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Old 04-13-2012, 04:14 PM   #1
turbobuick33
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Default Do all Saturns have a clear flood mode?

Do all Saturns have a clear flood mode? What is the purpose of the clear flood mode?

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Old 04-13-2012, 05:24 PM   #2
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Default Re: Do all Saturns have a clear flood mode?

Yes to the first question. The answer for the second question is for the occasional flooded engine that will occur if the usual characteristic of all EFI systems doesn't result in an instant start in a few seconds. For whatever reasons doesn't result in an instant start, several more attempts at starting a cold engine continues to spray a rich fuel mixture within 30 seconds of accumulated starting. This is based on no throttle application at all times. Whether using the starter in short bursts or several long attempts at starting, the EFI system always injects a rich fuel mixture for cold engines. Within minutes of several failed starts the engine is quickly flooded since the engine hasn't run yet. Clear flood mode is designed just for this situation.

In starting mode, the engine is turning over slowly so the speed sensor tells the pcm the engine is turning over slowly. The coolant sensor is sending cold temperature signals to the pcm. If the gas pedal is pressed all the way to the floor the throttle position sensor is telling the pcm 'wide open throttle'. The three sensor inputs are used to allow the pcm to determine that a programmed routine is needed - clear flood mode. The pcm shuts off/disables injection pulses while the tps is sending a wide open throttle signal. With a very rich or flooded engine, the lack of fuel injection pulses now allows the engine to continue drawing in air but without any more fuel until the cylinders dry out. Spark is still occurring and what was several shorted spark plugs from wet fuel is now drying out to allow spark to jump across the gap. In the time it takes to read this post the engine should begin sputtering slowly and quicken until a normal start up results. Holding the throttle open will allow revving but its prudent to release the pedal for a normal warm up.

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Old 04-13-2012, 05:25 PM   #3
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Default Re: Do all Saturns have a clear flood mode?

Most, if not all, EFI cars have clear flood mode.

"Flood mode" happens when something make the PCM/injectors dump too much fuel into the engine. Unlike the old stupid carburator engines you don't have to wait hours for the excess fuel to drain down, just floor the pedal while cranking and the fuel will burn off without having more fuel dumped in as it turns off the injectors.

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Old 04-13-2012, 06:40 PM   #4
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Default Re: Do all Saturns have a clear flood mode?

Quote:
Originally Posted by fetchitfido View Post
Most, if not all, EFI cars have clear flood mode.

"Flood mode" happens when something make the PCM/injectors dump too much fuel into the engine. Unlike the old stupid carburator engines you don't have to wait hours for the excess fuel to drain down, just floor the pedal while cranking and the fuel will burn off without having more fuel dumped in as it turns off the injectors.
But that is the exact same way you quickly clear a carb'd car (which is why I assume the engineers used that technique). In a carb'd car you just hold the gas down while cranking. You'll push all the excess fuel out and the car will start.

In the almost 10 years of owning my SC2 I have never once had to use this technique though. It always starts instantly in any conditions.

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Old 04-13-2012, 07:05 PM   #5
ssewall
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Default Re: Do all Saturns have a clear flood mode?

Some ninties Jeeps don't have clear flood mode.

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