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Old 02-10-2013, 12:55 AM
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Originally Posted by svt2026 View Post
Whats ST/LT?

I have the 1v Knock sensor and misfires happen then the thing gets pegged, so I'm assuming its related.
Short Term/Long Term Knock Retard are PID's on your tuner you should be monitoring closely. It is how much the PCM is retarding the timing (in degrees) in an attempt to counter spark knock that is occurring. This is VERY bad for your engine! ST KR's are how much timing is being pulled immediately, and LT KR's are how much timing is being pulled preemptively based on PCM's memory of ST KR's. Ideally, you would have no ST/LT retard at all, but ST KR's of a few degrees (2-3) @ WOT is often considered acceptable. You should NEVER have LT KR though, as this is hurting performance, and is an indicator that you have excessive spark knock occurring which could damage your engine.

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