In an explorer, it wont rev over 2100 rpm in neutral, in gear it wont go over 15-20 mph more it is driven the worse it gets...throws code saying bank 1 lean, bank 2 lean, cyl 1 mis, cyl 4 mis.

Any ideas?

 

What are the code #'s and are they KOEO, KOER and/or CM? Have you checked fuel pressure? What year is it?

 

dont know if they are KOEO, KOER OR CM i used autozones code reader...
the codes were 0301 (cly 1 misfire) 0304 (cyl 4 misfire) --- (not 100% sure about these two 0701 (bank 1 too lean) 0702 (bank 2 too lean)
no I havent checked the fuel pressure...I dont have a way to
im going to put a new fuel filter on it and keep my fingers crossed...whats the difference between the 3 code types you asked about..?

 

I was thinking cat. converter. Anyone?????

 

Anyone have any ideas on this?

 

KOEO, KOER, and CM codes are EEC-IV designations for the types of codes the computer can output. I don't know if they carry over to EEC-V. You never did say what year Explorer you have, but, from the code numbers you gave, I would assume you have a '96-'00 (or whenever Ford dropped the OHV from the Explorer lineup) EEC-V. In any case, each code has a designated diagnostic tree associated with it. The code reader doesn't have this information, you need to get a good manual (many public libraries have these) which can tell how to diagnose these systematically. I'm not real familiar with EEC-V, so I can't really help you other than in generalities.

One thing I can say, is that those codes could be consistent with low fuel pressure (as has been suggested). Earlier models used a return-type system (which I'm familiar with), later models used a returnless system (which I have never seen). Not sure which year they switched (think it was '98), but another reason why knowing which year you have will help us. Testing the fuel pressure on the return-type is pretty easy. Get a fuel pressure gauge (most parts stores will carry these for $30-$50), attach it to the Schrader valve (looks like a tire valve) on the fuel rail, and test the fuel pressure.

 

Check the mass air meter to make sure it has no obstructions and make sure it has a good electrical connection. Had a similar problem on a mustang. A small piece of trash was stuck to the hot wire in the sampling chamber. Without a proper air volume reading (air mass), the PCM has no way of knowing how to schedule fuel and reverts to a fail safe mode - it schedules fuel for idle.


cds

 

Im sorry, its a '99. Dont know why I didnt mention that

 

I have a 2006 e450 with a 6.0 engine . This truck is slow and only gets 40 km/h and 2400 rpm .i plugged in the obd 2 and it gave me codes 0301 and 0701 . Can anyone here help me please .

 

There is a specific forum for the 6.0 diesel. I would post your question there and I think you will get an answer much faster.