what you're describing is the s/c clutch engagement. other's are describing a lurching/bucking/hesitation at low rpms. it typically occurs around 1-1.5k rpms and during low speed decel or low constant speeds (not accel) at off or minimal throttle applications.

 

Now that is new. I have not had ANY of thos symptoms during decel. I was confused. If on decel, look into tranny as well. Good thing for me, Vadim looks into all that stuff. During the ECU tune, they did a bunch of work on shift points, etc. and it made a huge difference in the overal driveability of the car.

 

I never had this durring decel. If this is happining durring decel I will then take back what I said its not the SC clutch its something else. But I dont remember anyone sayin decel?

 

keep in mind that i'm talking about very low speeds where the transition between on/off throttle is minimal at best...like in crawling traffic. so this is not decel as much as it is simply going off throttle.

 

I will have to try that and see what my car does. as of right now I have the same exact symptoms as the OP. and I know for a fact that it is my clutch kickin in.

 

Here is a star read on the CEL i got
This is a response i got
If I read the report correct, the OBD2 codes stored are:


P2007 Intake Manifold Runner Control Stuck Closed

P2008 Intake Manifold Runner Control Circuit/Open

 

Just out of curiosity, can you run the throttle body through an adaption process on these cars? This type of behavior seems very reminiscent of issues that would crop up with modded DBW Audi's - and I believe they're running similar TBs, and I believe a similar Bosch Motronic unit. You can do it on an Audi by just turning the key to the on position for 30-40 seconds, or using a VAG-COM to run it through a throttle adaption process - not sure if theres an equiv. for these?

In my experience, when the TB needed to be "adapted" frequently, it usually had to do with the wire brushes in the actuator compartment getting oxidized - nothing a little rubbing alcohol/contact cleaner wouldn't fix. (I am however not advocating this for your TBs, as I do not have experience with issues on this car )

 

Victor,

I will get some video of it asap. It happened about 5 times today all within a 2 mile drive. It definitely feels like the car falls flat on its face like the fuel was cut or TB slammed shut...nothing remotely like the jerky s/c engagement.

 

Updates?

 

I never got it on video (yet). The car still hits a wall but its gone from like a 1 second gap to a 0.2 second gap - lame but not absolutely terrible like it was before.

I am battling with 150F IATs and need to work that kink out first.

 

I know it's a longshot, but have you checked your charging system?

If the ECU sees a low-voltage condition, it will turn off accessories, including the pump...

 

Will it turn off the cooling circuit pump? I was getting the "electronic consumers are disabled" message due to having a light/lower charged Oddessy battery to save weight.

The bucking for the most part has gone away. I have new issues to solve now... throttle position sensor perhaps (my 0-10mph is about 5 seconds! and 0-60 in 25 seconds) and my IATs go haywire to 150 F about 75% of the time.

 

IMHO you have a bad IC pump.

 

[QUOTE=Jakpro1;2714622]I had one of the first VRP 80mm TB's and have run K2 even longer without a lick of trouble.

+1

I still love that damn mod!

 

Vadim,

What is the best way to determine this? Check voltage readings? Thanks.

 

Baller,

I must resurrect this thread as I am having the same exact problems.

Did you ever figure out what was wrong with your setup?

 

I noticed this also with the 82mm tb,the s/c kicks in alot harder with less throttle input.You just have to learn how to drive the car different.I can make it engage without any one noticing if you really slowly give it throttle and once the s/c is on you mash it.

If I nail it I get the same jerk you guys are talking about.