Jeez, you guys! Jim's gonna be pissed at me for posting that picture!

pfb, I think VTEC is still just as pronounced as ever.

The high idle behavior is interesting; I'm trying to figure out why the ECU would be programmed the way it is... After I come to a complete stop (and the idle drops to 1000 RPM), if I let off the brake and roll (downhill) to about 3 MPH, the idle will come back up to 2100 RPM. That's with no throttle applied, never in gear.

The throttle body butterfly obviously makes a good enough seal that it CAN idle at 1000, and it DOES idle at 1000 IF it senses no speed. But if it does sense any speed at all, it raises idle to 2000.

Any theories?

 

The idle speed in the S2K in completly control by a electronic valve that has no adjustment. Contrary to past Honda/Acura models that had a screw in the TB that allow you to set the amount of air bypassing the TB butterfly.

Since the ECU controls the valve, and we have seen how moody the ECU is, I bet that it's getting confuse by some other sensor or the speed reading.

Did you reset the ECU? Try that.
Also be sure the TB is well seated on the manifold and that the gasket is Ok.

 

Tedster, I had the same problem. It seemed to me that the throttle was actually "sticking" when I would push in the clutch, take it out of gear and coast to a stop. When it did come down to idle all it would take was a very slight tap of the gas to send it back up to 1500-2000rpms. Most of the time, if I sat at idle too long, the check engine light would come on and the idle would become totally erratic. I went 'round and 'round with Jim about this and went as far as replacing my MAP sensor. Well that didn't work so Jim said to try and using a dremerl tool to shave some of the manifold away where the air flows by the Map sensor. That didn't work so he ended up replacing the whole thing. I'm glad he did because it is like night and day!! Smooth idle, no sticking and all is well!! Jim has been absolutely terrific through all of this and so let him know right up front that you are having these problems. Good luck.

 

Pepe,

thanks for the info.

I did reset the ECU (hopefully) by disconnecting the negative lead on the battery for several minutes. I just read in another thread "to reset the ECU: remove the third 7.5 fuse on the right row from the top down for more than 10 seconds". Maybe I'll try that, just in case.

I'm pretty sure that Jim Hill (of Proflow) got the TB seated correctly, and the gasket looked fine.

There was a bit of an overhang where the manifold inlet was smaller than the bored TB, right where the MAP sensor pickup is. RT did some Dremel work there, in hopes of preventing turbulence that would mess with the MAP sensor. But that could still be the cause of the problem.

Jim has a new MAP sensor that we will swap in as another possibility.

Any other suggestions?

 

No Rice,

sounds like mine is behaving similarly to yours but not quite the same. Tapping the gas (when stopped) won't raise the idle. I haven't tried sitting at idle for more than 2 minutes, maybe (longest stoplight), but I haven't seen the Check Engine light, or had erratic idle. See my post above about the Dremel tool and the MAP sensor.

Glad to hear you eventually got everything squared away.

Yeah, Jim has been great, and since I'm in his area, he's using my case to learn as much as he can so future TB installs will be even smoother.

 

If you park in a garage may I suggest that you disconnect the battery and remove the ecu fuse for an entire night. I have had other cars where it would take more than a few minutes for the ecu and battery to be disconnected before it would reset.

 

I'm really anxious to get some warmer weather and dry roads to run the new TB through it's paces.

I can't imagine why my VTEC would be less pronounced, but we've had threads discussing how a particular brand of oil causes VTEC transition changes

The car did seem very quick after the TB install, but after driving my winter L.R., it damn well should!

My idle was very irratic at first, seems to have settled down, but again, very few miles since install.

P.S. Here's my install picture...


..and my paper-clip voltage measuring technique:


Ain't she pretty?



[This message has been edited by pfb (edited December 13, 2000).]

 

When the hell is mine comming!!!

I was like #2 on the list and they had 2 TB's going! All this talk now I really want mine to be here!

Its a X-mas present I got my STB early!(its on the car already!) I got the TB and X brace in the works. Lots O fun!

 

I had problems with my MAP sensor that made a big difference in performance, but never affected idle. Frankly it sounds a lot more like a poor seal or sticking plate in the TB.

 

cdelena,

can you help me understand what you're saying?

How would a poor seal or a sticking plate (I assume you're referring to the butterfly?) cause correct idle below 3MPH, but high idle above 3MPH?

It seems to me that vehicle speed ccould only come into play if the ECU is reacting to it, but I'm only guessing.

Thanks,

Ted