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Old 11-13-2012, 04:59 PM   #5
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 19,497
My Ride: 330CiC, M5, X5
Smoke test, spray brake cleaner, mechanics stethoscope with the transducer removed and extending the hose to listen for vacuum leaks.

But except for crack valve cover or bad valve cover and a few other odd things a visual inspection is really the best solution. You WILL find problems visually inspecting the obvious culprits and you will likely find other problems as well.
Solve your misfires, lean codes, rough idle -

Fuel pump failures -

Temp Info -

Hidden OBC Menu - Check Voltage, Temp, Fuel Level -

E46/E39 GM5 Door Lock Info -

Lower hose temp switch O-ring - BMW #13621743299
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