I have a 5.4l 3v that just started missing at low rpms. At higher rpms I have not ntoiced it missing yet. I am getting the following codes....Missfire 6 & 8 and Fuel Rail 2 lean. The engine only has 75,000 miles, but the intake has 180,000 miles (2nd engine in truck....i reused the intake). I replaced the coils on 6 and 8 with no improvement. Any suggestions?

Could the PCV valve heater cause this problem?

Thanks

 

What are the codes?

 

Year of truck would also be nice.....

IDT that its related to to the pcv heating system.....

 

2004 truck with a 2007 engine (5.4l 3v.....intake is from the 2004 engine). The codes i am geeting are P0174, P0306, and P0308.

Thanks,

 

Start by getting new coil on plugs....cheapest is on ebay...global or uneek.....get a set for the v10 then you'll have a couple of spares....but if you need them right away then goto the dealer or autoparts store and they're going to hose ya......

 

i already replaced the coils on cylinders 6 and 8.