I have a stock 91 1.5l that seems to be running rich. I have noticed by the smell of fumes and also build up at the end of my exhaust. The engine is mostly stock with 35,000 on the stock engine. I have a new O2 Sensor, new spark plugs and wires, a new intake and a test pipe. Does anyone know what the problem could be. I was thinking fuel pressure regulator. Thanx

 

BBump

 

Not having a cat could be causing the smell. Check the spark plugs to be sure it IS running too rich. I live at 4500ft elevation and my car runs rich all the time, the ecu can't adjust enough to compensate for the elevation, don't know what you're at...

 

I dont think altitude could cause it in my case..but ill pull out the plugs and get back to you thanks