Engine flooding with key on... - Defender Source
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  #1  
Old October 23rd, 2011, 11:38 PM
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Chris Davis
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Engine flooding with key on...

If I have my ignition on (in the start position, right before the crank-the-engine position), the truck floods and I can't start it. If I stop the engine and leave it in this "on" position, it also floods. If it is there just a few seconds, no problem, but leave it for a minute or two, it floods.

My guess is that the fuel injectors are either leaking or not shutting off or something like that. Any clues?
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  #2  
Old October 24th, 2011, 11:52 PM
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Chris Davis
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Is it possible that a single leaky injector could flood an engine (I would suspect that the other cylinders would just push past it)? I am not sure if looking for a leaky injector could result in a flooded engine which makes me think something else. The truck runs perfect when it isn't flooded and when fuel pump is behaving normally--on for a few seconds then off for the duration...
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Old October 25th, 2011, 12:01 AM
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steve
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I had something remotely similar happen years ago when I had a 3.9.
If I would leave the key in in the on position it would fire the injectors as if it were running. You could hear them squirting.
Turned out to be the ECU, I swapped it and it cured it.

Dunno if that helps but I thought I would mention it.... good luck
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  #4  
Old October 28th, 2011, 06:13 PM
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Chris Davis
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Swapped PROMS first as well as ECU's so I have ruled that out. Still a mystery
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Old October 29th, 2011, 05:31 AM
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Jamie Austin
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Quote:
Originally Posted by Davis View Post
Swapped PROMS first as well as ECU's so I have ruled that out. Still a mystery


Or does it? I've heard storied about the 3.9 ECUs causing the injectors to stay open... it's only a large triac that keeps the injectors open (each bank) so you could have the same fault on both.


Maybe worth trying your "good" ECU on another engine and just check it out to be 100% sure.


try removing the plugs from the injectors, stick in a voltmeter and see if they're getting power... that way you can eliminate the injectors themselves (would be rare, i'd have thought, to get 4 on one side all leaking together) or see if there's continous power coming from the ECU.
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Old October 31st, 2011, 10:06 AM
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Chris Davis
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Good advice, I'll check it out. I don't know if the ecu itself or the chip controls the injector (sounds like the ecu does), but I've tried pendy's after market chip as well as a 4.2 cd prom in both my 3.9 d90 ecu and 93 RRC ecu. I'll check the voltage--- thanks for the advice!
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Old October 31st, 2011, 03:20 PM
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Jamie Austin
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The chip will just tell the triac when to operate to control the injectors.... so if the triac itself is duff (it's just like a large transistor) then any other chip won't make a difference to it; it'll still be opening the injectors.
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