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7 Series (E23, E32, E38, E65, E66) General discussion and technical help for all year 7 series cars.

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Old 03-13-2007, 07:42 PM   #1
RobTheOgre

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86 735i stuck in 3rd gear

i have a 86 735i the battery went dead after a long weekend away with my roommate (due to me leaving my radar detector on) I took the battery out charged it and put it back in ever sence then the mode selector switch just springs back to economy when i try to change it and i only have reverse and 3rd gear. i read the owners man and it says it due to an electrical malfunction but i dont even know where to begin to look for what is wrong/how to fix it.. any help i can get would be greatly appreciated

Thank you in advance
Rob "the Ogre" Schleben
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Old 03-13-2007, 11:37 PM   #2
Numark318i
 
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I know my transmission in the 330 has a fail safe, and when somethigns wrong it wont shift above 3rd gear.

Maybe its the same in the 735, maybe the switch in the transmission went out somehow?

try to disconnect and reconnect the battery?
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Old 03-13-2007, 11:58 PM   #3
RobTheOgre

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i have tried disconnecting the batt and reconnecting it multiple times and it didnt help
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Old 03-15-2007, 08:29 PM   #4
e23vance

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Pull the front passenger side speaker cover off and see if there is a relay attached to it. Have someone crank the car while you are touching the relay and see if it clicks twice.

Vance
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Old 03-18-2007, 08:46 AM   #5
e23vance

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One other thing. If the battery was dead, the batteries in your SI board may be kaput. This will cause the "limp-home" condition you have.

Vance
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Old 03-23-2007, 01:54 AM   #6
RobTheOgre

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if it helps diagnos the problem i hear a constant clicking coming from the trans computer (behind drivers side speaker cover). i will check said relay, is the two clicks a good thing or a bad thing
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Old 07-30-2007, 02:48 AM   #7
RobTheOgre

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hi again well i broke either the diff or cv joints so im working on getting a parts 89 735i that i will part out (so make offers on parts) but before i broke it i found that putting a jumper wire across the wires in the bottom connector for the S-E-123 switch made it shift correctly. so now im thinking (due to staring at a wiring diagram for hours & trying a diff S-E-123 switch, and trans computer) that it must be the P-R-N-D-3-2-1 switch any ideas and/or parts requests
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