First Start Up in the Morning
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Joined: Sep 2001
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From: Guaynabo
First Start Up in the Morning
When I start the car up in the morning for the first time, the automatic choke kicks and the motor revs up and suddenly tries to die almost to a shut down, but hangs in there and revs up again. This only happens on the first turn on in the morning, afterwards during the day it turns on well.
What could be causing this?
What could be causing this?
Joined: Jan 2002
Posts: 5,069
Likes: 4
From: Barkhamsted
I dont know the answer to your question but ever ever since I bought the car new I had in really cold mornings but not always. After that it's flawless so I never bothered to look into it...
damn i just realized you are in the beautiful puerto rico weather.
PS. Voy pa ya pronto!!
damn i just realized you are in the beautiful puerto rico weather.
PS. Voy pa ya pronto!!
Joined: Mar 2001
Posts: 37,305
Likes: 18
Here is a "copy/paste" of a PM I got and answered. Obviously, temperature is not the key facter in your case, however, some of the other conditions may still apply. In any case, have a read. It may serve to provide you with some comfort. Because you are in P.R., I would suggest that you do the "MAP whack" and ECU reset. Here are the threads to help you with those:
http://forums.s2ki.com/forums/index.php?showtopic=209708
http://forums.s2ki.com/forums/index.php?showtopic=183490
Here is that PM discussion:
If your description is accurate, there is nothing to worry about. Many S2000s will have this peculiar trait whenever the climate changes. I've posted about this many times to re-assure people that nothing needs to be done unless the problem doesn't resolve itself after a week or so.
When the environmental changes occur, as in a change of season, the ECU gets a bit of a "brain fart". I went through this every fall for the first 3 falls I owned the car. The engine would fire up and then immediately die. Upon the second start, it is fine. The combination of temperature, humidity, air pressure at certain times of the year make this happen. The ECU will "learn" after several episodes of this behavior. DO NOT try to compensate with the gas pedal. ALWAYS just crank it and let it start and die. After several of these, it will learn and not do it anymore till next season. For me, after 3 seasons of this, the car no longer does it.
The noise you hear is the secondary air injection pump running. It will always run for a minute to a few minutes after a start. The colder the engine, the longer it stays on. It's to help heat up the cat so the emisions are lower after a cold start.
If you "help" it by giving it gas, it will take that much longer for it to learn. About the only thing you might do it to wait about 3 to 4 seconds after you key the ignition on before you hit the starter button. This will allow time for the fuel system to fully pressure up before the engine tries to runs. This might quicken the learning process but it really isn't that necessary.[/QUOTE]
http://forums.s2ki.com/forums/index.php?showtopic=209708
http://forums.s2ki.com/forums/index.php?showtopic=183490
Here is that PM discussion:
Hello again,
I've been digging though many posts on idle problems. I too experience the "bog" on warm starts etc... I have gotten a few helpfull tips to try to clear those things up. However I haven't seen anyone talk about idle problems on really cold starts. Here in North Carolina its starting to dip around freezing overnight and in the mornings on the way to work I'll start the cars and it will crank just fine for about two seconds and then you hear what appears to be the front fans kick in (AC/heater is off) and when you hear the fans spin up (I always hear a "click" I believe I see the dash lights flicker just a bit dimmer as I hear this click, and then hear a "whin noise" and then the car will die. All this happens in a matter of maybe 3 seconds. I'll start the car up again, and it runs just fine.
In my other car (280zx with almost 300,000 miles
) It will do a very similar thing unless I hold the key and let the fuel pump, pump 5-10 seconds.
Any ideas? I've always just passed this off as "normal". Just wondering if you have ever seen the same thing,
Thanks!
I've been digging though many posts on idle problems. I too experience the "bog" on warm starts etc... I have gotten a few helpfull tips to try to clear those things up. However I haven't seen anyone talk about idle problems on really cold starts. Here in North Carolina its starting to dip around freezing overnight and in the mornings on the way to work I'll start the cars and it will crank just fine for about two seconds and then you hear what appears to be the front fans kick in (AC/heater is off) and when you hear the fans spin up (I always hear a "click" I believe I see the dash lights flicker just a bit dimmer as I hear this click, and then hear a "whin noise" and then the car will die. All this happens in a matter of maybe 3 seconds. I'll start the car up again, and it runs just fine.
In my other car (280zx with almost 300,000 miles
) It will do a very similar thing unless I hold the key and let the fuel pump, pump 5-10 seconds.Any ideas? I've always just passed this off as "normal". Just wondering if you have ever seen the same thing,
Thanks!
When the environmental changes occur, as in a change of season, the ECU gets a bit of a "brain fart". I went through this every fall for the first 3 falls I owned the car. The engine would fire up and then immediately die. Upon the second start, it is fine. The combination of temperature, humidity, air pressure at certain times of the year make this happen. The ECU will "learn" after several episodes of this behavior. DO NOT try to compensate with the gas pedal. ALWAYS just crank it and let it start and die. After several of these, it will learn and not do it anymore till next season. For me, after 3 seasons of this, the car no longer does it.
The noise you hear is the secondary air injection pump running. It will always run for a minute to a few minutes after a start. The colder the engine, the longer it stays on. It's to help heat up the cat so the emisions are lower after a cold start.
If you "help" it by giving it gas, it will take that much longer for it to learn. About the only thing you might do it to wait about 3 to 4 seconds after you key the ignition on before you hit the starter button. This will allow time for the fuel system to fully pressure up before the engine tries to runs. This might quicken the learning process but it really isn't that necessary.[/QUOTE]
Joined: Jun 2004
Posts: 155
Likes: 3
From: Cheney, WA
Dang, XViper!! You're reading my mind. I drove my S2000 in cold weather for the first time a few weeks ago and the engine died right after start. It started and ran fine on the second try, and the problem has not recurred. I remembered some of your earlier posts regarding how the S2000 ECU learns as climate changes and I figured that is what I had experienced. It's good to know that I was probably correct about the cause and can put this one out of my mind for good. Thank you!
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