Idle issue and long cranking times

[Mean Green]

Okay so I just pulled the code and its throwing a code 44, which means: Oxygen (O2 Sensor Circuit (Lean Exhaust Indicated))

My interpretation of that, is that the 02' sensor is not necessarily bad, but the motor is running to lean which indicates a fuel problem. Is my thinking correct? Or is it simply a faulty 02 sensor?

 

[Horns]

I think you are correct but I would check fuel pressure just to make sure.

-Sent from my twin turbo Desire using diesel fuel.-

 

[Mean Green]

I think you are correct but I would check fuel pressure just to make sure.

-Sent from my twin turbo Desire using diesel fuel.-

I will be checking the fuel pressure asap. I managed to locate new AC Delco fuel pumps for $49.95 online!

 

[Mean Green]

Threw a SES light came on twice tonight, put about a 100 miles on it today and averaged 14.7 mpgs mixed highway/city driving so millage hasn't suffered at all. I think im going to replace the O2' sensor first, check fuel pressure and then most likely replace the fuel pump regardless for piece of mind.

 

[Mean Green]

Alright, so I haven't had a chance to replace the fuel pump as im waiting for the new sending unit assy. to come in. But im starting to doubt its the fuel pump now. Its becoming almost un drivable. It almost always kills when shifting into reverse, unless you give it throttle.

I still get a code 44, but I don't feel that the o2' sensor would cause it to run this poorly. It does however seem to run worse when it gets to operating temp.

Need some ideas guys! Aside from fuel pump, what are your thoughts?

 

[1997chevydriver]

Unplug o2 sensor and try it.

Sent from somewhere in MN