1997 BMW 740 Repair Question
Topics covered: Engine, Air pump, Cylinder head.
Mileage: No information provided.
Mileage: No information provided.
Asked on August 23, 2010
1997 BMW 740 air injection failure
Engine Performance problem
1997 BMW 740 V8 Two Wheel Drive Automatic 155792 miles
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?
1997 BMW 740 V8 Two Wheel Drive Automatic 155792 miles
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?
Asked by manuel.espinosaAnswer
Replied on August 23, 2010
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?
Replied on August 23, 2010
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.