Exhaust smells pretty bad...

Ever notice how some diesels just have sweet smelling exhaust? Well mine will make you cry. There is no smoke at idle, but I can smell it from a 50 ft radius. When it idles around anyone else they complain. It happened about the time I put injectors in it, but I wouldn't expect this at idle....

What a possible contributing factors to foul smelling exhaust? There is no cat to be plugged, and even if there was it wouldn't be reacting at idle so it wouldn't help...

Thanks.