Need help - COLD/WARM start issues
Hello,
I have a SBC 400 with a mild cam and have installed a FITECH 600hp model. I'm using a 340gph internal fuel pump. I live in Austin, TX so the weather isn't terrible on the cold side. I have been struggling with cold/warm start issues since the install. I've tried many different things but I can't seem to get this thing to work properly. I have to put my foot on the pedal to get it started most of the time and even then it can take 3-5 tries.
My IAC steps are good and set properly. I have plenty of exhaust past the 02 sensor. I've tried both increasing and decreasing my my prime fuel and crank IAC. I've even even reset learned everything and reloaded the v8 profile. I've also checked voltage from the ignition and I am good there. The car is running extremely rich as well and smells up the whole garage while idling.
Not sure what else I can do and was looking for assistance. I've been on the phone with support numerous times and they usually tell me to set the default settings on the crank/warm-up and restart tweaks. Please help! 🙂
Oh, I think you mean 340 lph, which is about 90 gph otherwise that would be one huge pump. LOL Sounds like you need to modify the AFR settings at idle to start with in your tuning settings. Take your plugs out and clean them at least and lean the idle AFR up a point at a time until your plugs look good. Then you can work on other things. Good luck.
Agreed with Bdhulderman. Lean your idle afr first. Ou can also watch vacuum and lean until it quits raising, like carb tuning. Also listen to the idle quality. Last step tune to plugs.
Thanks all! I did mean LPH. I'll clean the plugs and go from there. What do you recommend when leaning out the AFR? Go from 13.60 to 13.70 or 13.61? And only idle or idle plus acceleration at idle?
Idle first....
There is no recommendation. Every build is different. Once you know your idle AFR, you can use that to build the rest of your tune. Highly recommend the $100 EFI University online tuning course to better understand.