#3 misfiring
 

Hi everyone
I have a problem with a 99 S80. Rough idling and poor acceleration. Message says emission control servicing or something like this. I scanned and it gives me a 0303 Cylinder #3 misfiring.
If I disconnect the wires to the coil I get no change in RPM but if I diconnect #4 wires the RPM goes down a bit. I switched #3 and #4 coils and #3 is still the problem. I switched the #3 and #4 plug and #3 is still the problem. I want to rule out the injector cause the catalictic smells real bad like unburn fuel (rotten egg smell). It's either a locked open injector or bad wiring feeding the coil?

Hope somebody had a similar problem and can direct me to the problem.

Thanks in advance for the help.

Reggie

I realy need help any idea Tech

Problem solved, when I swaped the 3 and 4 coils I put them back at the same place by mistake. This afternoon I went out and did it again and found a bad coil. $78 for a new one at a dealership, not bad to solve the problem now the car runs nice and no code.

Sorry was working.

Thanks Tech
 

I'm sure I'll be back soon to seek more help. Of course it's a Volvo but I love the car.

Thanks again
Reggie