flooding lumina

[birdman]

i have a 92 lumina euro 3.4 and it floods 70% of the time when it runs rough the time before. sometimes it will start and run ok but if it runs rough it floods and wont start till the next day. any help would be great because im afraid to go anywhere in fear of being stranded.Thanks.

[93Oldsdroptop]

RE: flooding lumina

Bad fuel pressure regulator perhaps?

[birdman]

ive heard that from several other people. how hard is it to replace and can you do it without removing the upper plenum? if any one else has other ideas or also believe its the fpr let me know please.Thanks.

[Kohburn]

regulator possibly but they don't usually go bad - could also be bad injectors leaking or sticking open

[93Oldsdroptop]

I'm not sure if you can do it w/o removing the upper plenum. But if you can get to it and you pop off the vacuum line, if there's gas present then it's bad and that's your problem. Or if you attach a vaccuum sucker and it won't hold, there's a hole in the diaphragm and it's bad.

[birdman]

i looked today and theres no way to even see the fpr. i was thinking that mabey when i changed the plugs that mabey i knocked off the vacume line??? would that do the same thing as if it was broken? and how can you tell if you have sticky or leaking injectors, i put injector cleaner in the gas because that was one of the first things i thuoght of.

[series8217]

I had a similar problem with a 2.5L DIS motor. Turned out to be a damaged ECM. The traces for the fuel injector circuit would intermittently short, causing the fuel injector to dump fuel into the TB and stall the car. If I tapped the ECM and tried to start and run it again it would work until the ECM vibrated enough to mess up the trace again.
The reason the ECM became damaged was because the coating on the board shrinks over time and eventually tears the board apart slightly, but enough to damage traces. If you have a spare ECM, swap it in and see if the problem persists. If it goes away, its probably wise to just buy a rebuilt ECM since your spare may be just as old as the bad one and be on its way out also..
Keep in mind it may not be the fuel injector circuit that is bad, but also possibly the circuit for a sensor or something that influences the fuel mixture. If you had a scantool you could check for erroneous values..