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Old 08-05-2011, 01:50   #1 (permalink)
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2007 E350 5.4 misfiring/sputtering above 3k rpm

Before I spend more money into the van basicly just want diag steps to pin point exactly what is wrong.

The Van started lack of power at above 3k rpm and misfires can be heard and felt. checked for codes found p0305/p0306.....went to the dealer, dealer says veh needs coils for 5 and 6. Also advised a tune up since it has 109k. Since I know my way around a engine I decline the repair, buy the parts, and get to work.
replaced:
coil packs for 5/6
all 8 spark plugs
pcv valve
fuel filter

started the van, noticed the van would not rev pasted 3k rpm in park. test drove, first time above 3k rpm under load misfire was felt flashing check engine on then stay on. checked codes p0305 came up. figured I would swap injectors from 5 to 6. cleared codes. test drove the van again under load above 3krpm and it started misfiring, p0306 came up. Thought the problem was figured out bad injector. Installed 1 oem injector for 6. test drove veh, same thing under load 3k rpm misfire. scanned veh p0305. now completely confused, moved the new injector from 6 to 5. put the veh back together and drove it. again underload at above 3k rpm misfire again p0305. so number 5 has new injector,plug,coil.
Read in another forum about cats melting blocking exhaust flow. What is the life span of the cats on the truck? I know my cars manual say the cats only lasts 100k miles, butr the car has 175k without a problem.Is there a way to test this? Is there anything I am overlooking for me to check? I am at my wits end, any opinion or input would be great. Thanks in advance.
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Old 08-05-2011, 06:44   #2 (permalink)
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Re: 2007 E350 5.4 misfiring/sputtering above 3k rpm

ok so this is what I came up with first, I am gonna do a compression test (which the dealer did a relative compression test whatever that is) to see if 5/6 are any different from 1/2. i already checked the wiring (and the dealer ship said they did too which I don't believe), but I am going to check again.
That only leaves me with two options if everything checks out......either air restriction ( which I would think would throw a bank 2 lean fault) or a restricted exhaust (which I would think would throw more then just one misfire). Please any input at this point I will do. I need the van for work and hopefully will get it going and what I need this weekend.
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Old 08-05-2011, 09:15   #3 (permalink)
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Re: 2007 E350 5.4 misfiring/sputtering above 3k rpm

Not familar with that engine but rather than drop exhaust to eliminate possible blockage , if you temp removed the o2 sensor thats before the cat , giving the exhaust an escape and see if it revs ok then? Any cars I've had with a blocked exhaust were always running rich .
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Old 08-09-2011, 17:24   #4 (permalink)
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Re: 2007 E350 5.4 misfiring/sputtering above 3k rpm

took your advise about the pre o2 sensor removal, was affraid that the truck would not run correct since the o2 sensor were out. but it just faulted the o2 sensors and went to a generic fuel map. truck run with ful power.

got a new y pipe, installed, problem fixed. I just want to know wtf caused the cats to go bad. I am thinking of replacing the 6 coils and 7 injectors left that were not replaced since they were cheap to begin with
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