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86 740 turbo - starts when starter is jumped, not with key though 700 1986

posted by  Lammmy on  Tue Feb 26 18:02 CST 2008
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last visit: Wed Feb 27 03:18 CST 2008
[RELATED]

Hi All,

I've been having a real fun time with my 740. Basically after a month of troubleshooting and slowly replacing parts, it came down to an ignition switch failure, which has now been corrected.

The weird thing is, the starter would turn over the whole time, but no power to anything else.

Now, the key in the ON position, bridging the starter with a screwdriver, the car will start and run fine. However, using the key to turn to the "start" position, cuts power to the whole ignition/fuel system, but still cranks the starter...there is just no spark or fuel.

What would this indicate? the things I've replaced so far:
coil
hall sensor
powerstage
fuel pump relay
wiring harness
ignition switch.

So, can anyone help me, or do I have to resort to installing a "Start button"? :)

Thanks in advance.






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