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Re: Which grade gasoline to use? 700 1989

posted by  someone claiming to be Don Foster on  Sat Nov 10 13:43 CST 2001 [RELATED]

Hmmm...

The track record of the fuel injection control units appears to be very good, which is in contrast to the track record of the relays -- which is very bad. I've never resoldered a cracked solder connection in an FI ecu, although I have repaired an ignition module....... But this was when a ham-handed fool (me) broke a pin in the socket. (Can't blame that on the solder quality.)

Your description sounds a bit like a failing temp sensor (the one for the ecu, not for the gauge). It could also be a bad connection or plug at the sensor.

Also check the ground leads for the injectors -- the four heavy black wires attach to the intake manifold. Clean the connections, use a bit of grease to prevent oxidation, and tighten down the bolt.

You might have several problems -- crummy gas, a bad knock sensor, a bad injector ground, a bad injector...... the list goes on. Be absolutely positive your plugs, wires, cap, and rotor are in "new" condition. Perform the "midnight test" to confirm that you don't have high voltage leakage.





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