P0172, P0175 too rich, 07 6.2 about to throw in the towel

[Jsdirt]

Something to think about ...

 

Rich codes that never go away are also a sign of a worn out engine. I'd do a compression & leak down test at this stage to see where you're at - compression at the very least. Hard starting & a rough idle go hand in hand with low compression.

 

Stabilitrak codes are unrelated to this - normally ABS issues, or steering position sensor problems will cause that. A very common issue with these.

[chucksrt]

The stabilitrack light coming on just tells me that a code just set in pending. In this case the code that set was for the P0172, P0175. If it ends up being a worn engine issue then i will take it back to the dealer because my extended warranty covers that. I don't feel as if i have any loss of power while driving and i would like to think that thecodes are related to the hard start but i am pretty sure they are two different issues. But i am not really familiar with this returnless fuel system.

 

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[chucksrt]

GM doesn't have a fuel pump listed for a non flex fuel vehicle. Does anyone know if they are the same pump as the flex fuel

 

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[Jsdirt]

Don't go replacing stuff unless your 100% sure of the problem. I had to re-read alot of this, since I've forgotten the chain of events here ...

 

You very well may have fixed the rich codes with the EVAP purge valve replacement. You need to see EXACTLY what pending codes exist. Stabilitrak issues are more than likely from an ABS sensor issue, or steering sensor issue ... but that's not your original problem - need to focus on that first. Need to verify a fix (or not) with scan tool.

 

If the check engine light isn't on, then there are no codes in the system. Need to get in there and check for pending codes, if any - just because the Stabilitrak light is on doesn't mean there are pending codes for anything else but that system itself.

[wildcatter]

I agree, forget about the stabilitrack for now and sort out the problems at the tank.Did you find the source of the fumes? get a scantool on it and find out what codes are still there.

[chucksrt]

The P0172,P0175 codes did come back. I don't know if the two issues are connected or not but the extended crank seems to have gotten better, not good but better since replacing the vent valve assy. It may be a placebo effect? If I am understanding it right there are only two things that could cause the extended crank, leaking injectors ( which were just cleaned and flow tested) or the fuel pump. As for the codes i am completely at a loss as to ehat is causing them.

 

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[chucksrt]

I agree, forget about the stabilitrack for now and sort out the problems at the tank.Did you find the source of the fumes? get a scantool on it and find out what codes are still there.

I have not smelled the fumes again since that one time.

 

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[chucksrt]

My gas guage just acted funny. I started the car and it said low fuel and i could swear i had over a quarter tank. I finished my trip, turned the vehicle off waited a second and turned the key back to the run position and sure enough the guage read over a quarter tank.

 

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[Jsdirt]

As far as the running / starting problems go, you could have a bad "new" MAF sensor. At this stage, that seems to be the only suspect component. Need a multimeter that reads Hz (Hertz) to properly diagnose.

 

Here ya go: http://easyautodiagnostics.com/gm/4.8L-5.3L-6.0L/testing-the-maf-sensor-1

[chucksrt]

As far as the running / starting problems go, you could have a bad "new" MAF sensor. At this stage, that seems to be the only suspect component. Need a multimeter that reads Hz (Hertz) to properly diagnose.

 

Here ya go: http://easyautodiagnostics.com/gm/4.8L-5.3L-6.0L/testing-the-maf-sensor-1

Awesome link. I am pretty sure my meter does hz. I am also going to pick up a fuel pressure guage today.

 

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[chucksrt]

UPDATE!!!!! I replaced tje fuel pump and it seems my check engine lights have stayed out. I don't know if it was something with the pressure sensor or the fuel pump itself but it has been trouble free for nearly a whole tank.

 

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[Jsdirt]

I believe the regulator on that system is part of the pump assembly in the tank, since it's a single-line system. You could've had a bad regulator that was allowing excessive fuel pressure to the rail - I can't remember if you checked the fuel pressure or not prior ...

 

Either way, glad to hear you've made headway on this one!