Wont start unless cause vacuum leak
#1
Wont start unless cause vacuum leak
Im obviously new to tuning...
I cant get it to start unless I remove a few vacuum caps and cause a vacuum leak.
This is an s4 tII w/microtech lt10s.
New rebuild.
If I pull 2 or 3 vacuum caps off, it'll start, but if I cap everything it tries to start, kicks over for a second, then dies.
I cant get it to start unless I remove a few vacuum caps and cause a vacuum leak.
This is an s4 tII w/microtech lt10s.
New rebuild.
If I pull 2 or 3 vacuum caps off, it'll start, but if I cap everything it tries to start, kicks over for a second, then dies.
#7
Moderator
iTrader: (1)
The BAC is an integral part of the idling process. It's possible that your AFM is not letting in enough air to allow the car to stay running given that the fuel amount is dialed in correctly. Maybe you'll want to check the flapper door to see if it is operating properly. And less fuel might be a thing to work with if the AFM appears to be okay.
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#8
The BAC is an integral part of the idling process. It's possible that your AFM is not letting in enough air to allow the car to stay running given that the fuel amount is dialed in correctly. Maybe you'll want to check the flapper door to see if it is operating properly. And less fuel might be a thing to work with if the AFM appears to be okay.
#15
This sh*t burns oil!
iTrader: (7)
There is, the microtech uses speed density(map signal and iat) and the map sensor is built into the unit itself so you only have to run a vacuum line to the LT10.
As far as this issue, I would try to adjust the TB to be cracked open slightly farther and reset to tps afterwards so you can make some fixes to the tune. I know it says new rebuild but what about the microtech, was that installed and working before hand?
As far as this issue, I would try to adjust the TB to be cracked open slightly farther and reset to tps afterwards so you can make some fixes to the tune. I know it says new rebuild but what about the microtech, was that installed and working before hand?
Last edited by SpikeDerailed; 04-06-15 at 02:23 PM.
#16
There is, the microtech uses speed density(map signal and iat) and the map sensor is built into the unit itself so you only have to run a vacuum line to the LT10.
As far as this issue, I would try to adjust the TB to be cracked open slightly farther and reset to tps afterwards so you can make some fixes to the tune. I know it says new rebuild but what about the microtech, was that installed and working before hand?
As far as this issue, I would try to adjust the TB to be cracked open slightly farther and reset to tps afterwards so you can make some fixes to the tune. I know it says new rebuild but what about the microtech, was that installed and working before hand?
#18
MECP Certified Installer
#19
Per SpikedDerailed's comment, I started thinking more in terms of providing the correct a/f ratio in order to get it to run right(I know should be obvious, but I'm new to tuning-used to taking that for granted).
So, I assumed that since it ran with no caps and alotta air, and didn't run with caps on and less air, then I needed less fuel. So, I figured out how to adjust fuel via the water map for on the microtech for the water temperature it was at while attempting to start.
I kept adjusting down incrementally until it fired up with caps on.
So, I assumed that since it ran with no caps and alotta air, and didn't run with caps on and less air, then I needed less fuel. So, I figured out how to adjust fuel via the water map for on the microtech for the water temperature it was at while attempting to start.
I kept adjusting down incrementally until it fired up with caps on.
#20
This sh*t burns oil!
iTrader: (7)
You're in Boston, this coming winter will be fun to get all the cold start maps fine tuned. Since you wont see cold enough temps to do it this summer, just remember as it starts to get colder you'll likely have to make some adjustments as you go or you'll run into another no start situation.
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