Throttle limitation and power loss
Hey everyone,
I recently installed my fitech 30004 system on my ford maverick which has a SBF 302. It fired right up and has been running pretty well for the past 3 days besides a slight hanging idle but I was working those issues out. I was driving it home today and all a sudden it started to stumble. Whenever I was in gear and accelerating from a stop the car would start to stumble and experience a loss of power. I had to limp it home because anytime i would get around 2k rpm it was misfire city haha.
The interesting part is that if I was in 3rd gear and gave it some throttle the engine would almost die but if I back the throttle off slightly it would come back alive (kind of like a safety feature?). I pulled a log and have attached it below. I have highlighted a section of the log where the engine goes extremely lean and my AFR learn spiked and held at 50%. This section of the log is when I would gss it and it would cut the throttle and go lean. The O2 sensor is brand new and I just had custom exhaust fabricated so should be no exhaust leaks. I'm leaning toward a bad MAP or maybe something in my settings.
This is my first time troubleshooting an EFI system so any feedback would be greatly appreciated.
https://drive.google.com/file/d/1v8AF0kmisfBnxkVy8GjDMN9KONxGnN-o/view?usp=sharing
thanks in advance.
What is your fuel pressure?
Don’t over think it. 99 percent something simple.
Your log is too long. Try editing down to the problem area. I couldn’t get to it without the drive reloading the file.
You do have a lot of negative learn and trim is still large. What is you cam setting? What cam are you running? What is the engine?
I just ordered a fuel pressure sensor so will have that install in the next day or so.
i will edit the log to include only the problem area.
With regards to the motor it is a 302 moderate isky racing cam trickflow heads edelbrock dual plane 10:1 compression. I have the cam setting at 3 due to the amount of vaccum i am pulling 8-9 at idle. I started of with the cal setting at 2 and that seemed to work fine but though since my vaccum was lower i would put it in the 3rd level.
Quote from Austin DeHaas on November 17, 2022, 12:31 amYour log is too long. Try editing down to the problem area. I couldn’t get to it without the drive reloading the file.
You do have a lot of negative learn and trim is still large. What is you cam setting? What cam are you running? What is the engine?
i have attached the log snippet section. I just noticed also that this post is probably in the wrong section since its tuning related.
No worries on the section. I can always move it.
Cam specs would be helpful.