If the fault persists and you reset the code using the OBD-1 code check and the CHECK ENGINE light returns, well, you have a fault with the EGR.

Are you in CA or CO-state?

Didja check socket 6 (ignition) for fault codes? The ignition ECU is what controls EGR. The fuel LH-Jet ECU merely takes signal and will set fault code. So, a fault in 2 may mean a fault in 6, also.

Be nice to know which ECUs you have by Bosch and Volvo number.

If the EGR temperature sensor is working, the faulty may mean
- EGR vacuum control if not working
Failed vacuum, failed EGR valve, malfunctioning EGR vacuum controller. That little think with the white cap.

- Temp sensor has failed (the wire frays and breaks inside the insulation at the sensor where the metal ends and the wires pass out).


- EGR piping is clogged with exhaust vapor condensates. These clogs usually form at the intake end as it is more or less cooler than what comes out of the exhaust.

Another option is to cap the exhaust manifold and install a known good Jetronic 2.4 ECU and a corresponding ignition ECU. Most of the control of EGR is in the EGR-enabled ECU.

Yet we do not have a comprehensive table of these ignition controllers in the FAQ.


Prior posts with my replies on EGR. I have a 1991 240 with EGR.

RWD - Some EGR Options for You - Brickboard

https://www.brickboard.com/RWD/volvo/1650093/220/240/260/280/egr_temperature_sensor.html

RWD - EGR temperature sensor - Brickboard

https://www.brickboard.com/RWD/volvo/1650110/740/760/780/egr_valve_delete_substitute_piping_parts.html


hacking the EGR system 200 1992

https://www.brickboard.com/RWD/volvo/1627292/220/240/260/280/hacking_egr_system.html

EGR Temp Sensor code 4-1-3 900 1994

You don't have this fault code, and yet ....

https://www.brickboard.com/RWD/volvo/1572807/940/960/980/V90/S90/egr_temp_sensor_code_413.html

Questions?

Hope that helps!!!

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