I agree with Bluegrass7....just take it one step at a time brother....

 

the codes are po171 and po174 sytem to lean
also my stft b1(%)11.7stft b2(%)14.1 ltft b1(%)29.7 ltft b2(%)29.7
with my rpms at 1457
it also says my fuel sys1 CL and fuel sys2 NA
i have tried checking and checking but find nothing at the minute
thank you guys for all the help i know i am getting frustrated with myself
just it is annoying that i cant find the leak
would replaceing the pcv valve possibly work
also some of the hoses around the fuel tank are a little rotten would this be a suspect to


many thank wilky

 

Check your air intake tube between the throttle body and the air filter...also your hard plastic vaccum lines as well.....use carb cleaner while its running an spray the lines and see if you hear an idle difference, that will show you a leak too...

 

Wilky69,
It's NOT a difficult problem to solve. Just do what others suggest.

 

+1 to Parker...we are all just here to help bro, and some of these issues like this just take a little time and patience to find and figure out

 

I'm having a similar problem...
Does yours make a bellowing sound thru the air intake tube that coincides with the idle surges? I took the air filter out and it is definitely coming from the throttle body.
I'm getting the too lean on both cylinder banks code also.
I've checked all the hoses, replaced the fuel filter, air filter, IAC, and now it seems even worse.
Fuel pressure is low. 40psi, when it should be 50psi.
I can't afford the time to mess with it, so I'm calling in to work and taking it to the shop tomorrow. I'm thinking fuel pump. Seems every Ford I've owned has had the fuel pump go out at 100,000 miles.

 

Well no, 50 psi is to high on rail pressure.
It has to be vairable between about 35 and about 40 psi according to intake vacuum levels.
Some background on this is as follows;
Injector flow rate is based on 38 psi for rated flow in pounds per hour of fuel.
If you were to raise the pressure, the injectors would flow more fuel.
At idle the intake vacuum pulls on the regulator to lower the fuel below because at idle the motor can't use that much fuel.

 

hi again well i checked over the vacuum hoses again and checked the plastic hose to the intake and no leaks i checked with carb cleaner
i replaced the pcv valve as i head if you can blow through it in both directions it was bad i could so i replaced it (i was planning on this anyways i took it for a drive around the block and the light come back on with the same codes i am getting my neighbour to come look at it tommorow night i think i can hear a small whistle but cant pin point it due to the fan also could it be my fuel pump as my truck has 174k on it if the fuel pump is a suspect how do i test it


many thanks wilky

 

My Chiltons may have said 50psi with vacuum applied now that I think about it. Sorry.

 

whether is is 35-40 or 50 psi depends on how your pressure is regulated. On older vehicles with a mechanical fuel pressure regulator, the lower 35-40 psi is correct. But on a newer pulse width modulated system, they run at higher pressures, typically around 50 psi. They still have a vacuum reference, but it uses a switch or sensor to regulate the fuel pressure. The pulse width modulated systems are also more commonly known as returnless fuel systems, because they do not bleed excess pressure back to the fuel tank.

 

Shop thinks IAC I got is defective. They unplugged it, and the sound went away.
Local dealer is getting a Motorcraft one in today. We'll see if that's the problem.
They did look over all the hoses and couldn't find any on mine that were bad.

 

Replaced with Ford IAC. Same problem... Back to the shop.

 

Well. After much frustration, we thought maybe a piece of the old IAC diaphram fell down into the throttlebody / intake. Upon removing the upper intake/throttlebody, I found the 90deg. hose elbow on the back of the throttlebody was toast. It had a huge gaping hole. It appears to be a pcv hose, but I don't see a pcv valve anywhere... I'm not sure why it was affected by the IAC, but I'm off to the parts store... on my bike... to get some gaskets, and a new hose or two.
Also broke one of the bolts off on the EGR... That'll be fun to get out.

 

If you positively found an air leak from a rotted hose that you failed to see before, i'm sure you finally found the source.
This is why we kept bringing you back to an air leak.
One thing that happens with this kind of fault is when you decellerate the motor under the weight of the vehichle, the intake vacuum goes as high as 22 inches.
With this amount of vacuum, it sucks the fault open and draws air in, the system still detects. At idle, the fault is still there but may not be quite as affecting.
On the fuel pressure, when I reply as I did, it is assumed/known the 97 to 03 truck systems are all two pipe feed and return, on the trucks. Cars and other models phased in the single pipe systems before the trucks got it.
Two of the reasons for going to single pipe system is less full evaporation and volitility in the tank, from circulation, easier control for flex fuel changes between fuel additions. Sensors in the single fuel line systems detects these changes and controls fuel feed as well as changes in the PCM program to better utilize the change in the fuel make up by design, knowing what is likely to be used from normal market sources.
In this year range 97 to 03 at least, the use of alky fuels in lue of gas with added Ethonal often results in CEL lamp because the system cannot adapt to those fuels like the later fuel system designs.
Good luck.

 

Replaced the hose, and put evreything back together with new gaskets.
Noise is still there, but it's not surging at idle.
Pulled the PCV valve, and blew thru it in both directions. Going to replace that now and see if the truck is finally %100 again.