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Old 05-17-2016, 08:15 PM   #1
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Misfire!

Misfire!
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.
P171
P174
P303
P306
P308
P353
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!
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Old 05-17-2016, 10:33 PM   #2
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I think you're on the right track checking for vacuum leaks. Extra air getting in to the intake could be what's causing the lean condition. If you can, get a vacuum hose diagram for your engine. It could be in the HVAC system, brake booster, or any number of places.
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Old 05-17-2016, 10:50 PM   #3
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Check pvc hose, including the elbow that comes out of the throttle body.
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