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I have a 1990 seville 4.5 fpi motor I have changed the plugs wires rotor button and the distrubtor cap. it is in the right firing order but I get a lot of mis fires and I loose presure when driving sometimes I can onlygo 10 mph I had the disturbtor set and it ran worse.I ran the computer codes and got EO30 EO52 EO53 B120 B121 B552 can anyone give ne an idea of whats going on. the car mwas running fine until I got all new wires plugs rotor button distrubtor cap and got the time set.

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what plugs? ACDELCO?

You did one ignition wire at a time? How do you know you put the wires correctly in the cap?, did you do one at a time?, could it be 180 degrees out?

Was the correct timing methodology used?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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followed diagram on block for wires had madas set the time wires are 1,8.4.3.6.5.7.2 going counter clockwise

Did you go counter clockwise from the correct starting point on the distributor?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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