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unfortunately the 3.0 have high rate of failures in all the intake hoses and throttle body mini hoses as the 15 year mark. You can have the vehicle "smoked tested" which is a fancy word for pressurizing the intake and engine block and looking for escaping smoke. Most are the oil separator vacuum (CVCC) lines, cam cover gaskets (This engine is pressurized when running), etc.
DISA valve is another source of concern on this application. See DISA Death rattle
On the gas cap, the issue will it hold a vacuum when applied. Testing the cap with a pump is the method as the seal is internal. Cheap part. The code only knows that when the gas vapor pump runs the line does not hold a predetermined vac level. Is it a line to the tank? The fuel vapor canister and or lines? testing we will go.....
On the O2 sensors, they read a value between two points (Lean - rich) and count the rich/lean cycles. If there "extra" oxygen source upstream (intake side), the engine will run lean always and trip a O2 sensor code. As posted reading the mixture values (fuel trim) will show constant effort of the engine management system to en richen without success. You can read the cross counts live on the Foxwell unit.
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2005 X5 4.8IS
The Blue ones are always FASTER....
Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green
Last edited by StephenVA; 03-14-2019 at 02:51 PM.
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