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Previously i had problems with P0300,and P0307-P0312 misfiring errors. I replaced the voltage transformer a couple days ago... Now the car drives smooth, however it pops up the error code of P0300 without any other codes for every drive. The status of the code is pending sometimes, and stored the other times.
There are no symptoms of the car at all, apart from the engine light.
It usually pops up after 10 mins of driving, rpm @ 2000-2500, speed @ 50-60 mph.
I have poured one bottle of STP fuel system cleaner, it doesn't help to solve the issue. By the way, i am fueling with octan 95 petrol, shall I use 98 instead?
Can someone interpret the data please? Thanks
Last edited by kiniser; Apr 30, 2018 at 01:13 AM.
Reason: formatting
Previously i had problems with P0300,and P0307-P0312 misfiring errors. I replaced the voltage transformer a couple days ago... Now the car drives smooth, however it pops up the error code of P0300 without any other codes for every drive. The status of the code is pending sometimes, and stored the other times.
There are no symptoms of the car at all, apart from the engine light.
It usually pops up after 10 mins of driving, rpm @ 2000-2500, speed @ 50-60 mph.
I have poured one bottle of STP fuel system cleaner, it doesn't help to solve the issue. By the way, i am fueling with octan 95 petrol, shall I use 98 instead?
Can someone interpret the data please? Thanks
Kiniser, I had a same problem. Only P0300 faulty code. What did you fixed your car? Thank you.
Those error codes without a miss you can feel indicate incomplete combustion 'misfires.' detected by the 2nd plugs on the Drivers side. (The system switches the plug 'duty' every ignition cycle.) A single tank of bad fuel (high gum content) can plug the fuel injectors and cause misfire codes. Since the codes are showing up only on Driver side and intermittently, after engine is hot, the fuel injectors seem to be working.OK. Usually if they are malfunctioning, a partial plugged tip or bad spray pattern are more noticeable at idle.
The root cause may be the voltage regulator or coil pack on the Drivers side.
The ignition system first 'fires' a plug with 40KV to ignite the fuel and start combustion and shortly after that 'fires' the 2nd plug with 1000 V and from the current draw measures the conductivity of the gas after the combustion wave has passed. A 'partial misfire' is happening if these codes are 'pending,'and there have not been enough yet to trigger the MISFIRE CEL.
A very good explanation!
Everybody is into changing coilpacks for no good reason.
My experience has been to look at lamda sensors and catalytic converters.
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