88 F150 Flashing Check Engine Light

[bluebuick91]

Hey All,

I am having an issue with my check engine light flashing while I accelerate. If I let up on the gas it goes out, doesn't stay on, until I give it gas again then the flashing starts. It will start flashing at about 15-20 mph all the way up to 45 mph, then sometimes it will stop flashing, and sometimes it continues to flash as you go faster...My MPG has tanked to 8, before it was a decent 15, I pulled the codes 32, 44, 42

Not sure where to start, if you have any suggestions, let me know...

[dfordski]

Which codes are running & which codes are continuous mem.? Are any koeo ? what engine?

[bluebuick91]

5.0 EFI Auto 200,000+ still seems to run good, just really bad mileage and the blinking light. I was having a problem with the idle dropping really low almost to where you thought it was going to die, but then it picks up on it's own. The light was blinking then as well.

As far as the codes, they are continuous memory codes...koeo

[dfordski]

Is it the same behavior while warming up and after norm. oper. temp. is reached? KOEO(key on engine off) all codes mentioned posted w/o .engine running? What do you get for KOER(running)? I'd think there would be a o2 code too. What & when was the last work done on the truck?

[bluebuick91]

sometimes in the morning i have to rev it up because it loaps and runs like a race cam and the black smoke comes out after reving it up a little and i have changed the coolent temprature sencor under the intake vane.altinator went up in smoke ounce,changed stater,sylinoid,batt twice,brakes,oil+filter all the time,oil sending unit,power steering pump,thermostat,exhaust manifold on pass side twice,sounds like the drivers is going soon,plugs,wires,pvc hose found crack,smog canister on frame lower front charchol one,fixed the three plastic hoses from the can to intake smog pump upper vane.
and had a new flow master muffler 3 chamber put on the old muffler burnt out.

[bluebuick91]

sometimes in the morning i have to rev it up because it loaps and runs like a race cam and the black smoke comes out after reving it up a little and i have changed the coolent temprature sencor under the intake vane.altinator went up in smoke ounce,changed stater,sylinoid,batt twice,brakes,oil+filter all the time,oil sending unit,power steering pump,thermostat,exhaust manifold on pass side twice,sounds like the drivers is going soon,plugs,wires,pvc hose found crack,smog canister on frame lower front charchol one,fixed the three plastic hoses from the can to intake smog pump upper vane.
and had a new flow master muffler 3 chamber put on the old muffler burnt out.truck run great once it warms up just sucks fuel about 12 on highway outch with overdrive

[dfordski]

Sounds like a Vac system leak. Warm up the engine . Take a propane tourch and set flow to a 1 inch flame then blow out the flame. Run it along the Vac hoses, connections and componants. When you hit a leak point it will smooth out the idle.