Misfires under load (acceleration) can be caused by the valve cover gaskets leaking oil into the spark plug wells shorting the spark plugs to the cylinder head. New spark plug wires will be needed and the valve cover needs to be resealed.
Resources for the Repair and Maintenance of your 2000 Mazda Millenia
2000 Mazda Millenia
2000 Mazda Millenia Problems
The passages for the Exhaust Gas Recirculation (EGR) system can become restricted or clogged causing the Check Engine Light to illuminate. The EGR valve will need to be inspected and the passages cleaned.
The oil seals on the supercharger can fail and cause excessive oil consumption and bluish gray smoke from the tail pipe. Supercharger replacement is commonly required to correct this concern, this can also be an expensive repair.
There are T-shaped vacuum connectors under the intake manifold that can break and cause a rough idle.
Timing belt replacements can be very expensive on the supercharged models. It is important to be sure the timing belt is replaced at the scheduled interval.
2000 Mazda Millenia Questions and Answers
check engine light keeps blinking code says misfirein cylinder 1 changed s.plugs & wires whatelse do i need to do?
what is the firing order of the mazda millenia 2000?
I have a tappin sound at the top of engine where the timing belt is at what is that noise
what is the BTN 60 amp fuse for? Its pulling my battery down when the car is off.
2000 Mazda Millenia Reviews
I know you are out there, Milenium owners with 2.3l supercharged equipped engines, downstream O2 codes, new O2's, still setting codes, new converters, still setting codes. I fought this battle for a year and a half trying to get the car inspected. There are two causes for this condition I believe.
First obvious is bad converter(s). I had mine "flowed" or tested at the dealer ($85) after I installed a new aftermarket O2 sensor. They said the converters were OK, or about 75%. I didn't feel the justification of the expensive converter pipe(s). I bought and installed a second rear downstream O2, this time from the dealer.
Apparently, the factory rear downstream O2 sensor is "overly sensitive", or defective from the get-go. New superseded Mazda unit replaces defective original Mazda O2 part #.
Replacing the NEW Aftermarket sensor($84, based on the 1st overly-sensitive Mazda design) with Mazda's new and improved sensor($168)worked for 2 weeks, long enough to get a valid NYS inspection sticker. Hello ck engine light Again. . .
The second cause is due to mileage. The supercharger's oil seals/engine's piston rings on a higher mileage engine allow a bit too much oil/power stroke blow-by to squeak by into the exhaust stream's sensitive O2 sensors, "fouling" them out, tripping a Ck Eng light code. This can also thin your oil out prematurely between oil change intervals.
Go to NAPA. Ask for Sea Foam. Follow the directions,(add to fuel tank/or inject into intake stream while running) Drive the car. Feel the difference, ck eng light turns off for about 2-3 weeks. Buy another can of Sea Foam ($8). repeat as necessary. Car has been fine without replacing the converters, needing a can of Sea Foam treatment about every 3rd tank of gas for the last 5 months now.
Sea Foam cleans the dirty O2 sensors(witch are brand new, but oil fouled) so that they can properly read and feedback the exhaust content to the car's computer (ECM) to make air/fuel ratio changes required on the fly for todays' strict emission monitoring and requirements.
I found the $8 can of Sea Foam to be an attractive solution compared to a complete engine tear down and new over-sized piston ring fitment, or worse yet, new over-sized pistons & rings, machine work to make them fit, engine gasket kit, reassembley . . .$$$ , and little or no factory support of information for the Dealerships (or willingness to repair the problem). Alternatively, the dealership can "re-flash" the ECM, eliminating the downstream O2 trigger code (not really fixing the problem just eliminating the trigger to turn on the ck engine light for this specific code). this cost more than I was willing to spend. :)
- Just thought I would add that the light has been off now for close to a month. Outside of this 1 problem (not really the cars' fault), I have been very impressed with the build quality,fit & finish, and overall feeling of luxury while owning this car.
Tough to service though, shops will charge more $ to work on due to unfamilarity and many parts are only available from Mazda.