7mech

Got the car back. We put in new 720cc injectors to replace the sticking stock injectors and tuned it for 14psi. It runs great at WOT but at part throttle and a dead stop it doesn't want to act right. When I'm driving from stop light to stop light it stalls everytime I stop. It starts back up everytime after it stalls out although I do need to give it some throttle when I try to restart it(same with initial start up of the day). When I'm driving it will hesitate and sputter at part throttle between 2-3k rpm. I can't figure out what seems to be causing this. The ideas I have are that my throttle cable needs adjustment, my BAC needs to be hooked up, the computer needs to setup for closed loop, and the TPS may need adjustment. The ideas I've been given are that my throttle body butterflies are sticking. Are any of these close to what may be causing my car to do this? What does the BAC do? Does it control idle air to help the car idle? Any thoughts on this and how to solve this problem would be greatly appreciated. Thanks.

vosko

who tuned it? sounds like its too rich or too lean at part throttle

7mech

I'll leave the tuner out of this. I don't need to be dragging anybodies name through the mud if you know what I'm saying. you could be right though. Oh yeah I forgot to mention that when you tap the throttle ithe rpm's will drop before they go up. Is that normal.

j9fd3s

its all tuning



mike

vosko

bring it back and tell them to tune it correctly

turborotor

Sounds like is runing pig rich. What are you running on the secondaries?

7mech

720cc injectors in all positions. It was tuned for an 11.5 to 1 AF ratio. The only time it acts wierd is in the lower rpm bands.

turborotor

This may sound stupid but did you tune down the vacuum part by -25%?

7mech

I'm not sure what that is and if it's been done. I'll check with my tuner about that. In the mean time can you explain what that is and does, so I don't sound stupid when I ask about it. Thanks.

turborotor

Probably he did but just a thought about it. When installing bigger primaires. I had to lean out the vacumm by almost 25%. Also how are the spark plugs. I had a simlar problem a few weeks ago when I installed 720 in the primaries. It fouled my spark plugs and had bad idle and part throttle problem tilli hit boost hard.



C