OK, this generally occurs when shifting between 4 and 5K RPM's. Happens when shifting into second or third, perhaps other gears too, but those are the only ones confirmed. Immediately after shifting gears and getting back on the throttle, only part throttle, the car will bounce back and forth for several seconds if I hold a constant throttle position, but stops if I let off the throttle. This only happens occasionally but I'm quite sure it's not normal and is out of my experience. Any ideas?

 

Hi Silroan,

I don't have an S2000 but I recently had a similar problem with my '01 Honda Odyssey. At about 54k miles, the van started surging on light throttle applications regardless of what gear the transmission was in. It turned out to be a partially plugged and/or sticking EGR valve. The dealer replaced it under my extended service plan and everythings been great since then.

What caught my attention when you described the symptoms on your S is the "part throttle", "holding a constant throttle", and "stops if you let off the throttle" qualifiers. My experience was exactly the same for all intents and purposes. I know I'm talking about a different vehicle but the symptoms are so close that I'd bet the EGR system is a reasonably good place to check first. Good luck!

Drive Safe,
Steve R.

 

I had something like this happen to me when I first got the car. I think some people here called the effect "kangarooing", and it would happen when I shift into 2nd and engage the clutch too abruptly in combination with either too much throttle or applying the throttle at the wrong instant. When this happens, I just disengage the clutch fully again and try to reengage more smoothly.

It hasn't happened to me in a while now that I've figured out how to engage the clutch smoothly. It seems that the S is a little more particular with how the clutch should be used.

 

Interesting ideas on both accounts...I'd almost prefer it was something wrong than to have to live with it. Guess i'll have to adjust driving technique and see what happens, if that doesn't work then perhaps it's time to go to the dealer.

 

Clutch it.

 

So I take it other people experience the same thing?

 

This is a well-documented phenomenon. There was a fix in an earlier thread about tightening up the slack on the throttle cable.

 

i had the same thing happen to me a couple times shortly after buying the vehicle... just adjusted and hasn't happened again since.

 

Hi Siloan,

I hadn't considered the situations that Snowball describes. All manual transmissioned cars (actually, all cars in general) have a certain amount of slop in the drive train. It's normal. On manual transmissioned cars and motorcycles I've driven, I have occasionally got into a drive train bounce (what Snowball called "kangarooing") if I made a sloppy shift from one gear to the next. The deal was, it was very obvious to me that I screwed the shift. There wasn't any doubt about it so there was no need to wonder whether or not something was wrong with the car.

Having said that, "if", the problem turns out to be something like the EGR system that I suggested, you should be able to verify that very easily. Bring the car up to 45 to 50 mph in third and/or fourth gear, maybe fifth. I don't know how rpm dependant this will be. Ease off the throttle until you're just maintaining speed. You should start getting that surge. My Odyssey was very consistant about it but only at light throttle applications. If I let off the throttle or accelerated, the surge would go away. I called it a surge because the automatic transmission damped out much of the sensation. I imagine that the S2000, being a manual transmissioned car, would feel much more rough under the same symptoms. Good luck.

Drive Safe,
Steve R.

 

This thread may help:
http://forums.s2ki.com/forums/showthread.p...25&pagenumber=1