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31-05-2001, 11:53pm
There are two things that happen when the ECT sensor reads low temperatures, as during warm up.
1. The ignition is advanced up to 9 degrees (to speed up the warm up) and
2. the mixture is richened.
From your symptoms I would suggest that the fuel bypass strainer is getting blocked (richening mixture further when cold) and the engine is running too rich.
An easy way to check is to disconnect the ECT at the thermostat housing and test. When the ECT is disconnected the ECU reverts to an 80 degree voltage and there is no change to mixture or ignition timing. <i></i>
1. The ignition is advanced up to 9 degrees (to speed up the warm up) and
2. the mixture is richened.
From your symptoms I would suggest that the fuel bypass strainer is getting blocked (richening mixture further when cold) and the engine is running too rich.
An easy way to check is to disconnect the ECT at the thermostat housing and test. When the ECT is disconnected the ECU reverts to an 80 degree voltage and there is no change to mixture or ignition timing. <i></i>