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Old 09-16-2008, 04:08 PM   #1 (permalink)
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High RPM on Start up

2008 Crew: I live in the desert, so it is not very cold, yet when I start up the 5.7 in the morning,(78 degrees) it shoots to 1,500 rpms about 1 minute, then to 1,200 after about 2 minutes.I went up to cold country,(cold for me), and it was 46 degrees, 5.7 shot to 2,000 rpms for about 2minutes. Very long and hard for startup..anyone else having this potential problem?
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Old 09-16-2008, 04:10 PM   #2 (permalink)
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not a problem that is how the engine is designed
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Old 09-16-2008, 04:12 PM   #3 (permalink)
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It's normal. It does that to get the engine and tranny warm faster and to heat up the cats quickly for emissions standards.
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Old 09-16-2008, 06:09 PM   #4 (permalink)
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I live in Idaho and even in the afternoon when its hot my truck will do the same startup routine reving high when first started. I guess this is normal because even the trucks at the dealership do the same, and according to the dealer, its part of the warmup process for the engine and emissions system.
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Old 09-16-2008, 09:22 PM   #5 (permalink)
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Perfect answers... Great posts everyone....
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Old 09-16-2008, 09:22 PM   #6 (permalink)
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thanks mickey =-)
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Old 09-16-2008, 09:23 PM   #7 (permalink)
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You're welcome and is it cool up there yet?
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Old 09-17-2008, 01:20 PM   #8 (permalink)
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Talking Thanks to all

This site is strong because of members stepping up with no nonsense and plenty of smiles..

Thanks to everyone that responded...
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Old 09-17-2008, 05:57 PM   #9 (permalink)
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you are very welcome
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Old 09-17-2008, 06:09 PM   #10 (permalink)
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Same in Michigan's U.P.
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Old 10-26-2008, 05:44 PM   #11 (permalink)
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I don't know if I'm hurting my truck by putting it in gear immediately after starting. It does rev high and clunks when I go into drive but WTF...I'm not waiting for the revs to drop before I leave in the morning.
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Old 10-26-2008, 05:49 PM   #12 (permalink)
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Originally Posted by oilmpg View Post
I don't know if I'm hurting my truck by putting it in gear immediately after starting. It does rev high and clunks when I go into drive but WTF...I'm not waiting for the revs to drop before I leave in the morning.
If the temp drops down some at night then you should at least start the truck and let it idle for 30 seconds to even a mins before putting it in gear just to let everything warm up and get oil going to all parts of the motor and tranny. When at my lake house, North GA mountains, the temp drops well below freezing in the winter and I always let the motor run for a mins to even 2 mins or so for the first start of the day.
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Old 10-26-2008, 06:57 PM   #13 (permalink)
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I agree that waiting is better. I get up very early and here in Maine it is always cold so the engine really howls on start-up. I put it into drive and get going quickly because it is much quieter. Don't wanna tick off the neighbors.
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Old 11-01-2008, 03:43 AM   #14 (permalink)
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same thing always happens with me on cold starts i wait for about 30 seconds and the rpm drops slowly. its alwayz best never to start driving as soon as u start ur truck from a cold start. starting at cold start is most critical as u should wait for it to lube up
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Old 11-02-2008, 07:18 AM   #15 (permalink)
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I don't think it makes much difference if you take it easy. I live in a 25mph neighborhood so I'm driving slow for the first few minutes. With all synthetic lubricants, moving parts are coated even if sitting for a few days. I just don't believe in letting a car or truck warm up for several minutes sitting in a driveway. It's a waste of gas. 10 seconds is plenty of time.
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