Lately engine turns at 1800 rpm after being started - Kia Forum
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post #1 of 12 (permalink) Old 01-10-2017, 10:30 PM Thread Starter
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Lately engine turns at 1800 rpm after being started

At about 1000km now and 2.0L engine now rev's up 18-1900 rpm when started, then the rpm's drop to "normal" after 15 20 seconds. Something that it did not do originally. It is winter here but this also happens in my heated garage

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post #2 of 12 (permalink) Old 01-11-2017, 12:29 AM
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I'm thinking it's just a cold start up thing. Combustion requires a lot more fuel when it's cold out. The RPMs are bumped up so it can push more fuel out quickly until the engine reaches an optimal temperature.

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https://www.reddit.com/r/explainlike...gher_rpm_when/
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post #3 of 12 (permalink) Old 01-11-2017, 09:51 AM
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This is the normal cold start cycle..

... Philip
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post #4 of 12 (permalink) Old 01-11-2017, 10:01 AM
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It depends on the temperature.

When I park outside and temp drops to -15 C then the cold start of 1.6T reaches 2000 rpm.
When ambient (and engine) is about -5 C the speed is about 1600 or so.

One time at near -20 C I believe it went over 2200 rpm.

Regardless - it always drops back to 1200 or so very quickly and then stays around 1000 when still cold. Final is nearly 700.


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post #5 of 12 (permalink) Old 01-11-2017, 11:32 AM Thread Starter
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Should I wait for it to drop or is it ok to put it in drive

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post #6 of 12 (permalink) Old 01-11-2017, 11:55 AM
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Quote:
Originally Posted by 1011555 View Post
Should I wait for it to drop or is it ok to put it in drive

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Use one trick to let them drop faster if you do not want to wait 10-20 seconds. Especially in garage...
Once the engine is running I give it maybe 5 seconds and then shift into Neutral. Fairly quickly. Not enough time to engage Reverse, but it is still good enough to get PCM send signal to ECU to drop engine speed. Wait 1-2 seconds in Neutral and engage in D. Wait until it completely applies power and then release brake.


I would avoid dropping it in gear right away. However, it is all idiot-proof. ECU will drop engine speed and will limit torque that will hit the transmission. Besides it does it very gently.
If you keep the brake applied, you will hear/feel how slowly the process takes place in cold. It is all to avoid the shock.


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post #7 of 12 (permalink) Old 01-11-2017, 12:44 PM
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OP says the hi revving also happens in his heated garage. IMO, if its 1800-1900 there too somethings not right. Maybe no big deal but seems odd.
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post #8 of 12 (permalink) Old 01-11-2017, 12:53 PM Thread Starter
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My garage is heated to 15 c so like fred says maybe something not right or maybe the vehicle gets in "winter mode" when it feels the weather is cold most of the time

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post #9 of 12 (permalink) Old 01-11-2017, 01:25 PM
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Quote:
Originally Posted by fredp View Post
OP says the hi revving also happens in his heated garage.
Mine is heated as well, but when outside is -20 C I keep inside +5 C...

Quote:
Originally Posted by 1011555 View Post
My garage is heated to 15 c so like fred says maybe something not right or maybe the vehicle gets in "winter mode" when it feels the weather is cold most of the time

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15 C, but measured where? Is the floor insulated/heated?

When I have +5 C inside, the near floor can be around 0 or even below.



Still, how long does the high speed last? What is the "stabilized" speed? And finally, what is the hot engine idle speed?
Could be that tachometer is a bit off?


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post #10 of 12 (permalink) Old 01-11-2017, 03:51 PM
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Mine has always had a high idle at start. Took awhile to get used to, BUT
that's why I bought new Kia with the 100k warranty. I pay very little attention
to the old rules of driving. I play with my paddle shifters, kick in the Turbo, etc.
knowing that it's under warranty for about 8 years at my current daily mileage rate.
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