Does anyone know why my cars idle drops to two bars when I come to a stop light and then goes back to it's normal position?
It died a few times when I was on low fuel, so I filled it up and it drops to two lines on idle and sounds like it's about to die. Does anyone know what it might be?

 

Check if the Throttle Position Sensor (on side of the throttle body) is skewed tight. Happened to me once, turned out to be that. But DONT take that sensor out.(IF You dont have any mods on the car, if you do, it might be something else)

 

this is most likely the common "problem" that every S2000 can have.

this is covered in one of the FAQs at the top of this forum, and is probably asked every week.

our ECU is a learning ECU and has many sensors that it gets input from as well as high and low tolerances for those sensors. consider the high output nature of the engine, as well as the high redline, and you can see these tolerances are probably quite tight. if one sensor is reading a different extreme than another, etc, the ECU can become temporarily confused.

do NOT give the car gas to try to "prevent" it from stalling. this will only make it worse. simply drive as you normally do and after a few days at most it should clear itself up, assuming your weather isn't changing drastically every few days.

if your car does this for a solid week or two, there could be another issue.

 

I tried the map whack and unhook the Pos on the battery. So far this has helped.

thanks for the help

 

it will come back.

 

when you say it will come back do you mean it's going to come back soon or probably do this same thing later on down the road like other S2K??

 

same thing later down the road.

 

thanks for the help and heads up.

 

I have 79K miles on my car. My car would stall and die when stopped. Resetting the ECU helped, but the problem would come back. Pulling the ecu backup fuse kept it the engine from dying when I was stopped.

I did that untill I found out how to fix the problem. You need to CLEAN YOUR THROTTLE BODY. There is a thread somewhere on this board on how to do it.

I reset my ECU and cleaned my TB. My car runs great. Trust me. This is worth the $5 bottle of TB cleaner and 15 minutes of your time.

 

no, you had a DIFFERENT problem than the "ecu confusion" problem.

YOUR car was actually dying, and persisted doing so for a sustained amount of time. this is completely different than the car simply dipping too low on idle for a couple days and then fixing itself on its own.

people keep reading what they want to read and not actually looking at the facts presented. someone else had the "ecu confusion" problem, and someone else barged in with OMG CLEAN YOUR THROTTLE BODY. the person did that, and it didn't solve their problem. but lo and behold, 1 or 2 days later, the dipping idle problem went away because the ECU adjusted.