1990 nissan 240sx ka24e Code 12 and code 41

[uno240]

Does anyone have any idea what a code 41 is? My car has been idling really bad and it threw code 12 so I cleaned out the MAF and reset the ECU. Now it is throwing code 41. Four blinks of the red one blink of the green. I have never seen this code before or read it anywere. Could my ECU be dead? Any help would be greatly appreciated. Thanks

[jdm_master_X]

IIRC, i think Code 41 is EGR fault. it makes sense because your EGR can cause rough idle because the EGR is not opening at the right time.

[uno240]

Is there any way to test the EGR valve. Or can I remove it and clean it? Also when I start the car I have to hold the gas in for about a minute or the car will just die out. After it warms up just a little it will idle without me holding in the gas but very rough.

[jdm_master_X]

well the car will run rich until the engine warms up.

i think you can test it with a vacuum pump and tee fitting. just attach a vacuum tee between the lines of the EGR and to the vacuum pump. with the car on, apply vacuum, and see if the condition of the engine changes.