95gtdrop
Active Member
I put a factory one on already and it still failed with em
Taken from: http://www.asashop.org/autoinc/oct2004/techtips.htm
1) The cooling system. This system needs to be in proper working order or the engine can run hot, which can elevate NOx emissions. In this vehicle, the cooling system was working properly.
2) Incorrect timing or spark advance. I had the technician verify that timing and spark advance were correct. The distributor was in the center of its adjustment so I knew camshaft timing was also correct.
3) Carbon deposits in the combustion chamber. A compression test showed it was within specifications.
4) Incorrect spark plug heat range. Always verify that the plugs are the right application and heat range.
5) Incorrect vacuum to the EGR valve. First we checked codes in the engine control module (ECM). In most Hondas, if it has an EGR problem it will set a code. There were no codes in the ECM so we assumed everything was functioning normally. I had him tee a vacuum gauge into the vacuum line to the EGR valve and test-drive the vehicle, which indicated there was no vacuum signal to operate the EGR valve.
95gtdrop said: