I have a stock 93 MX-6 V6 KLDE with a definite lack of power and rich mixture. It idles OK with a slight fluctuation of the needle. Engine is OBD1 and was thowing codes 17 and 24, indicating o2 inversion errors on both sensors. I have replaced both sensors, CEL has not come up again, but the engine continues to drag upon acceleration. Plugs are reddish brown. No fluctutations in engine temp. Engine starts easily. Poor mileage.
Here is what has been done or checked: Compression 175 to 185PSI across all 6 cylinders Entire ignition system has been replaced during troubleshooting - plugs, wires, distributor. Vacuum is at 20hg/in at idle, thoroughly checked over for vacuum leaks by myself and a shop - found none. Injector resistance spec is between 12 and 16 ohms - all read at 14 Timing belt has been changed recently - valve timing has been triple checked. Fuel pressure spec is 30-36psi at idle. Current pressure is at 34psi idle. Fuel filter is new, pump is nearly new, fuel return line is not clogged. VAF meter tested OK Intake manifold and throttle body cleaned and installed with new gaskets. Coolant temp sensor checked OK Crank position sensor NE-1 checked. OK Throttle position sensor set within factory spec - .65v at idle, 3.75v wide open. air filter is stock, and clean. All VRIS valves working No obvious signs of head gasket failure. - Temp fine, coolant level maintained.
What would my next step be? The engine used to run closer to the lean side when it was in top shape. Intermittent misfire? Bad injector spray pattern? EGR? bad cat converter?
Thanks,
Brad