I have a list of issues with this Millenia that maybe someone can help on. First of all it shows codes P0300 and P0301, which are misfire/ignition codes. Clear the code and back it comes. Idles rough sometimes then smooths out. Upon driving, it will not accelerate past 3000 RPM and makes a clacking noise from the lower engine area.

Someone has been into the engine because its missing some covers and what not. I haven't been into it yet so a good strting point will be helpful. Plugs and coils are where i think I should start. Any suggestions?

Thanks,

Nick Wells,
Wells Motorsorts

 

0300 is random misfire, and 0301 is specifically coil #1. rear bank(nearest the firewall) is 1-3-5, and they get the most heat. at least 1 coil is bad. first off, when was the last time the plugs were changed? if the answer is i dont know, plugs are a 60k item. next, if the plugs WERE changed, did you put the CORRECT ones back in? i hope you dont say you used those "trick" iridiums. if you do decide to change the plugs, and the coil, i suggest you move the rear coils to the front, since they are the ones more likely to be bad. plus, the front coils are really easy to get to. the rear ones will make a man of you, or make you cuss like one. if you keep driving the car with flashing cel, you are risking destroying the engine.

 

Ok, I changed the plugs back to O.E. Now I have a misfire on cylinder 6. I assume it is the coil. What could cause the loud knocking and clanging from the lower motor? It is far too sporadic and loud to be bearings.

It has a compression reading between 145 and 150 on all 6 cylinders.

 

Ok now this is getting frustrating. I'm starting to hate this car. I've managed to chase the misfire back to cylinder 1. Why is this thing playing musical misfires? I fix one and it moves on me.

Also now I have a mechanical knocking on top of the motor that comes just off of idle them lessens in in intensity.
I will try to attatch a picture of where the knocking is originating.

 

Well it has a BAD cat on bank one. It glows cheery red after a short run time. Does anyone know what Mazda will want for this thing?

 

$333.32 for the bamk one Catalytic Converter. I will let everyone know thw outcome once I replace it.

 

333.32 is a killer price for a cat. are you sure it is the correct one? i have found that if it sounds too good to be true, it usually isnt. i see catco's for 440.00, and easterns for 467.

 

That is SUPPOSED to be the BANK 1 converter just below the manifold.

 

This is the right manifold/ converter. Now how do you get the bastard in and out without pulling the motor?

 

Ok It's done. Moderate difference in drivability. Still misfiring. Gives p0300 general misfire and p1110 IAT Sensor Malfunction. I think i know why the IAT code is up but all three coils are new on the back and all the plugs are stock NGK.

Any ideas guys?