I have a rs 3.1 that i just replaced the fuel pump and filter in and now it idles rough and has no power when accelerating and dies some times. I know the car is running lean because i saw smoke coming from under the seat and i looked uner the car and the cat was glowing. I think it may be the o2 senser anyone know anything i can do?

 

Did it start idling rough immediately after the fuel pump/filter job? Or was that recently changed? Is the flow direction correct on the filter, they are designed in one direction.. though I dont think it would be a problem.

If you can test your fuel pressure, that would be best.

you could have another issue though... I have had BAD luck. Somehow my fuel pump and my crank position sensor died in the same moment on an 89 Beretta i had. It really didn't make any sense whatsoever, though I knew they died together because the car won't run without either one. Strange coincidernces are, well, strange.. but they do happen.

Anyhow, I don't know that the O2 sensor being off would allow the car to force itself so lean that it would be that bad... though I don't know personally. Try disconnecting the O2 temporarily and see what the car does. If it is the O2 forcing it lean, lack of O2 will make it revert to a more standard setting hopefully. When in doubt, test without. lol

 

bought the car bout a month ago and guy said it needed a fuel pump so he let it sit fo 5-8 years. so i put a new one in it and now it runns super lean. I drove it and i took it back to the dude who helped me do it and he said the o2 sensor was probly chacoaled and that will probably fix it if not i will need ecm

 

so jus wanderin if any1 has had similiar problems or has sugestions

 

bump

 

help any1?

 

Check the fuel pressure at the rail and make sure it is up to spec. Low fuel pressure would cause it to run really lean in open loop modes.

 

if that is the problem how could i fix it

 

Did you replace the small hose that connects the fuel pump to the sender? I had the exact same problem when I put a new fuel pump in , When I rechecked the new fuel pump the hose was split in the tank. It would start & idle, but no power & the cat was glowing. It cost me about .50 cents & 30 minutes to replace. ( I did the access panel above the sender when I originally replaced the pump) The car runs great now!

 

well i replaced the whole sending unit is it the hoses that connect to the sending unit