kartracer35
Member
I just installed my bully dog module... It says to hook up a wire to the fifth or sixth wire on the mass air flow sensor harness. Mine is a 2001 TDI, it only has 4 wires in the harness. I hooked it up to a yellow and black wire on the left, car idled very rough and smoked like a chimney. Turned off car hooked up to small black wire on the right. Car ran fine has tons of power. Glow plug light began flashing and check engine light turned on. Removed Bully Dog and no change, still flashing and engine light still on. Seems to run fine! This bully dog idea may have been a really poor investment if it messes up your car. Any ideas as to what could be wrong?