this is sort of hard to explain, but it seems as I let of the pedal, either inbetween shifts (somewhat fast pedal deceleration) there is a bit of a jerk, and even when letting it off slow, without pushing the clutch in to disengage gearing, the car "hesitates" or hops forward, even if I try to let the gas off really really slow. I noticed that upon gradual gas pedal pressure release that either the spring for the pedal itself or something in the mecanism feels tight for about 85% of the release, and just as my foot comes up off the pedal it loosens a bit, and I have to slow down the rate of "foot off the gas" or I get that hesitant jumpiness. Do u know what I mean? Im not sure if its supposed to be like this, because I have not driven any other RX other than my own.

 

This is normal, I have driven over 10 FD's including my own and they have all done this. You can really feel it with the A/C on.

 

why do u feel it more with the A/C on?

 

I feel it too. You are not alone.

 

I've never noticed this myself but as for you feeling it more when the A/C is on, it's probably because the computer gives the engine more gas when the A/C is on to compensate for the increased load, thereby trying to maintain the same RPM.

 

my theory is that this has nothing to do with the throttle system, it is the driveline slop that makes it 'bounce' around....I'd bet that stiffer motor mounts or a tourqe brace would eliminate some of this.

 

Hmmm... I'm not sure I get that. Maybe I'm just used to it. ??

 

Every FD Iv been in has done this also. Its kind of annoying and makes the car seem less streetable.

 

My FC did it as well. three throttle positions: on, which transitions not so sofly to... mediocre, just loafing it, which goes to... off, decelerating. So my FD's behavior was not unsurprising. An emissions thing to be sure...

 

Try replacing and cleaning your stock grounds, as well as adding new ones. If that doesn't help the problem, blame me.

 

You don't want to shut your butterfly's off completely very fast when you let off the gas with a turbo engine so there is a little slop item on the throttle linkage on the throttle body to keep you from overboosting your turbos before the bypass valves can react.

It looks like a small vacume body on the throttle body just in front of where the rotating part for the linkage connects up. Usually steel gold with a white part protruding from the front. There are no hoses connected to it but it is manually adjustable.

You can grab it with your hand and twist it loose, get it to where you want and then tighten up the nut next to it.

If you have slop, then this might be going out or the spring or plunger might be gooked up or something. Whatever you do, don't remove it. Bad for the turbos to have too much back pressure when you take your foot off the gas, will probably burst an intercooler tube or the intercooler itself.

Some lubricant and some exercising should be able to get it back in place and operating correctly.

 

I heard that extra grounds or better ones can help with 3k rpm hesitation as well. Some type of triangular ground system going from the block, to the battery, and to the firewall. The main ground for the block practically right next to the firewall right? Where are the other grounds located, if there are any?