weirdness in the Throttle Cracker; stalling fix.
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iTrader: (11)
Joined: Mar 2002
Posts: 12,604
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From: East Central Florida
That throttle cracker table "sees" TPS and MPH. So you can
"fade" the airflow adder such that it adds less and less, as
you go slower / lower. It's only meant to make for a "soft
landing" and probably ought to have hit zero added air by
the time you cross the threshold MPH value in that little
box pair. However it's better to have an elevated idle than
a rolling engine stall behavior, if you have to choose.
I believe the main problem is the discontinuous, spike/hole
nature of the stock table; traversing these potholes has to
whack the IAC and its control loop around big time and it's
not that stable or responsive, to deal with it well (especially
when it's got other "challenges".
"fade" the airflow adder such that it adds less and less, as
you go slower / lower. It's only meant to make for a "soft
landing" and probably ought to have hit zero added air by
the time you cross the threshold MPH value in that little
box pair. However it's better to have an elevated idle than
a rolling engine stall behavior, if you have to choose.
I believe the main problem is the discontinuous, spike/hole
nature of the stock table; traversing these potholes has to
whack the IAC and its control loop around big time and it's
not that stable or responsive, to deal with it well (especially
when it's got other "challenges".
Last edited by jimmyblue; Feb 24, 2006 at 10:38 AM.
Dang Jimmy, I looked at that table a while back after hearing how much it helps cammed / stalled cars idle, but it didn't make sense to me. I see now I should have tweaked it to make sense. You're good....
my was was weird, with values in the throttle cracker table my car dipped comming to a stop, values at 0 its fine, idle comes down smooth as well and holds the idle well
ook, yeah i had a similar issue with mine, cool man im glad that worked out for you. i have actually been getting tons of messages about it saying its helped out, if i knew it would help that many people i would have posted a while ago, i just thought i had some weird issue lol
Hey fellas...
I have a 2000 Camaro with a big cam/stall and it idles at idle ok, but on deceleration it does the "hang at 1600 rpm" ting and then when at 99% stop, it surges back to idle at a dead stop. Also, the car likes to "drive itself" at abot 45 mph with my foot off the gas. My tuner used LS1EdiT for the tune...
Can any of you offer a file/table that I can show him to help him get my car to run right???
2000 Camaro, A4, .611/.619 242/250 114 cam, 4000 stall, etc.
I have a 2000 Camaro with a big cam/stall and it idles at idle ok, but on deceleration it does the "hang at 1600 rpm" ting and then when at 99% stop, it surges back to idle at a dead stop. Also, the car likes to "drive itself" at abot 45 mph with my foot off the gas. My tuner used LS1EdiT for the tune...
Can any of you offer a file/table that I can show him to help him get my car to run right???
2000 Camaro, A4, .611/.619 242/250 114 cam, 4000 stall, etc.
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This is exactly the thread I was looking for. I have the same problem with the car driving itself and the idle hanging at 2200 RPM when stopped. I have a FAST/NW 90mm with ported 243's and a 240 .595 114LSA cam will WS6FirebirdTA00's cracker tables help me out any? And if it doesnt is it easy to reset my old table? This is with LS1 edit.Thanks
yeah man its really easy, if it doesnt work use the old file. im helping out BAIN on here with his and his seemed to be hanging also because iwth the 90mm tb he was at 0 iac steps on warm idle
Originally Posted by WS6FirebirdTA00
yeah man its really easy, if it doesnt work use the old file. im helping out BAIN on here with his and his seemed to be hanging also because iwth the 90mm tb he was at 0 iac steps on warm idle
Hopefully related question...
I hooked up my EFI Live tonight, and scanned my car at key on (not started, not running, dead cold)...
My Throttle Position was 1.6%
IAC = 212 steps
MAP = 29.5inHG
I know I have a problem with my drivability (like others on this thread, hanging around 1600 rpm in drive, pushng itself down the road, etc....big cam, auto, big stall, big intake).
I also get a TPS code when the car is started, and I have replaced it. Does the fact that the TPS registers 1.6% with no pedal and key on make sense? Can this be contributing to my idle problem?
Thanks
SDB
I hooked up my EFI Live tonight, and scanned my car at key on (not started, not running, dead cold)...
My Throttle Position was 1.6%
IAC = 212 steps
MAP = 29.5inHG
I know I have a problem with my drivability (like others on this thread, hanging around 1600 rpm in drive, pushng itself down the road, etc....big cam, auto, big stall, big intake).
I also get a TPS code when the car is started, and I have replaced it. Does the fact that the TPS registers 1.6% with no pedal and key on make sense? Can this be contributing to my idle problem?
Thanks
SDB
what is your tps voltage? do a reset, unplug the sensor, turn the key on for a min or so, turn the key off and plug it in, should reset it. or you can drill out the botl holes in the TPS sensor and trim the tab and adjust it yourself to read 0.55-0.57 volts at idle, i bet your idle hangs on you comming to a light and acts all weird, like it never wants to go low enough when stopped??
Originally Posted by SDB
Hey fellas...
I have a 2000 Camaro with a big cam/stall and it idles at idle ok, but on deceleration it does the "hang at 1600 rpm" ting and then when at 99% stop, it surges back to idle at a dead stop. Also, the car likes to "drive itself" at abot 45 mph with my foot off the gas. My tuner used LS1EdiT for the tune...
Can any of you offer a file/table that I can show him to help him get my car to run right???
2000 Camaro, A4, .611/.619 242/250 114 cam, 4000 stall, etc.
I have a 2000 Camaro with a big cam/stall and it idles at idle ok, but on deceleration it does the "hang at 1600 rpm" ting and then when at 99% stop, it surges back to idle at a dead stop. Also, the car likes to "drive itself" at abot 45 mph with my foot off the gas. My tuner used LS1EdiT for the tune...
Can any of you offer a file/table that I can show him to help him get my car to run right???
2000 Camaro, A4, .611/.619 242/250 114 cam, 4000 stall, etc.
Originally Posted by SDB
I will do a reset, never knew thatcould reset it! It does hang at 1600 rpm until at a DEAD stop, then it settles back down to where it should be....I will try that prior to retune.
Thanks
SDB
Thanks
SDB
Originally Posted by WS6FirebirdTA00
here is what i had to do to mine. i was quite amazed at how much better the car came to idle