My car is misfiring and scan result brought out error code P0303, bad plug detected and changed and coil checked and it is ok, but error code still persist.

Gurus in the house, please how do I solve this problem? Will appreciate all advice. Thank you

Look for a good workshop with compression tester,let them check the compression on each cylinder and compare the psi.

GreenWorld:
My car is misfiring and scan result brought out error code P0303, bad plug detected and changed and coil checked and it is ok, but error code still persist.

Gurus in the house, please how do I solve this problem? Will appreciate all advice. Thank you

Which car is this?
A friend had a similar problem. Changed coil and the code returned.
Solution was to flush the injectors, wash the fuel pump filter. And code went away. Coil wasn't changed again. The cause was fuel starvation to cylinder number 3.
Might be your problem since you have changed coil already.

GreenWorld:
My car is misfiring and scan result brought out error code P0303, bad plug detected and changed and coil checked and it is ok, but error code still persist.

Gurus in the house, please how do I solve this problem? Will appreciate all advice. Thank you

Change fuel filter

nakoks:

Change fuel filter

Thank you

9icetoo:

Which car is this?
A friend had a similar problem. Changed coil and the code returned.
Solution was to flush the injectors, wash the fuel pump filter. And code went away. Coil wasn't changed again. The cause was fuel starvation to cylinder number 3.
Might be your problem since you have changed coil already.

Thank you. Done but error code still persist

GreenWorld:


Thank you. Done but error code still persist

Hmmmm. So you've replaced coil and serviced the fuel supply and yet it persists.
Swap coil and injector on that cylinder with those on another cylinder. Swap plugs too. Clear the codes. If it comes back to that same cylinder, then you have an internal problem. If the code moves to the new cylinder you transferred the coil, plug and injector to, then one of those items is the culprit. That's all I can think of for now.
other people might have better solutions.
However this solution, or rather diagnostic check is not invasive and can be performed by you or your mechanic at little or not cost which is why I recommend it. Keep us posted.

9icetoo:

Hmmmm. So you've replaced coil and serviced the fuel supply and yet it persists.
Swap coil and injector on that cylinder with those on another cylinder. Swap plugs too. Clear the codes. If it comes back to that same cylinder, then you have an internal problem. If the code moves to the new cylinder you transferred the coil, plug and injector to, then one of those items is the culprit. That's all I can think of for now.
other people might have better solutions.
However this solution, or rather diagnostic check is not invasive and can be performed by you or your mechanic at little or not cost which is why I recommend it. Keep us posted.

Hello Boss. Please what can make fuel gauge to be giving wrong reading. Sometimes when I have more than half tank fuel, and drive for some minutes the gauge will show that I am having 1/4 tank. If I park for some time and start driving again it will go back to the normal gauge of 1/2 tank. Please what can be the cause so that I can tell my Mechanic what to do. Car is 06 Camry.

seanfer:


Hello Boss. Please what can make fuel gauge to be giving wrong reading. Sometimes when I have more than half tank fuel, and drive for some minutes the gauge will show that I am having 1/4 tank. If I park for some time and start driving again it will go back to the normal gauge of 1/2 tank. Please what can be the cause so that I can tell my Mechanic what to do. Car is 06 Camry.

You have a faulty fuel guage sender.

ksmart027:

You have a faulty fuel guage sender.

Does that mean the fuel pump will be changed?

seanfer:


Does that mean the fuel pump will be changed?

No, the fuel sender is inside the tank and it is different from fuel pump.

GreenWorld:
My car is misfiring and scan result brought out error code P0303, bad plug detected and changed and coil checked and it is ok, but error code still persist.

Gurus in the house, please how do I solve this problem? Will appreciate all advice. Thank you

Also had this issue.

Serviced fuel injectors. So far, so good.