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no start (most of the time) 700 1989

posted by  Will740turbo on  Mon Sep 28 16:25 CST 2009
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last visit: Wed Oct 22 16:09 CST 2014
[RELATED]

Sounds exactly like a no-fuel pump on issue. Did you check all the fuses? If he drove it into a deep enough street and shorted out the fuel pump, then maybe he blew the fuses, but... Then it shouldn't build enough fuel pressure to start the car.

The ECU (when it's working right) turns on the fuel pump relay and pump for only a few seconds to prime/establish pressure, then needs the rpm sensor to tell it that it needs to keep running the pump.

Someone with better knowledge can help you out with this, but I think your buddy may have fried something with the ECU or rpm sensor.
It's obviously not a total failure, if you're getting the car to run for a bit.

Does it turn on the pumps when you first insert the key and turn it to KP2?

-Will
--
1990 740 Turbo, on its way to stock specs, maybe beyond






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