Cold start Engine is Reving itself.
#1
Cold start Engine is Reving itself.
So I went to go warm my car up today to leave for work, it started fine but once running my RPM was jumping from 2 to 3 without me touching the gas or anything. This does not happen as long as I have the clutch pushed in but as soon as I let go my RPM's jump up and down. I'm not getting any check engine light It is the coldest day of the year today where I live only 7 degrees outside, does anyone know what is making this happen?
Last edited by RX892; 01-22-2013 at 05:44 AM.
#2
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So I went to go warm my car up today to leave for work, it started fine but once running my RPM was jumping from 2 to 3 without me touching the gas or anything. This does not happen as long as I have the clutch pushed in but as soon as I let go my RPM's jump up and down. I'm not getting any check engine light It is the coldest day of the year today where I live only 7 degrees outside, does anyone know what is making this happen?
Last edited by Cliffjumper126; 01-22-2013 at 06:20 AM.
#5
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This is called an 'idle hunt'. It is usually in response to the ECU not knowing if you are in neutral or not, usually due to some sort of failure in the neutral switch circuit (unplugged, frozen, damaged, melted, etc...)
Pushing in the clutch returns it to a stable idle because that has a separate switch, and the ECU now knows what state it's in.
High idle when cold is normal, a super high idle is also normal when it's REALLY cold (somewhere below 0f)
Pushing in the clutch returns it to a stable idle because that has a separate switch, and the ECU now knows what state it's in.
High idle when cold is normal, a super high idle is also normal when it's REALLY cold (somewhere below 0f)
#8
Yellow looks faster.
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I always feel like an *** when I go outside to start my car and its really cold out.. Today it was about 9F, I started the car and idle went up to about 3.5k rpm. Its so loud.. everyone at the apartment complex also starting/cleaning off their cars look at me like i'm a scumbag.. I cant wait till it warms up..
#12
I did I could not find enough information please don't feel the need to help me cause I didn't ask you specifically...My idle is rough even when it's warm but if i push in the clutch it's perfect settles right down to where it needs to be. I'm taking it to the dealer tonight to see what the problem is I don't see any way of doing it myself. Appreciate everyone's help thank you
#13
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I did I could not find enough information please don't feel the need to help me cause I didn't ask you specifically...My idle is rough even when it's warm but if i push in the clutch it's perfect settles right down to where it needs to be. I'm taking it to the dealer tonight to see what the problem is I don't see any way of doing it myself. Appreciate everyone's help thank you
*facepalm*
Humanity has failed ... again/
#15
Same thing happens to me as well but it is normal. Just let it warm up for like 5-10 minutes first.
What's really cool though is that vacuum noise at the beginning + the high RPMs. I love listening to it now. It sounds like a jet engine starting!
What's really cool though is that vacuum noise at the beginning + the high RPMs. I love listening to it now. It sounds like a jet engine starting!
#17
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Its just a switch behind your clutch pedal, same thing happened to me about a year ago, took me 10 mins and if I remember correctly like 10 bucks at autozone to fix.
#18
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Hey guys, I hate to reopen this thread but I didn't want to start a new one. Quick question. I'm in LA and we've had a cold winter this year (40-50 degrees) which by any other standards isn't cold. My problem with my idle hunt when cold, started on a 55 degree morning and it has persisted throughout the winter. I figured it was a neutral safety switch, though I didn't have any CELS, and I figured it wasn't cold enough to need to rev like that to get warm. Now today it was around 70 and the sun was out and no idle hunt when cold. I was just wondering if the conditions (high 80's and 90's) throughout the year and those in which my engine was rebuilt would lend to the idle hunt in 50 degree weather? With no cel, or as far as I can tell, no vacuum leaks, I'm in a bit of a pickle about the issue. I've also noticed my 8 a little more hungry for gas as of late, though that could just be because I haven't tuned it properly yet. Any help, or the mandatory flaming about searching and all would be greatly appreciated. It's an '04 with bhr midpipe, coils and wires, revi intake and duct, sohn adapter, lightweight flywheel, and an hks hi power exhaust by the way. Thanks!
#19
#21
Water Foul
The directive to search has everything to do with more experienced members being tired of answering the same questions over and over and over and over and over and over again. New members can quite literally find the answer to every question they can muster by reading the stickies or searching, and they can do it faster than they can create a new thread. Redundant (and necro) threads do nothing but clutter the site. Everything you need to know is here. Do a modicum of work yourself.
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