Originally Posted By: Danh
Parshisa, you are still the only owner of a Honda 1.5T UOA I’ve seen that didn’t show high levels of fuel dilution.
As you may be aware, there’s quite a bit of complaining from 1.5T owners in cold weather climates here and in China about rising sump levels, triggered CELs, stalls, and at least one engine replacement from this phenomenon. Owners in China have made life miserable for Honda, blockading dealers and the like and forcing Honda to react. Honda in China issued its response today, which said (as far as I can figure given the translation):
1) Fuel is introduced into the engine oil by slipping past the piston rings
2) In normal operation, sump temperatures volatize this fuel and it’s then burned in combustion (via PCV, one assumes)
3) If oil level gets more than 21mm above the full mark on the dipstick a CEL may be triggered
4) Honda has found no engine damage occurs from this phenomenon. In China at least.
5) An ECU reprogram will be performed, but the effect of this is seemingly (tranlsation?) limited to making the engine warm up faster so volatilization can occur.
All well and good, but:
1) It doesn’t deal with the root cause of fuel dilution, so fuel will continue to enter the sump in some abundance
2) It ignores the permanent damage fuel can do to engine oil even if it volatiles
3) It ignores the rather large % of gasoline that will not volatilze at typical sump temps
4) Honda is essentially acknowledging significant fuel dilution is a normal characteristic of this engine
In other words, a typical Honda response to a problem. Until a class-action lawsuit at least.
You don’t seem to have the problem, whether from being lucky with manufacturing tolerances, break-in, driving style, country of manufacture, fuel grade choice, etc. But at least you know as long as your sump level isn’t more than 21mm above full, you’re golden.
Honda can solve some of these problems with a TWO injector per cylinder engine. Direct injection and one also in the standard location in the port behind the valve. I live in Minnesota and use a car starter mainly to get the oil up to a better temp before scooting off to work. This is where the conventional injector should be used on warm ups to reduce gas in the oil and then go to the DI injector when up to temp.
Maybe a slight oil pan insulation cover during winter would help keep oil temps up to flash off "some" fuel. Rotary screw air compressors use 190 F temps to flash off water in their oil as standard operating procedure/design.
Every manufacture should SOLVE this problem ASAP and not wait 20 years to put the two injectors design scheme into use. DO IT NOW.
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