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Re: Failed Oxygen Sensor or ECU? 200 80

posted by  someone claiming to be Roger on  Sun Nov 12 06:17 CST 2000 [RELATED]

Hi Dave,

If I'm remembering correctly, your '80 242 has the K-Jet with Lambda for fuel injection. It modulates the mixture by modulating the frequency valve. The first basic sanity test - the frequency valve should be buzzing. If so, the ECU is getting some sort of input (maybe not correct) and generating an output. If so, I would check other things before getting a new ECU.

Other things that could cause it to run rich:

Temperature sensor. The ECU has a temperature sensor (separate from the gauge temperature sensor) that disallows ECU operation if below a certain temp. If the temp sensor is failed, ECU may never start working.

Control Pressure Regulator: If your control pressure is wrong, it could cause the car to run rich.

Fuel System Pressure: If the return path is blocked, the system pressure will be too high which can cause problems.

(I apologize if I'm a little vauge here - it's been a few years since I worked on a K-Jet car...)

Roger





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