MISFIRE #6 on 2003 Cadillac DeVille


by in Phoenix, AZ on June 28, 2011
3 answers
ANSWER by on June 28, 2011
you need to determine why it is missfiring. it could be a bad plug, a bad coil, bad injector, vacuum leak or low compression. this is why you need a real diag to determine the failure and move forward from there. Roy
ANSWER by on June 28, 2011
If the compression is ok, in that cylinder and there are no injector codes or ignition system codes, I usually look at the ignition parts, if the wires and plugs look old, I start by doing a basic tune up which is to replace the plugs and wires with AC Delco parts. Cheap parts will just cause you more grief! Then I re-inspect how well the engine runs.
ANSWER by on September 22, 2012
I have a 2003 Deville and got exact same code. I replaced the ignition coil bank (front coil pack). Under each are 4 short spark plaug wires. under which are the spark plugs. It may be a good time to replace them If It Is time. The rear bank is a bear to replace. The front bank where cylinder number 6 is located is easy. I used every method od diagnosing with OBDll diagnosis tools. I finally just took a leap of faith and I was right.
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