H/C A4 Stalling after start up.... has been tuned
08-20-2008, 10:15 AM
#1
Launching!
Thread Starter
H/C A4 Stalling after start up.... has been tuned Mods are in sig.
My car intermintently stalls right after start up. My tuner has tried to tune for it. I have a ported 98 TB with a stock blade. I have the idle screw adjusted to the border of 0 & 1% throttle.
Do I need to add a small hole to my TB to fix this?
Thanks
My car intermintently stalls right after start up. My tuner has tried to tune for it. I have a ported 98 TB with a stock blade. I have the idle screw adjusted to the border of 0 & 1% throttle.
Do I need to add a small hole to my TB to fix this?
Thanks
08-20-2008, 01:42 PM
#6
Launching!
Thread Starter
Not VATS.... Will also intermintently die from park to reverse with steering wheel turned.
Idle RPM programed in computer is 838...dont ask me why he set it at that.
Idle RPM programed in computer is 838...dont ask me why he set it at that.
08-20-2008, 10:00 PM
#7
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The relationship between the software control of the position of the IAC valve and the physical position of the Throttlebody set screw stop point is in error based on the conditions you have described.
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08-20-2008, 10:39 PM
#8
If you pretty much *ever* see the TPS flicker from 0 to 1%, you have the set screw in a little too far. There are idle routines that are constantly interrupted by this flicker. Back it out 1/4 to a half turn, reset the TPS and scan with the car running to ensure that it stays at 0%. The cars that flicker never seem to do it at key-on, only when the engine is actually running.
10-06-2008, 02:07 PM
#10
Launching!
Thread Starter
My guy (LJ / Qicsan) has tuned my car 4 times for this. We never get it to act up when he has the car....
Car also stalls out after a burn out...
Mods are in sig
IAC has been cleaned and reset.
Help anybody?
Car also stalls out after a burn out...
Mods are in sig
IAC has been cleaned and reset.
Help anybody?
10-06-2008, 07:05 PM
#12
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You have startup and friction airflow adders and
decays, which can / should be used to deal with
an increased startup airflow demand. This ought
to come after getting the startup / cold mixture
right, which is liable to be pretty bent on a cammed
car (higher idle MAP pushing higher open loop EQ
value, at the same RPM and likely similar real engine
torque losses as before). Piggy rich needs more air
to idle.
I had to play with my friction airflow decay a bit
before getting happy with cold start / run.
decays, which can / should be used to deal with
an increased startup airflow demand. This ought
to come after getting the startup / cold mixture
right, which is liable to be pretty bent on a cammed
car (higher idle MAP pushing higher open loop EQ
value, at the same RPM and likely similar real engine
torque losses as before). Piggy rich needs more air
to idle.
I had to play with my friction airflow decay a bit
before getting happy with cold start / run.
10-07-2008, 08:06 AM
#15
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You have startup and friction airflow adders and
decays, which can / should be used to deal with
an increased startup airflow demand. This ought
to come after getting the startup / cold mixture
right, which is liable to be pretty bent on a cammed
car (higher idle MAP pushing higher open loop EQ
value, at the same RPM and likely similar real engine
torque losses as before). Piggy rich needs more air
to idle.
I had to play with my friction airflow decay a bit
before getting happy with cold start / run.
decays, which can / should be used to deal with
an increased startup airflow demand. This ought
to come after getting the startup / cold mixture
right, which is liable to be pretty bent on a cammed
car (higher idle MAP pushing higher open loop EQ
value, at the same RPM and likely similar real engine
torque losses as before). Piggy rich needs more air
to idle.
I had to play with my friction airflow decay a bit
before getting happy with cold start / run.
...
