Obscure facts
On a stock 944 NA, true detonation at idle is possible in theory but it’s not something you normally see unless there’s a real underlying problem (bad gas, too much timing due to a bad reference, very lean condition, heavy carbon raising effective compression, or overheating). Off-idle/light load is where you’d be more likely to hear it.spacecad3t wrote: Haha you caught my spelling mistake, nice! Yes I mean detonation and assume the car is a stock 944 NA.
It usually won’t present as “higher running temps” on the dash gauge in a direct/fast way. Sustained knock can add heat overall, but the coolant gauge responds slowly and is influenced by airflow through the radiator, thermostat behavior, and sender/gauge accuracy.
Running rich won’t stop the fans from cycling if coolant is actually getting hot. On an 85.5+ 944, fan cycling at idle is governed by the two-stage radiator thermoswitch (95C/102C), independent of AFR. If the fans never come on sitting still, that points more to the thermoswitch/circuit or coolant flow/air in system than mixture.
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