ported TB concern
ported TB concern I have a ported TB and I have been having some problems with it since installation. The car idles fine, however I get an IAC count of 0 at idle with the AC off. Now the main problem I have is that when I let off the throttle, and push the clutch pedal in, the motor revs up to about 2500rpms and hangs there for about 10 seconds then slowly falls to idle. I checked the TB cable and it is not "hanging" open or getting caught. I am guessing that there is just to much air getting past the blade where it was knife edged, but wouldn't that make the idle really crappy as well?
Anyone have any ideas?
<small>[ March 17, 2003, 11:43 AM: Message edited by: ClassicCollector ]</small>
Anyone have any ideas?
<small>[ March 17, 2003, 11:43 AM: Message edited by: ClassicCollector ]</small>
Re: ported TB concern IAC of zero means you have more air "leakage"
than the engine needs. A drilled hole, a blade
that doesn't seal right, or problems at the
IAC plunger sealing face could all be the root
of the problem. The last would come about from
epoxy globs or loose grinding residue.
You might try reseating the blade first, loosen
the screws just a bit, to where the blade is
able to move with some pressure but not flopping,
wind up the blade & let "snap" closed, tighten
screws in closed position. This should get the
blade to its best-seated location. Be sure the
stop screw isn't setting the "closed" position
too far open when you do this, back off if need
be and then reset when done. A stop setting too
backed-off might let the blade go over "dead
closed" if you ground the bore totally smooth,
check for daylight and minimize it.
than the engine needs. A drilled hole, a blade
that doesn't seal right, or problems at the
IAC plunger sealing face could all be the root
of the problem. The last would come about from
epoxy globs or loose grinding residue.
You might try reseating the blade first, loosen
the screws just a bit, to where the blade is
able to move with some pressure but not flopping,
wind up the blade & let "snap" closed, tighten
screws in closed position. This should get the
blade to its best-seated location. Be sure the
stop screw isn't setting the "closed" position
too far open when you do this, back off if need
be and then reset when done. A stop setting too
backed-off might let the blade go over "dead
closed" if you ground the bore totally smooth,
check for daylight and minimize it.
