I'm experiencing the engine bog/ rpm dip when coming to a stop. It dips to around 500ish and then returns to 1K. It is more pronounced with the A/C on. I've read quite a few threads about this, but no one ever seems to post the best solution ... just a lot of try this and try that.

What is the most common solution? TB cleaning, MAP whack/ replacement/ tie, other?
I don't experience bog on acceleration.

 

I've got the same thing sometimes, Ive cleaned everything your mentioned: airbox, TB + plate, map whack, ecu reset, gas additive, IACV, etc.....

The only thing I can possibly think of is adjusting your idle a little higher, I was thinking of doing the same.. Honestly I dont even know where the idle is supposed to be from the factory, I think its between 800-1000 when warm.

 

reset the ecu yesterday. I wonder if this heat is really hosing it up. ECU reset didn't do much. I unplugged the MAP, and it looked good. I didn't zip tie it back in or do any serious whacks with a screwdriver.

 

my buddy's S had this happen too... he said it was attributed to the coilpacks. he swapped em out and he said no more problems so im gonna try this too in a couple weeks.

 

Push the clutch in at 1k RPM you will notice that it does not dip down to 500, and back to 1-1.5k.

There was a article on this somewhere that also included rev matching but I am not sure where it is. Most s2000's do this and unplugging the ECU will not resolve the problem since our ECU is a learning ECU. I notice everytime I wait for my car to slow down to 1k and then push in the clutch all is good.

 

THat contradicts everything else I've read, and I cannot drive the car that way.

I had a similar issue with my 2.0l G20 >>> a TB and MAF cleaning corrected the majority of the issue.

 

This happens to me too and it has been bothering me much lately.

 

Its normal. I've done everything possible on mine, even a whole new shortblock (scored cylinder on old one) and it still shakes sometimes when its really hot out. It does it the most with the A/C on, but hasnt died on me at least. Its just something you will have to live with owning an s2000. Some people say getting a torque damper helps alot, maybe you should look into that.

 

You cannot push in the clutch right at 1k RPM?

For example I will be shifting down and when I come to a light in second gear I will push in the clutch exactly at 1k RPM and the RPM's do not dip at all. If I do the same thing but push the clutch in at lets say 2-4k it will dip and then rise back up to 1k.

I read a article and it was what encouraged me to do this so far it works everytime. Yes its annoying to watch your RPM's drop to 1k. I have read that it does not harm your engine for it to dip so you should be safe.

 

An aftermarket/lighter flywheel will also cause this, I have an F22 with an ap1 flywheel and mine constantly does this. But more so with the a/c on due to more load on the engine. I think that when you let off the gas, the load on the engine(a/c) causes it to drop below idle for a sec. Rev matching should help though.