Quote:
Originally Posted by Carwhisperer
The service manager told me ethanol is terrible for the stock DI's. Is gas just crappy in around the west coast area? The SM said a bad tank of gas can easily cause this as well, not matter how you drive it on pump gas or e85.
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Shouldn't matter, you should be able to run this car on 87 E10 with no issues, otherwise there is a problem in the design. With how tightly controlled the creation and shipping of gas is in this country "bad gas" is practically a myth at this point, it's very rare.
It will run better and last longer with the correct gas but this isn't anything you should even be
thinking about under 150k miles with a stock vehicle, even if it does see the track once every month or two. More aggressive than that though and you start asking for things to break (eventually over time in a reasonable fashion, track duty wears cars out faster no matter what anyone says).
It sounds like there's some confusion as to whether this knock occurs before the injector seals fail or if the knock is a symptom of the seals failing due to high temperatures.
As always insight is appreciated, super nervous to sign up for a track day even though I've been wanting to do it for months now...
