1998 SC2 Hot Day & Spark Knock with 87 Octane

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1998 SC2 Hot Day & Spark Knock with 87 Octane

This is a hot day driving around town with the air conditioning running.
The second graph shows Knock Retard.
Well, I'll be darned if the engine really does knock with 87 octane.

Notice the graph 8th from the top. - My Thermostat is partially stuck OPEN: Coolant temperature is dipping to 183 degrees Fahrenheit. It should be 190 to 195 Deg. F.
My Air:Fuel ratio is still at 14.7:1 (Not shown in this set of graphs).

My dad's '98 SW2 Thermostat operated at 178 Deg F and his Air: Fuel Ratio only reached 14.3:1, instead of 14.7:1

bumpdraft

Master Member

Registered: April 2006
Location: Michigan's L.P.
Posts: 2,063

Date: Mon, July, 2, 2007
Keywords: 1998 sc2 hot day amp spark knock with 87 octane

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