1997 BMW 740 air injection failure

1997 BMW 740
155,792 MILES • V8 • 2WD • AUTOMATIC
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MANUEL.ESPINOSA
  • MEMBER
  • 2 POSTS
A failed smog check with the air injection result showing FAILED and faults codes showing MISFIRE DETECTED for CYLINDER#3, #6, #5, #2. how can this be repaired? are these multiple problems?
Aug 23, 2010 at 5:40 AM
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DOCHAGERTY
  • ✓Experienced Mechanic
  • 9,606 POSTS
I believe there is more than one thing going on here. The air injection could be several things from a dead air pump to a broken vacuum hose to plugged passages inside the cylinder heads. The misfire faults could be due to intake manifold vacuum leaks or it could have just run out/low on fuel. Are you going to repair the car or have it done?
Aug 23, 2010 at 7:25 AM
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MANUEL.ESPINOSA
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  • 2 POSTS
I would like to do the work myself, although if having to open engine I will have to get a Pro. to do any major work. Does the air intake valve fail because of dirt build up? I will fill the fuel tank and new fuel filter, is the gas fuel fillter easy enough to access for changing out?
thanks for your help.
Aug 23, 2010 at 9:16 AM
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