Went and ran the lude over to 3gdude's shop today and we took a good long look at issues it has been having. First off was the code 12 (EGR Lift sensor) that has plagued me since I bought it. After removing the EGR valve from the car, we took the sensor out and found out that the sensor was was actually stuck. The valve itself was fine. Bill applied a little PB blaster and was able to free it. The triangular shaped gasket for the sensor was also a little old and not holding vacuum after we put it back on, so I forced a little round gasket into the triangular shaped gasket cavity and it fit like a charm. After reassembly, the EGR valve held vacuum. No more code 12 came up after I put the valve back on the car.
On to the next issue, the lude is running rich! We hooked up a back probe to the O2 sensor and ran it on to a meter. The meter showed .9 volts at idle. (anything over .5 is rich) After checking a multiude of other things (fuel pressure, system vacuum, fuel pressure regulator, etc etc) we hooked a vacuum pump/gauge to the map sensor tube (#21 out of the control box). When we increased the vacuum, the engine started to lean out. We only had to decrease the vacuum about 1/2 inch before it started to get rich again. So, the conclusion is possibly a bad/old map sensor, or something clogging the vacuum line just enough to cause the mixture to richen up. Gotta find someone with a known good map sensor so I can switch it out to test our theory.
BIG thanks goes out to Bill (3gdude) for helping me out on this one. The beer is on me next time dude!!
On to the next issue, the lude is running rich! We hooked up a back probe to the O2 sensor and ran it on to a meter. The meter showed .9 volts at idle. (anything over .5 is rich) After checking a multiude of other things (fuel pressure, system vacuum, fuel pressure regulator, etc etc) we hooked a vacuum pump/gauge to the map sensor tube (#21 out of the control box). When we increased the vacuum, the engine started to lean out. We only had to decrease the vacuum about 1/2 inch before it started to get rich again. So, the conclusion is possibly a bad/old map sensor, or something clogging the vacuum line just enough to cause the mixture to richen up. Gotta find someone with a known good map sensor so I can switch it out to test our theory.
BIG thanks goes out to Bill (3gdude) for helping me out on this one. The beer is on me next time dude!!
