New to FTE, but not to the world of wrenching.
Having 1998 Ranger 4.0 problems. I have a post under Ranger forums. P0171,P0174 and P0303. Username is ggaiii.
Ive replaced upper manifold gaskets (3) and fuel rail gasket and the coil pack.
I still have the codes like I didnt do any work at all.
Just wondering if there is a more experienced wrench jockey that may have some time ? I'm into computers can can trade some work on them, buy lunch, beer or whatever. Just dont have alot of disposable cash.
If not thats kool, Great site and hope someone answers >>
Have you replaced all of your vacuum lines? A single vacuum line leak may be small, but the cumulative effect can be significant. If you have a bunch of hardened or cracked vacuum lines, it may create a significant enough leak to easily set those codes, all of which point to a lean condition.
Two of those codes say lean or rich, so to eliminate rich, pull a spark plug and see if it has dry, chalky, black soot on it. If not, then your problem is most likely a lean running condition.
You may also need fuel injector service. If your injectors have never been cleaned and you don't regularly run a fuel additive, you could have a clogged or fouled fuel injector (or three)
Poor fuel system pressure could also cause a lean running condition.
If you are running lean, you should try to correct the problem soon. Lean conditions cause excessive combustion chamber heat which can cause piston failure.