I have a 05 manual trans with 63K I keep throwing a PO303 code cylinder 3 misfire.
It started last Saturday after riding in the rain at night I dried everything off and let it dry on Sunday with the engine cover off and coil packs removed just in case.
When I put it back all was good for about a day now it comes and goes.
So I changed the plugs the old one looked good less than 20K on them still the same code.So I swaped the coil packs from 2 to 3 to see if it changes still #3 misfire.
Ok this leads me to believe it is either a injector or a sticking valve.
So On wednesday I filled the tank and added a can of SeaFoam and no change So this afternoon I added half a can to the oil to see if I had a sticking valve still the same.I am out of options on what to try next Injectors are about $100 each So I would rather not just hope it would fix it.So if anybody knows what vehicles have the same injectors other than the Echo I will go check the bone yard for doners before I spend a fortune on a prayer.

Thanks for reading,Scott

 

I have a mechanics stethoscope with a steel tube on the end for listening for engine noises. If you can get one. With the engine running, put the stethoscope tube on each injector. You can hear them firing, if ones not firing you can hear the difference and know the injector is bad. Usually the diagnostic test will have you check the power,ground and signal wires and connectors and pins in connectors also. Hope this helps.

 

I have never listened to it but I did read voltage on the connector to see what voltage it was running at I get about 1 volt at idol and 2 volts when reving it up some.
I got the same on another one so I assume it is correct.


Scott

 

id say check the wires that connect to the coil pack cuzz for me i had a torn wire or two and i had to take apart the plug and what not and solder it back