code P0174

[dkhusker]

Engine hesitation or stumble during acceleration, please help.
Could be fuel pump, spark plugs, injectors not sure.

 

[milkman]

I would check the plugs and then wires for any arcing, if still present i would put a stethescope on each injector listening for ignition, then on to the more difficult of the 3 i would get a new fuel pump, or maybe just a new fuel filter first.

 

[dkhusker]

thanks will try in the morning, hopefully not the fuel pump

 

[milkman]

i cant find the P code errors in the factory service manual to give you further help, i hate these books....

 

[paart]

That code may be: "Fuel Trim System Lean Bank 2", which isn't real helpful, but could point to an injector issue, particularly if no other codes are shown.

 

[dkhusker]

it does say lean in bank 2, which side is bank two, and do i replace all injectors?

 

[Krzdimond]

bank 2 is passenger side and you should replace the O2 sensors before you jump to the injectors

 

[paart]

Bank 2 is the right (passenger side) of the vehicle. I would start by checking the fuel system pressure at the port at the rear of the engine. That should rule out pump or filter problems, before you start looking at the injectors themselves. Are no other codes set at all? I'd also suspect the O2 sensor, but it should also set a code---but you can't always depend on that.

 

[planenut_2000]

Remove the oxgen sensor on the RH side, if it's really black with soot then replace the oxgen sensor. If the sensor is light tan colored then look for a vacuum leak on the RH side of the engine.

 

[MrBuick (Magnum)]

I would replace both front O2's regardless. If it has close to 100k, and they are stock, its time to put some new AcDelco's in there. Juse because an O2 sensor "Looks Ok", doesn't mean it is. These are a wear item that should be replaced as part of the tune up.

 

[planenut_2000]

Trying to diagnose a problem, not just throw parts at it!

 

[milkman]

part of diagnosing is throwing parts at i, start cheap!

 

[paris63]

How hard are the O2 sensors to change on the LT1? (I don't like fighting the big girl!)

 

[paart]

I don't like fighting with her either, because I usually lose! Oh... wait, you are probably referring to your car!
Changing the O2 sensors shouldn't be too bad, if you have ever changed any on another vehicle. I haven't changed them on my Roady, but have looked at them, and they are fairly accessible, although one side (I forget which) looks a little harder to get at. A special O2 sensor socket would probably be a good idea.

 

[MrBuick (Magnum)]

You can rent an O2 tool from Autozone. Which what I normally do. The cheap ones you buy at the parts stores don't work for shit.

The drivers side is a little harder to get to, since the cat is up farther, and hat an angle. You need to get the car up high, since I always seem to need a pipe on my ratchet. If that doesn't work, I have used big vise grips to remove them. Soak them with PB blaster or the like, and remove them with the pipes still hot.

 

[dkhusker]

not the sensor, has to be one of the injectors on the left bank, was told could be an injector drip, cant tell with a stethascope, may have to change them all

 

[paart]

Right bank.---drivers side, if you posted the correct code. I'd take a look at the plugs on that side to see if there's a clue as to which one it is. Injector dripping would probably cause a rich, rather than lean situation.

 

[Krzdimond]

ALL DIRECTIONS ARE GIVEN FROM THE DRIVERS PERSPECTIVE

Right = passenger

Left = Driver

 

[paart]

Yes, correction---Right side --passenger side, as I had posted earlier.

 

[planenut_2000]

p0174 is a lean condition! not a dripping fuel injector which would be a rich condition!
If the ecm says lean, and you remove the Rh oxygen sensor and its black then the sensor is bad. If you remove the sensor and it's not black, but more a tannish color then the ecm is correct, start looking for something causing a lean condition on just that bank. Such as a vacuum leak, a non opening injector, exhaust manifold gaskets allowing air into the system. BUT you must first determine if your truely rich or lean on that bank!!!!!!!