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Any one ever had an engine ping (pre ignition) when accelerating on a cold first start engine for 3 minutes or so, that stops after the engine gets warmed up?
If yes, what caused it?
If yes, what caused it?
Any one ever had an engine ping (pre ignition) when accelerating on a cold first start engine for 3 minutes or so, that stops after the engine gets warmed up?
If yes, what caused it?
Renix?
Hate to be Captain Obvious here, but maybe the knock sensor?
Pre-ignition has been known to be initiated in heavily carboned-up engines when the excess fuel (normal rich fuel mixture in startup) hits the hot carbon-buildup in the engine combustion chamber. It doesn't take long for the high flame temperatures and the heat of compression to heat the carbon-buildup hot enough to cause fuel pre-ignition, especially with rich fuel mixture entering the engine. After warm-up, the A/F ratio drops back to normal and there is no excess fuel to support pre-ignition. That may be what's happening in your engine. Likewise, after warmup, you may still have some slight pre-ignition that you're not hearing.
Best regards,
CJR
Thanks, that is what I am/was looking for. I was not aware that it was possible with a rich cold mix. But it does have a ton of carbon issues. I guess at wot, and higher RPMs it would get and stay hotter, the carbon.
And glowing carbon can not be controlled by spark timing even with a working knock sensor and working spark electronics, so it fits.
Run a can of BG44K through it.