Engine - Poor Driveability In Bad Weather Conditions: Overview
86BMW04GROUP 11 Engine
Bulletin Number 11 03 86 (1182) Page 1 of 5
Montvale, NJ April 1986 Technical Dept.
SUBJECT: Oxygen Sensor
MODELS: 535i, 635CSi, 735i (1985, 1986 Model Years)
Complaint: Poor driveability under adverse weather conditions.
Cause: Under extreme snowy weather conditions with salt being used, slush or salt water can reach the oxygen sensor and an electrolytic bridging of the contacts can occur. This can influence the proper functioning of the oxygen sensor and the driveability of the vehicle.
This is only a temporary condition, which corrects itself when the contacts become dry again.
Situation: Corrective measures have been implemented in production, beginning in the last week of November, 1985. These measures are included in vehicles with a number higher than the following:
Model Chassis Number
535i 096 1544
535iA 066 8795
635CSi 060 7090
735CSiA 061 2738
735iA 097 6474
L7 109 0269
Correction: The 535i and 635CSi require "resealing" of the electrical connections and installation of a "splash shield" (as outlined in Attachment II).
The 735i and L7 require the same "resealing" and "splash shield", plus a rerouting of the oxygen sensor wiring harness. Complete procedures are outlined in Attachment 1.
Parts
Information: Part Number Description
11 12 1 262 571 Sealing paste: One tube should be sufficient for
3 vehicles.
11 78 1 278 560 Cover ("splash shield")
61 13 1 243 092 Wire tie
Warranty
Status: Parts and labor reimburseable under the provisions of the BMW 5 Year/50,000 Mile Emissions Warranty.
Defect code: 11 78 00 79 00
Labor allowance: 3 FRU
Labor operation: 00 50 550