SOURCE: 2000 Camry 4 cyl 2.2L.
sounds like you have a problem with the spark the coil may be on its
way out or there may be oil in the spark plug holls shorting out the
spark.
your best bet is to pull the leads out 1 at a time and and look down
and check for oil if there is oil there get a new rocker cover gasket.
if no oil refit plug leads loosely and start the car remove one lead at
a time slowly and look at the spark cumming out the end off the lead is
it blue? if so it is ok if it is yellow and dull you have a coil
problem. also check that the spark is only coming out the end of the
lead as it may be coming out the side of the lead and shorting to earth,
you can do this by slowly moving the lead around the top of the spark plug holl and see were the spark is coming from
be carfull no to shock your self as it hearts like hell
good luck
SOURCE: 99 4runner 5vz-fe 3.4 misfire
I know this post is old, but right on the engine theres a sticker that says use multi-ground plugs only. I read a similar problem like yours and it seemed to turn out that the spark was arcing to ground over the ceramic on the plug. So maybe it could have something to do with the single ground plugs.
SOURCE: 2001 Toyota Camry - check engine light on - code
Hello: Code 420 normally indicates a catalytic converter is operating below 60% efficiency. You need to take your car to another shop and request a COMPLETE diagnosis not a dart board guess.
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