Campaign - Rough Idle, Low Idle, Idle Speed Fluctuates
86BMW09GROUP 13 Fuel Systems
Bulletin Number 13 13 86 (1211) Page 1 of 3
Montvale, NJ May 1986 Technical Dept.
SUBJECT: Engine Campaign Procedure
MODELS: 535i, 635CSi, 735i, L7 (1985-86 Model Year)
Condition: Idle speed fluctuations. Rough idle. Idle dips below specifications on deceleration.
Cause: Engine systems not updated to latest configuration.
Correction: Perform Engine Campaign Procedure as outlined in this Bulletin.
Campaign
Summary: Because of the interrelations of various components, it is very important to follow the procedure below. Details of these items are included in the next section of this Bulletin.
1. Check Ignition Components.
2. Check/Replace Pneumatic Purge Valve and Vacuum Delay Valve.
3. Check/idle Speed Regulating Valve.
4. Adjust Valve Clearance.
5. Reseal Electrical Connections of O2 Sensor.
6. Clean Fuel Injectors/Check A/C Freon Charge
7. Perform Engine Test with BMW Service Tester.
- Perform Engine Test
- Compare Nominal Value to Microfiche and Adjust if Necessary.
8. Perform Quality Control of Installed Systems and Road Test for Driveability Problems.
9. If Driveability Unsatisfactory, Clean Carbon from Intake Valves.
Campaign
Details: 1. CHECK IGNITION COMPONENTS.
- Remove, inspect and regap spark plugs (See S.I. 12 03 85 (1085)).
- Inspect ignition cables for visual signs of arcing. (See appropriate Repair Manual)
- Inspect Ignition Coil Cap Cover (See S.I. 12 02 85 (1071)).
2. CHECK/REPLACE PNEUMATIC PURGE VALVE AND VACUUM DELAY VALVE. Examine existing pneumatic purge valve. If no date code or if date code is F01 or lower, replace valve. Also install vacuum delay valve. See S.I. 13 05 85 (1048) for details.
3. CHECK/REPLACE IDLE SPEED REGULATING VALVE. Examine existing valve, if date code is before date code 452 replace valve. See S.I. 13 01 85 (972) for details.
4. ADJUST VALVE CLEARANCE. Adjust valve clearance to 0.30 mm cold engine - maximum coolant temperature 95~F/35~C) or 0.35 mm with engine fully warm.
5. RESEAL ELECTRICAL CONNECTIONS OF O2 SENSOR. Refer to S.I. 11 03 86 (1182) for details.
6. CLEAN FUEL INJECTORS. Refer to S.I. 13 08 86 (1176) for detailed procedure. CHECK A/C FREON CHARGE. Refer to S.I. 13 04 85 (1036) for details. Connect the Fuel Injector Cleaner as described in the above bulletin. Once you get to Step 10 of this S.I., do not run the engine at 3000 RPM as described. First run the engine at 2000 RPM and check the Freon of the A/C system as described in S.I. 13 04 85 (1036). Bleed if necessary. After you finish bleeding the A/C system continue the injector cleaning procedure as per Step 10 of S.I. 13 08 86 (1176): Increase the engine speed to 3000 RPM and keep it there until the engine starts to stumble steadily indicating it has used all the cleaning fluid.
7. PERFORM ENGINE TEST WITH BMW SERVICE TESTER.
- Perform Engine Test
- Compare nominal value to Microfiche and adjust if necessary.
8. PERFORM QUALITY CONTROL OF INSTALLED SYSTEMS AND ROAD TEST FOR DRIVEABILITY PROBLEMS.
9. IF DRIVEABILITY IS UNSATISFACTORY, CLEAN CARBON FROM INTAKE VALVES. Follow the Procedure in S.I. 11 10 85 (1011).
Warranty
Status: 1) Reimbursement for the complete repair outlined in this bulletin will be provided through normal Warranty claim processing with no limitation on age or mileage of the affected vehicle, only when this repair is performed in conjunction with and within the limits described in the BMW "86 ENGINE CAMPAIGN", and the repair is performed on or before May 31, 1987.
The "complete repair" must use the special defect code and labor operation number as detailed on the enclosed summary.
2) Any repairs or adjustments which are found to be necessary while performing the repairs outlined, but which are not included in this bulletin, will be covered under the terms of the applicable BMW Warranty only.
3) If a component installed as part of the "complete repair" requires subsequent (later) replacement, the required repair will be reimburseable ONLY under the normal BMW Limited Warranty for that particular item, using an applicable defect code (NOT thp"special defect code") and labor operation from the Flat Rate Manual.
SUMMARY OF UPDATES COVERED BY THE ENGINE CAMPAIGN 535i, 635CSi, 735i