I have a 2000 blazer and after replacing spark plugs wires cap and rotor and injectors on that side i still have one whole side of the cylinders misfire it is the left side. It is getting a good spark i can not figure out it out any ideas

 

*I have combined the three separate threads you had concerning these issues. Please try to keep related problems in the same thread so we can follow the progress.*

 

Ok i finally tracked down a code reader the codes it is given me is p0304 cylinder number 4 misfire p0420 ignore that one i do not have a cat converter so it has always been on p0452 evap fuel pressure input low and it is giving me the p0304 code twice for some reason any ideas, and to those who told me to read the codes first and i said i know what code it would give me i am sorry i was wrong should have got the code reader sooner

 

Do you have any exhaust leaks between the engine and the passenger side O2 sensor? If so, this could cause a false lean condition which would cause a rich condition on the right bank.

 

well i hooked up a compression gauge up to cylinder in question and it was barely reading 25 lbs on it so i am pretty sure it is a burnt exhaust valve

 

Yeah, that's low. Could be a valve or broken rings. Did you try putting some oil in through the plug hole and see if that improves your compression? If it does, the rings on that cylinder are shot.

You could also put air pressure to the cylinder when both valves are closed and listen for air either escaping from the exhaust, intake, or crankcase.

 

yeah i tried putting oil in it it barley raised at all so it has to be a burnt valve, now i am pretty sure replacing that is going to be a pain i am correct in assuming this

 

Ok after two very exhausting days of taking that motor completely apart, (which after doing so I think I might have a personal vendetta against the guy who designed it) i found out it was indeed a bad valve in cylinder number 4. It was bent crooked, I had never seen anything like that, but anyway replaced it and it running good.