# Group 12 Engine Electrical Service Bulletins.

#### Bulletin number

#### Title

#### Description

#### Date of issue

12 04 84 (863) | Improved secondary ignition components | Introduction of silicone cables | August 1984
12 05 84 (879) | Alternator Ground Strap | Can break, now secured to alternator with bolt rather than nut. Increased eyelet diameter, 5mm to 6mm | November 1984
12 07 84 (906) | Engine misfire | States to check and replace spark plugs on a regular basis to prevent misfire from lean fuel mixture and bad plugs | January 1985
12 09 84 (942) | Vehicle will not start 325e | Check for bad 50 amp fusible link, 6 inches from battery | January 1985
12 02 85 (1071) | Silicone Ignition coil caps | Replace as part of 86 Engine Campaign |
12 03 85 (1085) | Spark plug application chart for BMW vehicles | Contains a copy of spark plug application chart | April 1990
12 01 86 (1144) | Cold starting 325e produced before 10/85 | Incorrect position of cable on battery junction block | February 1986
12 02 86 (1188) | Alternator mounting bolt, 325e 12/85 - 2/86 | Lower pivot bolt head must be under 4mm or contact with alternator belt can occur, does not apply to rubber bushing mounted alternators. | March 1986
12 03 86 (1206) | Secondary ignition component upgrade, 318i to 10/83 | Replace wire set with silicone set as per 86 Engine Campaign |
12 04 86 (1241) | Starter Cable 325 | Starter cable may rub against brake booster, reposition | September 1986
12 05 86 (1251) | Wire connections to coil | Possible short from terminal 15 to coil cover | August 1986
12 02 87 (1447) | S14 transport plugs | Replace spark plugs with Bosch X5DC on delivery | August 1987
12 03 87 (1450) | Distributor rotor, M3 prior to 5/87 production | Misfire caused by bad ignition rotor. | August 1987
12 04 87( 1453) | M1.1 Motronic Control units, 325i and iC from 3/87 production | Information on labeling of DME control units | August 1987
12 01 88 (1574) | Moisture in O2 connector, E30 M20 Sep to Nov 87 | Incorrect sealing of G103, O2 connector near right shock tower, no heat shrink, seal with silicone | February 1988
12 02 88 (1584) | Ground strap from alternator to block, M3 to Dec 87 production | Replace brown ground strap with red strap, part number 12 52 1 312 124 | February 1988
12 05 88 (1638) | Ignition coil replacement | Replace coil if DME is replaced for output stage failure | May 1988
12 07 88 (1678) | Motronic M1.1 Circuit suppression | Insert diode harness to pin 12 C101 | January 1990
12 09 88 (1719) | Power train system repair notification | Request for diagnostic printouts of relevant repairs | May 1989
12 03 89 (1838) | High pressure engine steam cleaning | Don't do it, electrical connectors can't cope. | March 1989
12 05 89 (1862) | Moisture in C191 Multi-plug, M20 | As a result of high pressure washing, moisture gets into engine harness connector under manifold, replace harness on pre 5/88, remove and dry others. | June 1989
12 06 89 (1878) | DME M1.3 sensitivity E30 from 6/88 to 5/89 | Remove pin 18 from diagnostic connector - no longer valid, do not perform this procedure | May 1989
12 02 90 (3115) | Modified distributor cap and rotor M3 | New style distributor cap and rotor from 12/88 on, do not mix components, must be paired. | November 1990
12 01 91 (3202) | Engine test, ignition timing angle readout M3 | Unable to record timing from C152. Incorrectly wired, cut wires and install in correct positions in a new connector | May 1991
12 04 93 (3848) | Alternator overcharging | Check engine light for over voltage, replace voltage regulator | September 1993

E30 M3 Repair Manual V2.7. Copyright ©1999-2001 Koala Motorsport & Brett Anderson