Question about 2002 BMW 5 Series
Hey Polo. once you get the manual, read it.. read it and read it,, know it before you start.. take pictures of everything.. close-ups.. mark or identify every hose, line, connection...you can get "paint" markers" at hobby stores.. (I keep numerous colors in my shop at all times!) .just a dot of paint on a hose and on the connection will make reassembly so much easier!! Use one dot, ..then a two dot..so on.. get DIFFERENT colors.. TAKE YOUR TIME..you can get some containers.. put the bolts/parts to the fuel injection system and air filter in one, the nuts, bolts, parts to the intake in another, the parts and pieces to the coolant system in another.. (ORGANIZATION!!).. all this wil make reassembly SO MUCH easier!! make sure you clean ALL gasket surfaces with a wire brush and NON-CHLORINATED brake cleaner.. use Permatex spray gasket sealer..(NOT SILICON!!). CLEAN gasket surfaces REDUCE the slightest chance of leakage!!
When you are retightening all the nuts and bolts, make sure you use a criss-cross tightening pattern. this should be covered in your manual..do not tighten the manifold bolts/nuts down to final torque the first time.. snug ALL first, then final tightening.. USE A TORQUE WRENCH!! IMPORTANT!!!!!
This is what I use:
Permatex 80064 High Tack Spray Gasket Sealant 4 Ounce Aerosol Can Walmart...
You can do this ...
Posted on Jul 17, 2017
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Posted on Jan 02, 2017
O171 MAF (Mass Airflow Sensor) Just try cleaning this part it usually solves that problem without having to buy new part.
0174 Both are mass air flow sensors. The other problem can be a vacuum leak Check PCV valave and all vacuum lines. Also make sure fuel filter and fuel pump are working correctly. You can clean the MAF with some brake cleaner make sure it is dry before you install it back
Posted on May 28, 2009
P0313 - Misfire Detected with Low Fuel
P0174 -System too Lean (Bank 2).
P0171 -System too Lean (Bank 1).
P0171 and P0174 mean "system too lean" for banks 1
Posted on Oct 21, 2010
yes its got a gasket so mi gather you think its leaking?
you can spray soapy water on the [cold] engine to see if & where its bubbling which indictes a leak!
Posted on Aug 15, 2009
SOURCE: p0171 and p0174 codes
P0171 System too Lean (Bank 1)
P0174 System too Lean (Bank 2)
If a car has a check engine light on and has P0171 and P0174 codes stored, the most likely cause is a vacuum leak. These codes are set by the car’s computer when it sees too much oxygen in the exhaust. Excessive oxygen readings in the exhaust will set lean codes. This does not mean that the oxygen sensors are defective. It is a common mistake for people to replace oxygen sensors when lean codes are present. Just because the code is related to oxygen sensor readings, it doesn’t mean that the oxygen sensors are bad. If both of these codes are stored this means that both banks of the engine have excessive oxygen in the exhaust. If the oxygen sensors are replaced it’s most likely that the same codes will reappear. It is very uncommon for two oxygen sensors to fail at the same time.
Therefore the most likely cause of P0171 and P0174 codes is a vacuum leak. The source of a vacuum leak can be one of many things. The most common cause of a vacuum leak is a leaky hose. Vacuum hoses over time can become dry and brittle. The rubber deteriorates and can leak causing a vacuum loss. Many times a leaky vacuum hose can be found by listening for a hissing sound. A large vacuum leak can even make the car run rough at idle. In some cases it will not idle without feathering the gas pedal.
Posted on Sep 10, 2009
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Removal & Installation
Disconnect the Negative battery cable Relieve the fuel system pressure (you can do this by placing a rag over the schrader valve on the fuel rail and pressing in the valve stem--just be careful not to spray fuel on your eyes). Drain the cooling system. Remove or disconnect the following:
Relieve the fuel system pressure (you can do this by placing a rag over the schrader valve on the fuel rail and pressing in the valve stem--just be careful not to spray fuel on your eyes).
Drain the cooling system.
Remove or disconnect the following:
Remove or disconnect the following:
Starter electrical connectors Starter motor
Fig. View of starter motor removal and wires
Install or connect the following:
Fig. Intake manifold torque sequence- 4.6L engines
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