Changed the fuel pump, plugs, intake manifold gasket, injectors pretty much everything I can think of nothing has worked can you help
This is a vacuum leak causing the oxygen sensors to throw codes or its both sensors or you have an exhaust leak before the sensorsyou say you changed the intake manifold gasket did you change upper plenum and the lower intake or just the top? Ok let's try this take fuel injection cleaner and spray around the intake upper and lower while in drive foot on the brake if the idle changes the leak is there do the same for all vacuum lines
SOURCE: TOO LEAN CODES
yes very very common code for these motors i get them all the time. now the first thing i do is listen to the pcv valve for noise if it is rattling this is the problem and is the most common of all. another thing is the intakes leak from cracks in them but the only way to find it is with a smoke machine. now the one other thing i have seen before is debre like a leaf in the mass air flow sensor but you have replaced it so most likely no that.
do your self a favor and change the pcv valve it only cost under 5 dollars. if this is not it you will need to find the leak in and around the intake or a vacuum hose.
because you have two lean banks this mean if it is a leak then it has to be in common with both banks and that is the vacuum line system intake etc...
let mew know if you have any more question. good luck man
SOURCE: ford explorer ,4 litre. have code of P0171
You could be right but before going to all that trouble of replacing the intake gasket take a close look at the MAF (Mass Air Flow) sensor. Also look for a vacuum leak downstream of the MAF sensor. The MAF sensor may be dirty especially if you are using an "oiled" air filter and it was over oiled. Remove the MAF sensor and clean it with electronic cleaner. Make sure it is dry before reinstalling. If it is damaged, replace it. Also replace the fuel filter as a partially clogged filter has been know to set this code on some vehicles. Check all vacuum hoses and replace as necessary.
SOURCE: im throwing code p0171 bank
Your problem is the mass air flow sensor is bad theat code is miss leading a p0171 and p0174 are both miss leading replace the mass air flow sensor and clear the codes.
How many km are on this car I would go to muffler shop and do back pressure test it only costs 10$ to me it sounds like a bad cat to me
SOURCE: 1998 ford explorer 4 5 6 cyl. misfire
Hi:
A code P0304 - 305 or 306 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer
Possible Solutions:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating,
check all wiring and connectors that lead to the cylinders (i.e. spark
plugs). Depending on how long the ignition components have been in the
car, it may be a good idea to replace them as part of your regular
maintenance schedule. I would suggest spark plugs, spark plug wires,
distributor cap, and rotor (if applicable). Otherwise, check the coils
(a.k.a. coil packs). In some cases, the catalytic converter has gone
bad. If you smell rotten eggs in the exhaust, your cat converter needs
to be replaced. I've also heard in other cases the problems were faulty
fuel injectors.
Hope this helps; also keep in mind that your feedback is important
and I`ll appreciate your time and consideration if you leave some
testimonial comment about this answer.
Thank you for using FixYa, have a nice day.
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