Question about 2001 Buick Century
I replace coil pack for #4 cylinder (other side is #1 cylinder), replaced spark plug with new one. swapped plug wire with other one where code did not show up for cylinder. Not sure what to do next. engine light is on constant, if I accelerate engine light flashes (I learned flashing engine light is major). any ideas? looked for vacuum leaks (not found). not checked injector yet.
P0304 is engine misfire #4 cylinder Several things can cause a misfire #1 electrical which you have covered #2 Mechanical Test engine compression is should be around 150 cranking and 120 running . internal valve train components can cause bad compression and the valves then self. #3 fuel injector can be the cause suggest swapping with a know good cylinder and see if misfire follows injector.
Posted on Aug 19, 2014
Testimonial: "wanted to update you. I pulled the oil cap off, I noticed #4 cylinder pretty much right there and found the rocker arm completely still while the car was running. Did the push rod slip? Not sure how difficult to remove the front haed gasket. looks like most items need to be removed. what's the cost and is it worth it."
you could have a bad tork converter clutch and you could have a bad injector. also the new wire or plug could be defective but is not likely. Did you gap the new plug?
Posted on Aug 14, 2009
the best method is one at a time.pull the wire by the boot and remove.then remove other end in same fashion. measure the length of the old wire the the replacement and install making sure that the boots are well seated, you will normally hear a click or feel the boot seat.continue in this fashion until all wires are replaced,then proceed to change plugs one by one making sure that the air gap is to specifications.
do not overtighten plugs ,snug is fine.
Posted on Nov 21, 2011
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