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Old 05-29-2008, 21:05   #1 (permalink)
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Lightbulb Cold IDLE speed

HI,
After knowing and talking to atleast 3 people whose SOHC engines got damaged under 100K, I discovered that all of these damages happened at cold start or startup after a while. Now, when I have rebuilt my engine and car is dong good, I noticed that these engines go really high speed during cold start (3000 RPM at times) and that could be the reason for breaking the valve seat.

CAN ANYONE SUGGEST if IDLING SPEED at Startup can be reduced.????
This might reduce the chances of damage to valves/head/engine.
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Old 12-29-2008, 09:43   #2 (permalink)
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Re: Cold IDLE speed

Not a chance.

Your idle speed is completely controlled by the ECU via the Idle Air Control motor (or valve depending on what book you are reading).

These are generally a stepper motor connected to a bypass valve that allows air to bypass the throttle plate and increase the idle. The ECU will open the IAC as much as is necessary to achieve the desired idle.

No adjustment is available.

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