Engine idle bog, dip, studder, stalling, etc
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Joined: Dec 2011
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I just had the same experience for about 3 weeks of ownership. It never do that in this past 3 weeks. Tonight, i went out to get gas. Everything is find until i was on my way home, and coming to a roundabout, i brake and slow down the car, downshift to 2nd, and then the car stalled. NO CEL. I was stopped in the middle of the road. I tried to restart the car, it was difficult to start. It cranked, but did not start.
I tried to restart twice, and it didn't work. After 30 seconds, i tried again, and it started right up. i couldn't seem to find anything wrong with the car, i didn't feel the engine is bogging or bad idles, etc.
This happened again when i am approaching my driveway, downshift to 2nd, and speed is quite slow as i am getting ready to get on my driveway ramp. It stalled. And again, i had difficulty to start the car immediately. I have to give it a decent 30 sec to a min, it started right back up.... Still no CEL....
what's the problem here? i don't wanna get strand in the middle of the road again. It was quite dangerous.
I tried to restart twice, and it didn't work. After 30 seconds, i tried again, and it started right up. i couldn't seem to find anything wrong with the car, i didn't feel the engine is bogging or bad idles, etc.
This happened again when i am approaching my driveway, downshift to 2nd, and speed is quite slow as i am getting ready to get on my driveway ramp. It stalled. And again, i had difficulty to start the car immediately. I have to give it a decent 30 sec to a min, it started right back up.... Still no CEL....
what's the problem here? i don't wanna get strand in the middle of the road again. It was quite dangerous.
Joined: Jun 2016
Posts: 192
Likes: 24
I just had the same experience for about 3 weeks of ownership. It never do that in this past 3 weeks. Tonight, i went out to get gas. Everything is find until i was on my way home, and coming to a roundabout, i brake and slow down the car, downshift to 2nd, and then the car stalled. NO CEL. I was stopped in the middle of the road. I tried to restart the car, it was difficult to start. It cranked, but did not start.
I tried to restart twice, and it didn't work. After 30 seconds, i tried again, and it started right up. i couldn't seem to find anything wrong with the car, i didn't feel the engine is bogging or bad idles, etc.
This happened again when i am approaching my driveway, downshift to 2nd, and speed is quite slow as i am getting ready to get on my driveway ramp. It stalled. And again, i had difficulty to start the car immediately. I have to give it a decent 30 sec to a min, it started right back up.... Still no CEL....
what's the problem here? i don't wanna get strand in the middle of the road again. It was quite dangerous.
I tried to restart twice, and it didn't work. After 30 seconds, i tried again, and it started right up. i couldn't seem to find anything wrong with the car, i didn't feel the engine is bogging or bad idles, etc.
This happened again when i am approaching my driveway, downshift to 2nd, and speed is quite slow as i am getting ready to get on my driveway ramp. It stalled. And again, i had difficulty to start the car immediately. I have to give it a decent 30 sec to a min, it started right back up.... Still no CEL....
what's the problem here? i don't wanna get strand in the middle of the road again. It was quite dangerous.
I have replaced the MAP sensor and the IAC motor with OEM units and its still acting the same. I've cleaned out the TB but I have a feeling it may be a sticky butterfly that could be causing this.
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Joined: Mar 2015
Posts: 2,418
Likes: 155
From: Eastern Ontario
I would check the engine ground cable on the back of the head, this seems to cause different issues and replacing it has helped many owners.
There is a recent thread describing this. Good luck.
https://www.s2ki.com/forums/s2000-un...ts-up-1108318/
There is a recent thread describing this. Good luck.
https://www.s2ki.com/forums/s2000-un...ts-up-1108318/
Last edited by Hfreak; Mar 25, 2017 at 10:23 AM. Reason: posted link
Joined: Jun 2015
Posts: 41
Likes: 1
Wouldn't it be easy to just replace the IAC as another option? they are like 80 bucks...
This question gets posted a TON. The symptoms are any of the following:
Engine idle dips really low when coming to a stop, and car sort of "shudders" because rpms get down to 300-400 rpm.
When at a stop, after giving a small amount of gas, and then pushing the clutch back in, such as backing out of a parking space, etc, the engine idle dips low and almost stalls.
Any other variation of the above. I will add other specifics as they become available.
So now that this happens, here are the steps and solutions to this problem.
First, understand that our ECU is a "learning" ECU. It is taking readins from many different sensors and adjust timing and fuel mappings based on the readings it gets from these sensors. At times, the readings can conflict for one reason or another, and cause the ECU to become confused. This is THE MOST COMMON reason for this bogging idle.
When this happens, DO NOT give the car gas, as it makes it more difficult for the ECU to "relearn". This ECU confusion occurs most often when there is a big change in temp or humidity in the atmosphere.
So:
1. Give it a couple days. The idle problem will most likely go away on its own. Though keep in mind it can come back again when the same conditions occur again! This is normal for our cars!
2. If after several days, this problem is still constant, try the "map sensor whack" located here:
https://www.s2ki.com/forums/index.php?showtopic=209708
Also, securing the map with the "zip tie" method may help.
3. If this does not work, clean the IAC motor. I will provide more specifics and possibly pictures on how to do this if I can. When you clean the IAC motor, if you notice a lot of oil and very thick crud in the area, you may need to install a catch can or figure out why you're getting so much oil blow by into your TB area from the PCV.
4. If that still does not work, you may need to replace the map sensor. (this does happen!)
5. If that doesn't work, then you may need to replace the IAC motor, though generally, this causes a high and low erratic idle when it goes bad.
Engine idle dips really low when coming to a stop, and car sort of "shudders" because rpms get down to 300-400 rpm.
When at a stop, after giving a small amount of gas, and then pushing the clutch back in, such as backing out of a parking space, etc, the engine idle dips low and almost stalls.
Any other variation of the above. I will add other specifics as they become available.
So now that this happens, here are the steps and solutions to this problem.
First, understand that our ECU is a "learning" ECU. It is taking readins from many different sensors and adjust timing and fuel mappings based on the readings it gets from these sensors. At times, the readings can conflict for one reason or another, and cause the ECU to become confused. This is THE MOST COMMON reason for this bogging idle.
When this happens, DO NOT give the car gas, as it makes it more difficult for the ECU to "relearn". This ECU confusion occurs most often when there is a big change in temp or humidity in the atmosphere.
So:
1. Give it a couple days. The idle problem will most likely go away on its own. Though keep in mind it can come back again when the same conditions occur again! This is normal for our cars!
2. If after several days, this problem is still constant, try the "map sensor whack" located here:
https://www.s2ki.com/forums/index.php?showtopic=209708
Also, securing the map with the "zip tie" method may help.
3. If this does not work, clean the IAC motor. I will provide more specifics and possibly pictures on how to do this if I can. When you clean the IAC motor, if you notice a lot of oil and very thick crud in the area, you may need to install a catch can or figure out why you're getting so much oil blow by into your TB area from the PCV.
4. If that still does not work, you may need to replace the map sensor. (this does happen!)
5. If that doesn't work, then you may need to replace the IAC motor, though generally, this causes a high and low erratic idle when it goes bad.
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