New to the tuning my own EFI...Truck is hard to start and wont idle.
Ok so I built a mild Ford 390FE, Edelbrock Performer RPM Heads, intake and Cam. I am using the 600hp Power Adder with an HEI distributer.
I can get the truck to start but have to feather the gas pedal and I am unable to let it idle on its own at all...
IAC shows like 219-221 during cranking.
- Lift: .572''/.572''
- Duration @ .050: 236°/236°
- Advertised Duration: 296°/296°
- 1500-6500 RPM Range
| Combustion Chamber Volume: | 72cc |
| Intake Runner Volume: | 170cc |
| Exhaust Runner Volume: | 125cc |
| Intake Valve Diameter: | 2.09'' |
| Exhaust Valve Diameter: | 1.66' |
First of all, IAC steps are only for idle. Does it require throttle to start? Are you running timing control?
Flat tappet cam? Is it broke in?
It does require me to throttle it to start the truck. I am not running timing control (TC) due the HEI is not supported for TC. It is a Hydraulic Flat tappet cam and I ran the truck to temp and varied the RPM range from 1600-2100 for close to 20 minutes. Rock solid oil pressure Temp over 188 then I turned on the fan manually(I will wire the fan control in tomorrow).
Fuel system is the Fitech inline 255lph Pre and post filters with a #6 return line, no Fuel pressure gauge yet.
Ok good. Was the temp reading from a gauge or the handheld? As for throttle. Shut key off, turn idle screw in a 1/4 turn (clockwise). Turn key on, verify 0 TPS reading. Try start and idle. Repeat once more if needed. Anything more may be another problem.
Let me know progress. More steps after that.
The hand held and dash gauge were pretty close to each other. I actually installed two temp sensors one from FiTech and another Original sensor into a different port, about a 1/2" from each other.
I will adjust and advise after lunch. Any preferred large gauge settings to watch?
Until it idles, only need to worry about vitals. Coolant, oil, sounds, leaks. Every time you turn the key on, verify your initial settings. The memory battery is not charged yet and the Fitech can loose its settings. Usually good after a few hours of running.
Important, all initial tuning must be done at operating temperature. Once it idles, check IAC steps. Would like to see 15-20 steps.
Learn to Datalog. Record a log at idle for about 30 seconds. Use Dropbox to post, leave the link here.
Ended up doing a 1/2 turn on the idle screw...it starts a little easier but still wont idle as soon as i let off any pressure of the throttle it dies pretty quickly.
What would you suggest next?
Thanks
Dave
Have you checked your initial settings?
All of my initial setting are saved and pull up on the initial settings screen.
Ok, trya little moreon the screw. See if you can get to idle. Get up to temp and get a datalog.