some msd/o2 sensor experience needed
I have the AEM. With the car tuned so it runs well the O2 sensor reads rich from idle to WOT (12 to 11). I have a MSD ignition and Edelbrock 1411 carb. Anybody else have readings that rich?
Yep, have you removed the sensor and recalibrated it since it was run?
Also be aware that just because 14.7 to 1 is the supposedly the perfect A/F ratio doesn't mean the engine is going to like it that lean.
For example, if I adust to run at around 14.7 average at idle it runs rough and misses a little. (almost like a rough cam idle)
I also drive to lower elevations frequently, so I leave it where it runs nice here and doesn't go lean at lower elevations.
For every 2000 feet lower it seems to go about a full point leaner.
At 5500 feet where I live it runs average 13 to 1 and at 2000 feet about 14 to 1.
Any leaner and it acts lean.
The way it is now the plugs look good.
I have a question? I use 100LL av-gas. BEFORE I ordered it I checked and it said that it was compatible with unleaded, leaded, diesel ect. THEN I purchased and was reading the instructions on line and it goes on to say leaded fuel will significally reduce sensor life ? :banghead: Anyone experience that?
I saw that when I bought mine, and apparently the lead clogs the sensor up so it needs to be replaced more often.
Maybe tune with yours and then remove it for normal running?