To me it sounds like cylinder 6 is running lean. This would make for a very
hot cylinder and could have melted off the electrodes from the spark plug.
Possible causes: clogged injector, bad intake gasket (these engine are
notorious for them), burnt valve. I would get this problem solved ASAP so
you don't cause serious engine damage.
Which O2 sensor was showing the leak? You car does have more than one. IT
has one before the converter and after. If it is the O2 before the
converter check the exhaust gasket between the pipe and the manifold to make
sure that it is not leaking. This will also cause a lean condition, and
possibly a faulty O2 sensor reading.
I asked the mechanic again what exactly did the scanner read. He said the
left bank reading was lean. He also mentioned that cylinder 6 is miss
firing (I assume that the left bank is cylinder 2,4, and 6). I replaced
the 6th cylinder spark plug. And at first it seamed that starting the
van was a lot easier. But next day engine light was back on and it takes
about 5 tries before the ignition starts. Question can ignition problems
have anything to with this lean reading. Can it be related to the miss
firing problem? If so, If so difficulty starting especially in the
mornings, does that give you a clue if it could have something to do with a
bad sensor as opposed to miss firing problem? I would like to address the
mostly likely problem first or the easiest solution first.
btw: I year ago I had sugar in the gas tank, so I had the tank replaced.
And added some fuel injection cleaner in the gasoline. I have had no
Ahhh, a lean condition, that makes more sense than a "O2 leak".
Left bank is 1,3,5. A misfire on six should cause a rich condition on right
bank which the computer could misinterpret as lean on the left.
After having it fixed the light came on again.....that doesn't mean the same
trouble code is reset. Could be something else this time.
An injector sticking can cause a lean condition.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.