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No start 1990 740 GL repeat. 700

posted by  mapleleafer on  Fri Oct 27 13:02 CST 2006
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last visit: Wed Oct 9 00:36 CST 2013
[RELATED]

Two of those codes should be expected. The throttle is closed and with the car stationary, no speed (not speedo) signal.

If you have steady spark from the coil, then you already confirm functioning of the crankshaft pickup.

Fuel pressure should be 3 bars/43 PSI. Check this when experiencing the trouble. If it is closer to 30PSI, you may have low voltage to the main pump due to intermittant fuel pump relay or wiring to the pump. "Over 30 PSI" is not a close enough measurement being so far from what is needed for proper spray. If pressure is, in fact, over 40PSI, then you need to check for two things at the injectors...

12 volts on on side (will appear on both sides if any injectors are connected when you check) from the suppressor relay. And pulses toward ground whenever the engine is cranking or running on the other. A simple LED type injector test will help tell if both are there, but will not tell which is missing of it does not flash. This second side is the output of the injection ECU. After you determine if either of these are the culprit, you can trace the proper direction.






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