Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU1999LEGACY L SEDAN AWD F4-2.2L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULETECHNICAL SERVICE BULLETINSCUSTOMER INTERESTAIR CLEANER CHAMBER - STALLING, MIL ON, BACKFIRE
1999 Subaru Legacy L Sedan AWD F4-2.2L SOHC
Air Cleaner Chamber - Stalling, MIL ON, Backfire
1999 Subaru Legacy L Sedan AWD F4-2.2L SOHCSECTION Air Cleaner Chamber - Stalling, MIL ON, Backfire
NUMBER: 11-5900
DATE: 02/25/00
APPLICABILITY:
1999 Legacy, Impreza, Forester
SUBJECT:
Air Intake Chamber Box Breakage
If you should encounter one of the applicable vehicles with a damaged Air Intake Box, please refer to the information below. Symptoms that occur on a vehicle with a damaged Air Intake Box may include, but are not limited to, "start-up and stall" or "check engine" warning light activation.
Additionally, the customer may have noticed a backfire during a cold start, with a partially open throttle. It will be necessary to inspect the air intake chamber and related parts. (See Figure 1). Replacement parts are available through normal parts distribution channels.
There are two different modifications to correct this condition. It will be necessary to read all of the following information before ordering any modified parts. Some of the vehicles may require an ECM and an Air Filter, while other vehicles may only require the ECM.
1) Installing an Air Filter into the Air Intake Chamber (Part Number: 16546AA070).
The Air Filter will not require regular replacement unless it is removed for some other reason in the future. (See Chart 1).
The above chart indicates the starting VIN numbers for vehicles with Air Filters installed during original production into the Air intake Chamber.
Note:
If the vehicle you are working on has a VIN number listed before the VIN numbers in Chart 1, it will be necessary to install an Air Filter.
2) Install a Modified ECU.
Please refer to Chart 2 shown for the correct ECU part number that will be needed for installation.
Note:
The only vehicles that had the modified control unit installed during production were as shown.
DISCLAIMER
DATE: 02/25/00
APPLICABILITY:
1999 Legacy, Impreza, Forester
SUBJECT:
Air Intake Chamber Box Breakage
If you should encounter one of the applicable vehicles with a damaged Air Intake Box, please refer to the information below. Symptoms that occur on a vehicle with a damaged Air Intake Box may include, but are not limited to, "start-up and stall" or "check engine" warning light activation.
Additionally, the customer may have noticed a backfire during a cold start, with a partially open throttle. It will be necessary to inspect the air intake chamber and related parts. (See Figure 1). Replacement parts are available through normal parts distribution channels.
There are two different modifications to correct this condition. It will be necessary to read all of the following information before ordering any modified parts. Some of the vehicles may require an ECM and an Air Filter, while other vehicles may only require the ECM.
1) Installing an Air Filter into the Air Intake Chamber (Part Number: 16546AA070).
The Air Filter will not require regular replacement unless it is removed for some other reason in the future. (See Chart 1).
The above chart indicates the starting VIN numbers for vehicles with Air Filters installed during original production into the Air intake Chamber.
Note:
If the vehicle you are working on has a VIN number listed before the VIN numbers in Chart 1, it will be necessary to install an Air Filter.
2) Install a Modified ECU.
Please refer to Chart 2 shown for the correct ECU part number that will be needed for installation.
Note:
The only vehicles that had the modified control unit installed during production were as shown.
DISCLAIMER
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.