Quote:
Originally Posted by switchlanez
The cause of the noise per the TSB is the high pressure fuel pump. The TSB also notes you may hear another ticking noise - caused by D-4S - which is completely normal. They are two *completely different* noises which you seem to be misconstruing as the same.
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That's not true. I'm talking about Crickets. What does the TSB say needs to be replaced to fix the Crickets? Answer: HPFP. What uses a HPFP on our cars? Answer: Direct Injection What is the Direct Injection system called? Answer: Toyota D4S.
Conclusion: Crickets are a result of TOYOTA's Direct Injection D4S HPFP. Which makes the crickets in this car unrelated to the crickets in other Subarus that don't have Toyota D4S.
Is that a fair conclusion? I feel it is.
Quote:
Originally Posted by switchlanez
About ethanol... the manual states not to use ethanol mixes > 10%. I could ALWAYS reproduce the cricket noise before. After I switched to ethanol-free 93 octane, I could NEVER reproduce it. What kind of conclusions should I draw from these observations? Should I ignore these *hard facts* because people on this forum are "smarter than that"?
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I know you are "smarter than that". Drawing a conclusion based upon the sampling of only 1 unit from the entire pool isn't exactly solid evidence and no scientist, engineer or random geek would say it is.
My experience is DIRECTLY inverse of yours. I ran 3 tanks back to back with E0, still the same level of crickets at the same randomness of intervals as with tanks of E10. Octane here is 92. So now you have opposing data from 2 units of the entire pool. What conclusion do you draw now?
The conclusion I draw is that the TSB
identifies the noise as a mechanical part but also mentions temperature and formulation. ToyoBaru has a greater sampling of the total pool than anyone on this board does and they
physically identified the failure (or occurrence) as being mechanical.
The word "formulations" isn't specific enough and could mean anything: E0, E10, E85, toluene, AVgas, race ruel, 91 octane, 93 octane, etc etc..
And let's use the
whole wording eh?
Quote:
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It is a result of the positioning of the plunger stopper inside the HPFP. Some may have a plunger stopper position that when combined with certain fuel temperatures or formulations, may result in aeration of the fuel within the body of the pump causing this sound when the engine is idle.
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"When combined with".... "temperature
or formulation".
I find it ridiculous to conclude as a matter of fact that ethanol is the definitive cause like you have. Especially in the face of contradicting information from other owners and the TSB itself.
Stop... Just stop.