I have a problem with my egr-valve. When the car is not used for like 12 hours and i start the engine the Service engine light comes on, it says egr-trouble. Then if i let the engine run for like 3 minutes and then start it again it works fine (no trouble code). Why is that. I have changed the egr-solenoid and the lambda but it doesnt do any good. Anyone knows what is wrong??

 

Try disconnecting the battery for a few seconds then reconnect the battery. Drive your car and see if service engine light stays on when driving the car. A SES code will stay in the ecm unless you disconnect the battery to erase the code.

[This message has been edited by 86z/92rs (edited October 05, 2001).]

 

Scania,

Typically, the EGR will not set an operational error code until the engine is warmed and running at highway speeds with a light throttle (cruise conditions). The exceptions to that are when the ECM detects either a short-circuit or open circuit at the EGR solenoid. Since your solenoid is new, I would suggest inspecting the wiring from the ECM to the EGR solenoid. Any pinched or cut wires in this circuit could be a problem which would set an immediate error core.

It is also possible that the EGR diagnostic temperature sensor is failing or out of tolerance, or has similar wiring problems.

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double post

[This message has been edited by 86z/92rs (edited October 05, 2001).]

 

triple post

[This message has been edited by 86z/92rs (edited October 05, 2001).]

 

Thank you very much for the suggestions i should try them . Maybe i have to change the egr-valve.