RX300tina

I just replaced the back three ignition coils a month ago and now it's giving me the same error code PO300 or just 300 this what my mechanic is telling me. It's a mis-fire I guess.

Anyone have any experience on this one? I just want to do my home work here before I drop another $500.00 in it again.

Thanks

salimshah

There are 6 coils so if one fails, the other(s) may be close to their end of life.

Now if the code is pointing to the same misfire, then a good tech would first confirm that the replacement was of good quality and then try to look for another reason why the code is coming up ... like cam_position sensor, wires etc.

Some of the obd2 reader can display more than the basic code.

Salim

lexus114

Plus,it should pin point witch cylinder is misfiring.Unless it is multiple misfiring. (like I had after cleaning my throttle body)

Lexmex

Ah, a random misfire, that's P0300. I'll give you the list first of possibilities and then let you know my thoughts.

Possibilities include:

Ignition system
Injectors
Fuel line pressure
Compression
Valve clearance
Valve timing
MAF
Engine coolant temperature sensor
Short in the wires connecting the ignition coil
Connection (between plug and/or connector on top of coil)
--------------------------------------

A possibility here is that the spark plugs are fouled up on the rear due to raw fuel being dumped in and though the coils are fine, the misfire occurs due to the dirty plugs.

In addition, make sure the coils are properly seated on the plugs themselves.

Another possibility is any air leak to the combustion chamber could be on the air intake or any hose left off.

If you had say a P0301, P0302, P0303, P0304, P0305 or a P0306 then you'd have a specific coil involved.

victor61

have a 1992 ls 400 and left coil is not working i just replaced both igniters and both coils any ideas ? will apreciate any coments thanks!