Lauren's 1985 Kouki Trueno

[Lauren]

After re-setting the ECU we found it cleared the flatspot. It then returned a couple of weeks later.

Did an error code check:
Hmm, flat spot seems to have come back again.

Error codes:

5 Oxy sensor open circuit
6 RPM signal/no-signal to ecu from distributor ("ne" or "g") after engine has been cranked: distributor/circuit; starter/signal circuit; igniter/igniter circuit; ECU
10 Starter signal (no "sta" signal to ecu until engine speed exceeds 800rpm): vehicle is push started; ignition switch/circuit; ECU. Not a real problem unless it recurs.
11 Switch signals: TPS idle switch off; neutral start switch off (automatic transmission in Drive); A/C switch on; A/C switch/circuit; A/C amplifier; TPS/circuit; neutral start switch/circuit; ECU

Have reset the ECU again to clear the codes. Last time we did this the engine seemed absolutely spot on.

Checked the oxy sensor and it is was giving a very weak signal, so think it's on it's way out. Fortunately we had a spare one lying around so once I get a gasket for it, we'll put that in. I'm hoping at the very least it'll improve the MPG from an average of 23!