emissions issues/ check engine light issues

[Rays_240]

ok so heres the deal,I have a 93 240, It failed emissions, It has no check engine light. I was messing with the egr valve and I found a big hole in a vacum line going form the egr valve the the egrc-bpt valve. I replaced the line but I have a feeling that the bpt valve is messed up along with the egr. basically my question is if my egr was not working rite then shouldnt the check engine light come on? I have had other car problems such as a bad O2 sensor and It has never come on. I know its not burnt out because it comes on when my cars ignition is flipped on. Is there a reason that my check engine light wouldnt work?

[desertdustr]

For what it's worth, I can relate. I, too, thought that if the CE (check engine) light wasn't on I'd have no problems with emissions. WRONG !! You'll find several tests in the factory manual that states "non self diagnostic item". (ie. no code, no ce light) My best advice, and i'm no pro, is to test items that control the areas you failed. (co, nitrogen levels, etc.) but don't ignore the basics. (ie. timing,plugs,air filter, etc.)In my situation I had a triggered ce light that was traced to the egr. Corrected it, took the emission tests and failed the co and hydrocarbons. (miserably !!) However, passed the nitrogen levels (egr area) with less than half the allowed level. Anyway,checked the aac,aiv,a reg,etc., put a stronger vacumn line on the fuel pressure regulator, (it was a few lbs to high) put new plugs in, (even though the old plugs didn't look that old, although they were of the four electrode spark gap type.I've heard some negative remarks about certain plugs, don't know if they include these or not.) retarded the timing, etc. and passed both co and hydrocarbons, once again with about half the allowed levels. I don't know if this will cure your problems but, at least, you know you're not alone. Good luck.

[Rays_240]

Thanks for the reply. I keep failing the Nitrogen, and In comparison with a test where my car passed im now running very low in the Carbon Monoxide section. Thats passing obviously but still weird that its now so low. Im asuming my problem is in the egr than.

I fixed the broken vacum line and I started my car and then presed on the back side of the egr. The car began to sputter. I assume that means the egr is working properly? If thats the case than can I assume that the egrc-bpt is also working properly or is there another test for that?