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Engine knocks/pings (Read 3 times)

ckramer

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Engine knocks/pings
Today at 20:48:03

I have 52K miles on a 2013 S40.
all but the first 1100 are mine. It is flawlessly maintained and runs like new, except very recently.

Recently - perhaps since the rectifier quit? - burning out the headlight.. and was immediately replaced - the engine knocks and pings badly at Wide Open Throttle, like while climbing a mountain grade at 65, or accelerating hard out of a curve.

Yesterday I was forced to buy 87 octane fuel in the middle of nowhere (I otherwise always run 92 ethanol free) and the knocking/pinging was awful.

Symptoms quickly resolve when throttle is reduced.

Where should I start? Is spark advance somehow vulnerable? Might the main jet be clogged?

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JOG Serious Thumper Online SuzukiSavage.com Rocks! Posts: 834 Longview, Texas Gender:	Re: Engine knocks/pings Reply #1 - Today at 23:09:03 Timing is pretty much impossible to mess with. Dropping the bowl and checking the jets isn't hard and ya could solve it. If you're not excited about dropping the bowl, since YaKnow the main isn't closed off, maybe run Sea Foam through it. If it's Not a piece of crud and will dissolve,you might solve it without grabbing your tools.
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