Golden Jubilee
Posts: 2028
Joined: Fri Apr 08, 2016 4:52 pm
Re: Ford Power Stroke Woes
Test drive reveals sluggish acceleration, huge hesitation, code 44 lean exhaust. Scanning data shows sensors all in line OK but blocklearn is 158. 128 is middle of the road. This is definitely an "add fuel" situation.
Since truck seems to idle great I decide to check fuel pressure. It turns out to be low at about 8psi. Spec is 10-13 psi on GM TBI on trucks, 4.3l, 5.0l,5.7l.
You have to remove fuel filter and install an adaptor to check fuel pressure.
I always repace fuel filter going back together. I think it needs a fuel pump.