Toyota dealer suggested a $20 fuel system cleaner, but I already put some
Techron in at the suggestion of a friend. It cleaned up his O2 sensor and
eliminated the error code. The engine is running a bit smoother, but not
right yet after 100 miles. I've had Sea Foam suggested by a mechanic, but
haven't seen great results. Any other suggestions on something that will
work? Engine is running a bit rough and no, I can't change the fuel filter.
It's in the fuel tank :(
When did you last change the plugs?
Did you follow the directions on the Techron? Most cleaners have a mix
ratio that is a LOT higher than one can per tankful of gas. Most call
for one can of cleaner per 5-10 gallons at the most.
Have you ever done a top end cleaning? This one involves taking a vacuum
line off and letting the engine suck in the cleaner till it quits. Then
let it soak and restart. It blows a LOT of crud and smoke out of the
tailpipe so don't do it inside.
Actually it cleans them at the tip and clears the carbon and crud out of
the combustion chambers as well as the intake valves and exhaust valves.
You would be surprised how much crud builds up and it doesn't take much
carbon to cause a rough running engine. A couple small pieces holding a
valve off the seat or sticking out in the spray pattern of an injector.
Cleaners usually don't clean O2 Sensors, they die from silicone poising.
As for fuel system cleaners, I found Berryman and Techcron to do a good
With any cleaner, they will cause deposits on the plugs, so a plug
change after cleaning is a good idea.
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