would want to do so.
If you have a manual transmission and have modified the flywheel to a lighter item, you probably need to have your ECU flashed with a program designed for that.
Keep in mind that the 1999 Carrera 2 was the last 996 to have an actual cable running from the gas pedal to the engine. Everything else is fly-by-wire after that.
No particular reason. Just felt like pushing up the Rpms to 900. Nicer idle sound? Haha. Anyway thanks for the info! Now I know I cannot manually adjust it ...
02-25-2017, 08:19 AM
#13
Rennlist Member
On the cable drive, the idle speed is controlled by the idle air control valve, engine timing, and engine computer. Not the throttle plate.
The way to change this is to hack the DME. I wouldn't.
The way to change this is to hack the DME. I wouldn't.
