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Old 02-18-2013, 02:56 PM
ccd1977 ccd1977 is offline
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Default High RPM at idle

First, thank you all for your help with my new RAM. I good thinks going on and your guidance has made all the difference.

ok, new issue I noticed the other day. I have a 2000 Dodge Ram 1500 4x4 with the 5.9l engine. I just installed a Spectre CIA and has the stock exhuast replumbed by removing the CAT and straight piping it to a VX series muffler.

I noticed though that the truck would idle high at around 1400 RPMs first start and then about 10-15 seconds later slowly drop to abotu 1k RPMs

I disconnected the positive terminal for 2 hours to reset the computer just in case. Still kept doing it. Any ideas?

Thanks in advance.
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Old 02-18-2013, 03:23 PM
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Vacuum leak. A scan tool capable of displaying live sensor data can confirm this. If the IAC counts are at or near 0, then you know you have a leak, assuming nobody has messed with the base idle on the throttle body.
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Old 02-18-2013, 04:38 PM
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is this a free service from like an auto parts store or do I need a mechanic for this?
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Old 02-18-2013, 04:53 PM
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You'll need at the very least access to a scan tool that's capable of reading the data stream. I can't speak for what local parts stores in your area use.
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Old 02-18-2013, 04:56 PM
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also, I have no code. Would this matter?
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Old 02-19-2013, 03:01 PM
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No. Older OBD systems aren't as good at detecting vacuum leaks like the newer stuff.
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Old 02-28-2013, 12:59 PM
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You might have to get your hands dirty and just visually check all the vacuum lines. You can check them by spraying carb cleaner on the lines. When you spray a line listen for the idle to increase. If it increases, that line has a leak. I don't know how much trouble the IAC valve causes on these trucks, but I have to remove and clean my IAC valve on my neon once per year. You might check to make sure there is no gunk or foreign objects preventing it from closing. Also, check that there is nothing preventing the throttle from closing. I had a field mouse make himself at home in my airbox once. He managed to wedge a stick that prevent my throttle from closing all the way.
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Old 03-06-2013, 01:25 AM
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Sounds like a failing O2 sensor to me. Would also rule out aforementioned vacuum leaks as well. Keep in mind that when the intake manifold plenum gasket fails, that's a big vacuum leak also.
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