My buick has a olds 307 in it, I just put full flowmaster exhaust, and k&n filter, and it runs rich, which plugs and wires would be best?
I don't think the new exhaust has anything to do with it running rich. And I don't think new plugs and wires would solve the problem, except for the clean plugs, but I like NKG plugs. EDIT: Did the old exhaust have a sensor that was swapped into the new system?
Figure out why the car is running rich first. As far as plugs and wires, I stick with AC for the wires, and regular old copper core plugs. AC, NGK's are my preference. On what no to use, the 307's don't like the small gap of Bosch platinums in my experience. They never seem to idle quite as well as the regular old AC plugs, or equivalent. Mike
Everything I own has AC Delco Resistor plugs in it. I've always had great luck with them. And I've tried tons of different wires from very expensive to the cheapest of the cheap and have never noticed much of a difference between them. But I'm a frequent tune-up guy, so if you're not, the expensive wires probably have a longer life.
Freeing up the exhaust flow and a better flow filter should make it a little leaner if anything.........
What he said. The 307 does have an O2 sensor. It's located in the passenger side exhaust manifold, just above the flange to the exhaust pipe. One of the things I've found on the 307 with CCC is that a bad Air Selector Valve can cause the A.I.R. pump to blast fresh air directly at the O2 sensor even after the system goes into closed loop mode. This causes the computer to think the engine is running lean and thus it commands the carb full rich. Under normal conditions the A.I.R. should only send air to the exhaust ports when the engine is cold and in open loop mode (before the O2 sensor is up to temperature). After that the Air Selector Valve is supposed to reroute the air to the converter pipe.
