I have a 95 850 glt non turbo 2.4 and I keep getting a misfire code on cylinders 3 and 4 and random multiple misfire and multiple misfires po300 and po310. I have replaced rotor cap and wires and plugs I've cleand the EGR valve also cleaned the idle air control valve and I still get the same codes and a rough idle but runs fine after about 1500 rpm. can anyone help? any suggestions would be appreciated thanks. Brian

 

Hi Brian, welcome to the site.

Have you checked your fuel pressure? Also, how many miles do you have on the car?

 

Need to check compression.

 

I think it has 200,00 and no I havent checked my fuel pressure

 

I have heard the compression I guess I will do that I have a feeling thats what it is

 

what should the compression be on at a minimum on each cylinder?

 

For NA 5 cylinders, 1.3 - 1.5 MPA which is about 188 PSI - 217 PSI.

Test should be performed on warm engine with all plugs pulled and at wide open throttle. When I check mine, I pull the fuel pump fuse with it idling to bleed off pressure, and unclip the harness from the coil so there is no spark. I don't like fires.

For future reference, 2.3 turbo motor compression is 1.1 - 1.3 MPA or about 160 - 188 PSI.

 

thanks I will try that tomorrow