92 Olds Cutlass Flooding

[mgrinnell]

Hello All,

 

Yesterday I went out to start up my '92 Olds Cutlass Supreme S 3.1 to move it over in the garage for an oil change. It started up for a second then conked out. Tried again but just went over and over without starting. As I started to dig into it I first checked fuel pump fuse then relay. Both were OK. Fuel pump appeared to be working OK. Opened up engine compartment, boy, strong smell of fuel. Ended up removing air cleaner housing etc and found a bunch of fuel in there. Had even ruined the air filter. Backing up to the throttle body there was a ton of fuel in there. I got the fuel all dried up and let the car sit for a while. Eventually removed the fuel pump relay and fuse as well as fuel injectors fuse. The car started up but then, of course, conked again in a moment once fuel ran out. Put everything back hoping that it was just a fluke but once I put fuses and relay back for the fuel pump and fuel injectors the engine flooded just like before with all sorts of gas coming out of the throttle body. I can start replacing things like throttle body sensor etc but I don't know otherwise what could be causing this. I've never, in 240,000 miles, had any significant engine problems.

 

Any ideas would be much appreciate.

 

Thanks kindly,

 

Mike

Edited April 14, 2014 by mgrinnell

[RobertISaar]

wouldn't be surprising if you had an injector or two..... or six fail open, especially with that kind of mileage.

 

you happen to have a fuel pressure guage?

[Schurkey]

Several possibilities come to mind.

Failed injectors

Failed fuel pressure regulator

Intake valves don't seal

Failed coolant temperature sensor or sensor wiring. Computer thinks its -40, enriches mixture like crazy.

[mgrinnell]

Turns out your first idea was the best -- replaced the ECM hoping that was the fix but really should have realized that it was one or more bad injectors when taking out the fuse for the fuel injectors allowed me to be able to start, albeit briefly, the engine.

 

Thanks very kindly for the thoughts. Much appreciated. My kids call my Olds "Barry" and I'm the only one who drives him.

 

Several possibilities come to mind.

Failed injectors

Failed fuel pressure regulator

Intake valves don't seal

Failed coolant temperature sensor or sensor wiring. Computer thinks its -40, enriches mixture like crazy.

[mgrinnell]

Also a very good call. While I replaced the fuel injectors about three years ago bad injectors are indeed the problem.

 

Thanks kindly for the reply.

 

Mike

 

 

 

wouldn't be surprising if you had an injector or two..... or six fail open, especially with that kind of mileage.

 

you happen to have a fuel pressure guage?

[cutlassman]

In case someone else comes across this thread, I had the same problem and it was the fuel pressure regulator failing. 1992 CS 3.1 L. Fuel was coming through the vacuum line out of the FPR into the throttle body. New FPR fixed the problem.

[Heartbeat1991]

In case someone else comes across this thread, I had the same problem and it was the fuel pressure regulator failing. 1992 CS 3.1 L. Fuel was coming through the vacuum line out of the FPR into the throttle body. New FPR fixed the problem.

 

That was my immediate reaction when I first read the thread. It's almost a sure thing.