Help! I have a97 E super duty motorhome with the triton v10.
At first i had a bunch of codes saying lean bank1 and lean bank 2, as well the misfire codes on 3,6 and 8.
Changed the COP, same codes.
Changed plugs, same codes.
Changed PCV, same codes.
Changed fuel filter, both O2 sensors, same codes.
Changed DPFS, same codes.
Changed injectors, same codes.
Changed MAS, P171 and P174 went away, started running cinsideribly better. Still missfiring on 3,6 now 7 and 8.
Passed smog tho..
Hooked up vacuume gague to see if possible worn or broken valve springs.
Vacuume shows about 21" at idle, shoots to 0" then 25" and back to 21" when quickly rev'd. Needle vibrates about 1", (21" to 21.5/22").
Ive read this indicates vacuume leak..
I've sprayed starter fluid like crazy on all hoses i can see, no engine speed change..
Any thoughts are appreciated!