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Thread: 1983 733I BMW no start
05-15-2008 12:46 PM #1
1983 733I BMW no start
OK well first we replaced the starter and solenoid and now it turns over but is not getting any spark at the engine or the distributor. The car was running fine until the starter went out. my friend replaced it and told me to replace the coil. Still no spark so we checked the distributor and it looks new just like the spark plug wires. I also don't think i hear the fuel pump engaging. any help would B appreciated
05-15-2008 03:23 PM #2
05-16-2008 11:54 AM #3
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04-16-2012 07:44 PM #13
- Poughkeepsie, NY, United StatesMember No: 33911
- Join Date
- Apr 2002
- Rep Power
05-12-2012 07:22 PM #14
No Start No Joy
I just brought home someone's nightmare '83 733i no start. I watched it fall on Craigslist from $2400 to $800.
I have gathered from various people to check the coolant temperature switch - in the thermostat housing. Two dinky wires and the switch itself can fail and will aparently kill the spark. Is it a thermal trip/kill for the engine? Anyone?
Also, I'm not sure how to "CODE" the OBC (onboard computer) and the anti-theft might be an issue.
Bad engine ground was tossed out there too.
What basic tools are needed to sleuth this stuff?
05-13-2012 10:51 PM #15
The 83 wiring diagrams are located on e38.org/e23. Go to page 116 and you will see the OBC1. There is a lock out code feature on plug C1 pin 14 and 16 which cuts the power from the ignition to the main relay. It can be jumpered. Assuming that the fuel pump and main relays are good you might fine the OBC to be the problem. Carefully check the relays first and check for spark second. Next it may be the OBC. The temp/time switch controls the cold start injector so I wouldn't think it would be a problem. Study those ETM diagrams and do some circuit tracing. Good luck. I don't know where the OBC box is on an e23. It is above the left knee on an e28. Check the location pictures at the end on the ETM.
05-17-2012 05:44 AM #16
1983 E23 No Start
ROYinGA, thanks for the reply, I've got some updates...
1 - the relay on the firewall, in front of the passenger has some sort of high energy constant drain. It arcs when I pull it out, and energises when I put it in (whith the key out of the ignition). It gets super hot, until the battery is dead...
2- I relocated the ground to the intake manifold
3- cleaned metal shavings off the transmision bell housing sensors
4- programmed the OBC, I think, but will follow your instructions next...
5- cleaned the sensor contacts at the thermostat area
Ohm meter test of all sensors...
05-21-2012 12:10 AM #17
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11-18-2012 06:36 PM #20
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