BMW Fuel Injection System Service
Deposits found in the injection and induction system may cause the vehicle to experience a variety
of driveability complaints eventually leading to the Service Engine Soon Lamp to be illuminated.
Some of the possibilities are listed below.
Fuel Injectors: Deposits at the fuel injector's tip can impact fuel flow disturbing the air/fuel mixture ratio. Symptoms: Hesitation or stumble during acceleration, even loss of power. Poor fuel efficiency. Increased emissions of HC and CO. "Service Engine Soon" light illumination due to misfire faults, or lean mixture adaptations. Intake Valves: Deposits at the valves and on the intake manifold ports can absorb fuel during the warm-up phase, leaning out the air/fuel mixture ratio. Carbon build-up may disturb mixture flow at low throttle conditions/idle speeds. Symptoms: Poor driveability, loss of power, unstable/rough idle, increased emissions of HC, CO and NOx. "Service Engine Soon" light illumination due to intermittent misfire faults. Combustion Chamber: Combustion Chamber Deposit Interference, or CCDI, occurs when there is a contact between carbon deposits on the piston crown and cylinder head. The noise can be confused or misdiagnosed as ping, knock or other noises that could indicate a mechanical failure. CCDI occurs first as a cold start noise that can fade as the engine warms to operating temperature. The noise will reoccur at the next cold start. As deposits build, there is an increase in compression temperature that may cause pre-ignition detonations. Symptoms: Knocking, pinging, run-on, poor acceleration, octane requirement increase, increased emissions of NOx, engine idle speed surges. Depending on the manufacturer, fuels may contain various additives such as: oxidation and corrosion inhibitors, metal deactivators, emulsifiers, anti-icing agents & dyes, plus they are required to include some form of an intake system deposit control package. Unfortunately, not all fuels are created equal, and some additive packages are not effective enough to maintain integrity of the intake systems in high performance engines, or engines operating in severe environmental conditions. Even worse, the intake system deposit control additives in some fuels may actually contribute to the combustion chamber deposits accumulation, and to the problems associated with those deposits: knock, run-on and increased emissions of oxides of nitrogen. To remedy these complaints BMW has developed a new special tool and cleaner concentrate to clean the fuel injectors, induction system and combustion chamber of harmful deposits. This service is available for only $149.95 plus tax. If your BMW seems to have any of these symptoms then make a Service Reservation today to have a fuel system cleaning performed. |
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Throttle Plate / Air Intake
Deposits result from recirculated exhaust gases and crankcase vapors vented into the air intake. Deposit build-up on the throttle plate can lead to poor throttle response and idle quality. |
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Fuel Injectors
Deposits can impact fuel flow, upsetting the air / fuel mixture. You can experience hesitation or stumble during acceleration, even loss of power, increased emission of hydrocarbons and carbon monoxide. |
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Intake Valves
Deposits can absorb fuel during engine warm-up, leaning out the air / fuel mixture, and leading to poor driveability, even loss of power and increased emissions. |
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Combustion Chamber
Deposits can lead to auto-ignition of the air / fuel mixture which causes knocking, pinging, run-on, poor acceleration, and increased emissions of nitrogen oxides. |