Will start, won’t start, will start�

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   When it's totally cold, my '83 635 auto won't crank on the key, but it will 

crank and fire if I jump the pins on the diagnostic plug to operate the 

starter. Switch off and then it will start on the key, but never first time. Is 

this the ignition switch? Or am I in for all sorts of wiring-related 

difficulties to track this down?

Cheers

Dan

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Dan Stevens Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 11-May-2004 Location: United Kingdom Status: Offline Points: 36	Topic: Will start, won’t start, will start� Posted: 01-July-2005 at 06:51
	When it's totally cold, my '83 635 auto won't crank on the key, but it will crank and fire if I jump the pins on the diagnostic plug to operate the starter. Switch off and then it will start on the key, but never first time. Is this the ignition switch? Or am I in for all sorts of wiring-related difficulties to track this down? Cheers Dan

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siscobmw Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member II Joined: 13-May-2005 Location: North Italy , near lake of Como Status: Offline Points: 201	Posted: 01-July-2005 at 10:41
	Sorry which pins operate the starter? There are two way to operate starter from diagnostic connector( one will destroy the ignition coil over time , the other is what Haynes manual says)... Look , first of all : main relay( there's should be a little green wire, check if it's hot when "the instrument cluster is illuminated"-position 2 of ignition key-.If it's not hot -no electricity at all-, Your On board computer has a faulty relay inside the brain....It's the relay that receive the input from his burglar alarm code on the OBC.This relay could be cleaned, but it's a great fuss to reach with fingers or tools), or bad fuel pump. Other problems are sensors on clutch bellhousing....If they are dirty , they send info randomly. Other last-but-not-least culprits: bad temperature sensor, bad ignition coil, bad ignition key contacts..... Hope this helps , Francesco from italy