I've replaced just about all the sensors, checked fuel pressures, timing, and vacuums. I do not have a sticky egr, thermactors work great, only code I get is 111, system pass. I did find that the egr tube was cracked, not sure if hat could cause the o2 sensor to read lean do to escaping exhaust gasses and tell the PCM to richen fuel mixture. Truck doesn't like to run until it's warmed up. My new egr tube is on the way, but I'm at wits end with the thing, only other possibility is maybe my pcv valve? Please give a helping hand

 

Dual tanks? If so does it run the same on both tanks?
Any fuel in the vacuum line to the fuel pressure regulator or the charcoal canister?

 

My truck was doing this and it ended up being the fuel pressure regulator. But I have the 5.0 in mine.

 

Just some thoughts

If the crack in the egr could be letting in a little extra air, then the O2 sensor COULD possibly be demanding more fuel because it would seem to be lean -- this assumes that some of the flow could go the other way.

I'm surprised that it's not complaining about out of range fuel trims -- I think that was part of the first OBD systems.

Just one other thought -- could anything else be causing the smoke, or is it running poorly?

 

In your previous post on 7/29 you stated "i keep getting code 334", was that repaired?

 

yes, 334 fixed, it came on because i had the sensor out of the egr and whatnot. it will start up at first, rev to about 1600 and die, crank it a while and maybe a fire or two in the cylinders. but nothing to keep it running until you do this until it gets a little warm. it smokes very little when its warmed up, unless you throttle up on it. i pulled into the gas station with it running with a little high idle that its had for awhile, and i went pull out and it started boughing down and was instantly getting too much fuel like it is now.
once again, thanks for input guys

 

and my pressures remain perfect, FPR is also fine too.

 

What do you mean by perfect? What pressures are you getting and how do you know the fpr is ok?

 

fuel pressures were within specs (35-45 i think it was) and i vacuum tested the regulator and made sure when disconnected fuel pressure increases about 10psi. i also let the truck run with the pressure gauge connected for about 10 minutes and it stayed the same and never went above normal pressure.

 

So what about the dual tanks question?

 

pressure runs good on both tanks, ive gone through the entire fuel system a few months ago, new tanks and replaced pumps.

 

A cracked EGR tube will allow fresh air into the exhaust which will make the A/F ratio appear lean and the computer will then add more to compensate, so that could be your problem.

 

last time i drove it was about a week ago and it gave me HEGO indicates lean for a code. the engine light came on after a few miles and went off shortly after. it ran decent because it was warmed up but still smoked a little. today the ford dealer should have the egr tube so i'll let ya know how that works out.

 

get rid of that gutless 351 and put a cummins or powerstroke in it, problem solved

 

new egr tube didnt help. she still doesnt want to start, just a lot of smoke and a few pops here and there.

let me recheck, The timing plate has a sight glass, a little notch, and a straight edge off to the right. im supposed to time it off of the right edge right????