Before the misfire was happening. i put 2 oxygen sensors on because two codes came up. p0171 p0174 both to lean. part store said oxygen sensors so i bought two and put them on had the codes cleared it passed the e check but the light came back on reading the same codes.i had my spark plugs and wires changed before winter.i do have an exhaust leak somewhere around the converter.also in the really hot days the truck makes a loud howling noise when the engine is at operating temp and idling.and just recently code p0304 cylinder 4 misfire is showing up as well as the two other codes can u please help me fix it
If you are mechanically inclined make sure the number four wire is tight at both ends. at the spark plug end see if you can wiggle the plug, make sure it is tight and gapped properly.
Testimonial: "thanks i will try that. do you have any suggestions on why the p0171 and p0174 codes came back even after changing two of the three oxygen sensors?also why does it howl in the hot summer days at an idle"
SOURCE: Code #P0171 & code #P0174
The most common problem on a Ford with these codes is deteriorated PCV hoses. Check the hoses from the PCV valve to the intake manifold. Pay special attention to the rubber elbows. They often crack on the inside curve and the crack is hard to see.
SOURCE: Code #P0171 & code #P0174
The intake manifold gaskets need replacement as well as the o-rings inside - if you call FORD they should be able to get you the correct parts.
SOURCE: 98 E-250 Rough Idle; codes p0156,p1131,p1151,p0301,p0171,p0174+
po301 thru po306 all misfire codes cylinder 1-6 remove plugs and replace them..... set the plug gap first
i suggest u replace the wires also if they never been replaced all these misfire codes can set the others and one is for the oxygen sensor ( 02s or HO2S) CIRCUT MALFUNCTION do u know how to check wireing systems
do the tune up plugs (set gap) .052-.056 change the fuel filter also. clear the codes hows it run
this info is for 98 E-250 4.2Litre
what engine do u have 4.2L or 4.6L i know it is a v-6 by the codes
System Too Lean (Bank 2)
Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust.
Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.
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Thanks.
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