EFI cutting out / hesitating 2500 RPM

[jeev]

Hey Guys hopefully you can help.

Equipment: 66 Bronco 302 with GT-40 upper/ Lower, 19lb injectors, A9L computer, RJM EFI harness, painless elect harness, BC fuel tank with in tank pump.

Symptoms: I finished the conversion a month ago and all has been well. After about 100 miles I now get strong hesitation / missing off both banks of cylinders at 2200-2800 RPM then back to normal full power at 4500RPM.

I have tried everything I can think of and hit a wall, any ideas?

Thank you!

 

[Viperwolf1]

Get any codes?

 

[jeev]

Get any codes?

I just ordered a scanner today, the one I was using I had to give back....

 

[70_Steve]

I just ordered a scanner today, the one I was using I had to give back....

Buy a $5 test light at Autozone and count the flashes. That's what I'm doing and it works very well.
http://fordfuelinjection.com/?p=13

 

[66horse]

check your fuel filter and fuel pressure. Not usually the problem but it was for me for something very similar to what you are experiencing

 

[Broncobowsher]

My SWAG...
Jacked up MAF. Unplug it and put it in limp mode. See if it runs any better.

 

[gddyap]

I have similar symptoms and when I pulled codes I have a mem code 66 which is MAF related. I can't find my Probst book but I found some some things to check on the MAF and harness while searching.

 

[Bronco_69]

a bad TPS will also do that. use a meter and be sure you get a smooth sweep.

 

[jeev]

Thanks guys! Into the garage I go....