Rough Start - Something Seems Wrong

optiontrader

I've heard of engines being somewhat difficult to start after 10-15 minutes (like at a gas station), but not after 2-3 hours.

My Honda (del Sol - modified ECU) would exhibit this 10-15 min issue, and it turned out replacing the coolant temperature sensor and adjusting the cold start fuel compensation helped out a lot (but not 100%). My theory was the sensor read good at the extremes, but in between as it cooled down (the 10-15 min range), it would send the wrong temp reading to the ECU, which would incorrectly lean out/richen the fuel mixture upon start up.

But after 2-3 hours? Doesn't seem likely, though I've noticed there is A LOT of stored heat in the VQ37 engine and compartment after the car turns off. I've noticed oil temps still up there after the car's been stopped for an hour.

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