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#1
01-27-2008, 03:15 PM
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Too fast idle
Hi all. Have a 93 DD 3.9l. It idels too high 1000rpm's at park and warmup. Have replaced plugs wires pcv..How do i adjust this Fast idle cam to lower the idle RPM?. If im NOT supposed to do that what do I do?
Thanks 
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#2
01-28-2008, 10:22 AM
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Re: Too fast idle
A slightly higher idle speed is normal after a cold start...1000 to 1200 rpms is the typical range. Once the ECM senses a rising engine temperature, it will gradually reduce throttle to normal idle speed.
If the truck is ALWAYS starting up idling high regardless of temperature then I would check your engine temp sensor.
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