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E28 (1982 - 1988)

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  #1  
Old 03-30-2011, 01:38 PM
brianrig brianrig is offline
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Location: Seattle,WA.
 
Join Date: Mar 2011
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Mein Auto: 1983 533i
1983 533i no spark

I have no spark,no injector pulse,no coil pulse.I have checked reference sensor,and engine speed sensor=ok.main relay puzzles me,the blue/red wires to ecu have 12 volts until i crank then my test light goes dim.also the fuel pump fuse does not light even while cranking.im thinking of replacing the ecu next,just wanted to see if anyone else has come across this.thanks
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Old 03-30-2011, 01:50 PM
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catso catso is offline
catso
Location: Chicago
 
Join Date: Dec 2009
Posts: 2,956
Mein Auto: 2000 323i, 1988 528e
Quote:
Originally Posted by brianrig View Post
I have no spark,no injector pulse,no coil pulse.I have checked reference sensor,and engine speed sensor=ok.main relay puzzles me,the blue/red wires to ecu have 12 volts until i crank then my test light goes dim.also the fuel pump fuse does not light even while cranking.im thinking of replacing the ecu next,just wanted to see if anyone else has come across this.thanks
Check all the cables coming off your battery terminals and especially to and off the starter. Try jumping the fuel pump and or ECM. I wouldn't replace it yet. The connections to the fuse box and the fuses are known problems. Get yourself a Bentley's manual. It has comprehensive test procedures for the main relay, injectors, etc.
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