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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 07-03-2005, 06:48 PM   #1 (permalink)
n00b
 
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olmsteade is an unknown quantity at this point
I own an '89 325i. It will run when it wants to. When it does run it may decide to just randomly shut off at any time, in gear, driving down the highway, it doesn't matter. There is always power at the coil. It just doesn't get to the spark plugs. The master relay has been replaced and meters out with in specs. The reference/pulse sensor tests out ok. I have replaced the Motronic EMC and that didn't do anything. One thing I have noticed is that when the car is going to start you can tell because when you turn the key the Check Engine light will come on with everything else. When it's not going to start, no check engine light. The plug wires or distributor have not been touched, but when the car starts it runs and idles fine. Any ideas would be much appriciated. I have been trying to nail this ghost for awhile now, and being stranded is getting old.
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Old 07-03-2005, 11:26 PM   #2 (permalink)
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Boston e30 is an unknown quantity at this point
Pull the distributor and examine the contacts on the cap and rotor. Make sure they arn't caked with burned residue.
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Old 07-05-2005, 02:24 PM   #3 (permalink)
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bad man working is an unknown quantity at this point
When you say the motronic EMC I take it you mean the motronic control unit (DME ECU) if so:
I think youíre loosing a main feed or earth to the to the DME ECU or the crank sensor signal.
Iím a Brit so I donít know how the engine management light works on an E30 but it sounds like the DME ECU isnít turn on. Volt drop test the main feeds and earth at the DME ECU. I can give you pin numbers etc but BMW use DIN standard wiring so the Feeds will be heavy wires main red ands the earths will mainly brown. To test the crank sensor you should get a 2-5voltage AC approx from the sensor at cranking speed, with out that AC voltage the DME ECU wonít turn on
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Old 07-17-2005, 10:11 AM   #4 (permalink)
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olmsteade is an unknown quantity at this point
Than you very much. I wasn't aware of this but the DME relay has it's own feed coming right off the battery and it was only getting about 2 volts do to a frayed wire and the connector to the terminal. Problem solved.
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