2001 olds alero flooding and rough idle

nagad2012

I have a 2001 2.4l oldsmobile alero it was running fine. Then all of a sudden going up a hill the car started to lose power. I just recently changed the plugs and coil, I put new ones in last night since the old ones was covered in carbon. It is using a unreal amount if fuel and it only runs decent at higher rpms.

imidazol97

My first guess would be the fuel pressure regulator. It can leak fuel. Look for youtube video on testing by pulling off the vacuum line. If fuel inside, bad FPR. Then try starting engine letting it run a few minutes with a small towel to catch fuel if it comes out of the open vacuum connection.

Look up the size and shape of FPR on Autozone.com, e.g.. http://www.autopartswarehouse.com/shop_years/pontiac-grand-am-fuel-pressure-regulator-2000.html

It's on the left end of the fuel rail under the air intake at the passenger side of the motor. This video shows it although they are replacing an injector rather than the FPR. The guy pulls the vacuum hose off the FPR at 1:55 into the video

http://www.youtube.com/watch?v=3IWavl_YKuc

Another possibility would the temperature sensor that tells the computer how cold the engine is and adjusts the fuel mixture in the computer from that info. If the car starts and runs great on cold mornings, that could be a symptom the temperature sensor is reading the engine as colder than it is and giving too rich a mixture.

imidazol97

@nagad2012 said:
Got it thanks for the info the fuel pressure regulator was cause the car to flood and one of the coil packs went back

Yeaaaaaa!.

I'm glad that worked out for you to find the problem. It sounds like you replaced it yourself saving money. IIRC that FPR was even more expensive than the one for my leSabre.

Was there fuel in the vacuum line? Or did it spurt fuel after running for a few minutes with the vacuum line off?

nagad2012

Got it thanks for the info the fuel pressure regulator was cause the car to flood and one of the coil packs went back

nagad2012

Fuel was in the vacuum line

imidazol97

@nagad2012 said:
Fuel was in the vacuum line

Your original post contained good facts about what you saw and what happened. That helped give clues to potential problems--over rich mixture due to carbon on plugs.