Throttle body problem

Y2k · Mon Oct 09, 2006 8:18 pm

I think i have a stucked TB. when i step on the pedal and rev it up, it will stays high (3-4k). it feels like the cruise control is turned on or something (although it's not). I have to pop the hood up..played with the TB abit and then it will come back to idle.
when i'm on the road, if the rpm is still at 2-3K and disengage the clutch then the rev will never come down. In order to take it down, i'll have to wait till it reaches about 1k before i engage the clutch then the rpm will stays at about 1k (idle). Seems to me like the plate never got closed perfectly and still leaking air into TB.

what do you guys think the problem might be? dirty TB? the car has cruise control though so i dont know if that is the problem.

Mon Oct 09, 2006 8:52 pm

Is this on your 'beater' aerocharged one?
What TB is it running?

Y2k · Mon Oct 09, 2006 9:58 pm

yea..its the FC 65mm TB.

sc0tty8 · Tue Oct 10, 2006 5:46 am

I'd take it off and hose it down with a can of carb cleaner, go to wal-mart, its $1.14 a can for the super tech brand. Then, get some 3-in-1 house hold oil and put a few drops in the pivot points.

Tue Oct 10, 2006 9:34 am

I dunno, that seems out of the ordinary for sure. I do know that setup can have problems with a slight hanging rev. Nicks Aerocharged setup with the 65mm FC TB always has a hanging rev, everytime you shift it hangs while your shifting and doesn't drop down till the clutch comes out... I always thought it was weird driving his car. Ask him, I think he may have fixed it.

zurno · Tue Oct 10, 2006 4:11 pm

my car still does it

does the revs go down if you leave the clutch pushed in for awhile? or would it hang for an endless time?

Y2k · Tue Oct 10, 2006 5:21 pm

mine will hang endlessly.. i did pop the hood when it did that and play with the TB and it came down to normal so i dont know...

sc0tty8 · Wed Oct 11, 2006 5:34 am

Is the TB closed when it hangs?

Y2k · Wed Oct 11, 2006 6:47 am

sc0tty8 wrote: Is the TB closed when it hangs?

i would think it is because when i wiggle it it hardly move and the idle came back down right away.

sc0tty8 · Wed Oct 11, 2006 7:25 am

I'd try to adjust that screw to make sure its closing all the way. These FC TB's have always been a bitch. I think IMINHELL has one...

zurno · Wed Oct 11, 2006 4:29 pm

co_macho wrote:
sc0tty8 wrote:Is the TB closed when it hangs?

i would think it is because when i wiggle it it hardly move and the idle came back down right away.

anyone know if a TPS could do that? maybe it isnt seening it as being fully closed or something?

just an idea

sc0tty8 · Thu Oct 12, 2006 5:44 am

zurno wrote:
co_macho wrote:
sc0tty8 wrote:Is the TB closed when it hangs?

i would think it is because when i wiggle it it hardly move and the idle came back down right away.

anyone know if a TPS could do that? maybe it isnt seening it as being fully closed or something?

just an idea

There are 3 positions on it for the TPS to screw into.

Y2k · Thu Oct 12, 2006 6:56 am

IMINHELL · Thu Oct 12, 2006 12:16 pm

Yup I got the FC 65 on my bomber too. Seems everyone but me has a problem with hanging revs *snickers*.

I believe your problem has more to do with a vacuum leak. Pull the TB off and do as Scotty said (soak it down with carb cleaner), also spray a shit load down the IAC port (these like to gum up real bad), toss that cheesy TB gasket out; use some type of silicone gasket maker instead (and use alot, fill the holes in the manifold base, I used VersiChem Mega Black). That is the process I used a while back and have yet to have a problem, 3 years and counting.

Things may change though. I recently found out that my TPS is having issues. I have had a TPS low input voltage problem for a while. I am going to put a new one on today and log some more. The computer is running in a sort of limp home mode right now. My throttle position is based on air flow; closed, part throttle and wide open throttle. I do not see WOT until after 3500 rpms. I'll update this if anything changes.

Oh and if you have a "sticky" TB try using a Dremel and "knife edging" the throttle plate. I'm still working on sizing out new shaft bearings/seals too.

John