Very High Idle When Cold - Lexus IS Forum
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post #1 of 10 (permalink) Old 11-06-2009, 05:12 AM Thread Starter
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Very High Idle When Cold

Hello braintrust. I wonder if anyone can shed some light on my idle issue.

First I realize that a car should idle higher when cold so that the fuel burns properly. However in my '02 IS300 the idle, when cold, is significantly higher than it was when the car was relatively new. The cold idle is now in excess of 2K. What might cause this?

My car is a manual transmission and has approximately 95K miles on it. The plugs are original. I do clean (with proper cleaner) the MAF sensor annually.

I have added a K&N cone style cold air flter and I previousy had a shop install a header and full exhaust system. I am not sure exactly when the high cold idle started in relationship to the mod's however I am the original owner and therefore know the car's history.

Thoughts?
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post #2 of 10 (permalink) Old 11-06-2009, 09:16 AM
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thats normal. you have added more air flow so dont worry about it. mine can idle at 2500 when cold sometimes, but once warm, it reverts back to normal. as long as you dont have a vacuum leak causing a funky idle when warm, dont worry about it.

also think about wear and tear. the car is nearly 8 years old now....

YOU DONT DRIVE A PIECE OF JUNK SO DONT FIX IT LIKE ONE.

IF YOUR NOT GONNA DO THE JOB RIGHT THE FIRST TIME, YOU SHOULDNT BE DOING IT AT ALL
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post #3 of 10 (permalink) Old 11-06-2009, 10:16 AM
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It is getting cold out here too. I'll see where I'm idling at today when I leave work.

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post #4 of 10 (permalink) Old 11-06-2009, 10:19 AM
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on cold mornings mine is in excess of 2000 rpm as well. seems normal.

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post #5 of 10 (permalink) Old 11-06-2009, 12:11 PM
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yeah its normal.

maybe if it was like 3k. then you should worry about it bro.
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post #6 of 10 (permalink) Old 11-06-2009, 12:13 PM
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agreed with everyone else...the colder it is...the higher my idle. nothing to worry about.

2005 MSM Lexus IS300

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post #7 of 10 (permalink) Old 11-06-2009, 06:45 PM
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i think its normal since the higher the rpm the faster the enigne warm up and then go back to normal idle rpm.

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post #8 of 10 (permalink) Old 11-06-2009, 06:54 PM
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Same here. My car will get in excess of 2.5k during the cool morning hours

I WANT TO BE A RACE CAR PASSENGER.
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post #9 of 10 (permalink) Old 11-07-2009, 11:20 AM
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Glad to see this.... my new to me '02 IS does it and it seems excessive, so I was concerned. I've never had one that idled that high cold before. 1500 perhaps, but it's a tad over 2000.

Sounds normal, so I'll just drive it like I stole it (once I get my wheels back from the powder-coater that is).

'02 IS300 - Bone stock
'01 TJ - mildly modded for offroad fun
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post #10 of 10 (permalink) Old 03-16-2017, 09:24 AM
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I know this topic is old I have the same problem, I tried to look for any vacuum leaks around the engine. Some of the lines are cracked. I tried to diag it by spraying brake clean on the lines to see any changes at idle, so far no change. I noticed my EVAP VSV connector was connected but not plugged in all the way. I made sure it was connected all the way. Before the car would idle at 2k rpm at between 50-60 degrees outside temperature. After I secure the connection, and the weather got colder. It idles at 1500rpm around 30-40 now. hope this helps...
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