Volvo 240 Ignition timing

Peter D · Oct 18th, 2005, 16:17

Volvo 240 SE 1993 B200F LH2.4 Jetronic. Yes that one but bear with me here. I am still in trouble with my Volvo but I have made some progress. I thought the Knock sensor was not working and removed same to test off the block only to discover the scope lead was faulty. However this caused me to dig out my timing strobe only to discover the engine at tick over appears to be well retarded but does advance once the throttle switch comes in and the revs pick up it advances a lot.

As I has a spare ignition ecu I tried that but it made no difference to the tick over timing but now assume the high idle is being caused by the well retarded engine.

Any ideas as to what may be causing this. The ignition LT pulses are spot on and stable but just late. No Fuel or Ign ECU error codes and engine now cycling the O2 at Tickover and at 2500 rpm. Any help appreciated. Regards Peter

Peter D · Oct 20th, 2005, 15:08

Any one know what the Knock Sensor waveform should look like on this model. Regards Peter

Oct 18th, 2005, 16:17	#1
Peter D Peter D Last Online: Mar 2nd, 2015 21:03 Join Date: Dec 2002 Location: Livingston	Volvo 240 Ignition timing Volvo 240 SE 1993 B200F LH2.4 Jetronic. Yes that one but bear with me here. I am still in trouble with my Volvo but I have made some progress. I thought the Knock sensor was not working and removed same to test off the block only to discover the scope lead was faulty. However this caused me to dig out my timing strobe only to discover the engine at tick over appears to be well retarded but does advance once the throttle switch comes in and the revs pick up it advances a lot. As I has a spare ignition ecu I tried that but it made no difference to the tick over timing but now assume the high idle is being caused by the well retarded engine. Any ideas as to what may be causing this. The ignition LT pulses are spot on and stable but just late. No Fuel or Ign ECU error codes and engine now cycling the O2 at Tickover and at 2500 rpm. Any help appreciated. Regards Peter

Oct 20th, 2005, 15:08	#2
Peter D Peter D Last Online: Mar 2nd, 2015 21:03 Join Date: Dec 2002 Location: Livingston	RE: Volvo 240 Ignition timing Any one know what the Knock Sensor waveform should look like on this model. Regards Peter

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