I've had problems with valves burning on this engine in the past. It has 215,000 miles and recent valve job (15k ago). Getting a code 21. Seems that before I had the valve work done I was getting a 21 code that would come and go (usually went off during hiway driving). Then the code I began getting was the dreaded 52 code.
My question is: is it a problem with the valves again causing no combustion in one of the cylinders that can be causing the 21 code or is the O2Sensor bad and not sending appropriate adjustments to the injectors? Can a bad injector cause valves to burn? Or is there something else I can look at that might be causing an improper air/fuel ratio? I will probably end up getting a compression check done, but would like to know why these engines burn valves so much and is there anything I can do about it?
have the same problem?
Saturday, February 10th, 2007 AT 5:17 PM