P1175/P1172 as a result of running D2 engine cold. Need advice

[MichiganMat]

Hey guys-

About 6mo after I bought my D2 I found I had a coolant leak someplace. Being the professional that I am, I decided to put a leak-stop/dye fluid into my cooling system to help me find the leaks...

Long story short, one day the check engine light comes on and I soon notice that the engine temp never reaches mid-range, runs cold. I put in a new thermostat, flush the system, and reset the codes with newly purchased scanner.

Ever since then, the truck has thrown P1175 and P1172 and the SEL light has been on. The truck runs fine, starts fine, milage is the same, emissions are perfect, but the codes remain. I came across a thread on another forum where a guys truck briefly ran cold and consequently threw the 75/72 codes but he never figured it out.

So, before I start throwing away towards the problem, I wonder if anyone here has any advice beyond the usual "replace MAF and O2's" response. I ask because Im due for a smog-cert here in CA and I've got 30 days to retest.

Ideas?

 

[DeanBrown3D]

These are what the RAVE cd says. (Its in a section that is all about faulty injectors.)

P1175 System too rich (bank 2) Additive injector adaptive fuelling - rich limit exceeded
RH bank

P1172 System too rich (bank1) Additive injector adaptive fuelling - rich limit exceeded
LH bank

I of course have no idea what this means, so hopefully someone smart will come along, but anyway this is what the D2 codes mean.

 

[KyleT]

temp sensor bad from the stop leak, which is the worst thing you can put in a car..... your lucky it didnt clog the block.

 

[MichiganMat]

Ohhh, KyleT... that would do it. I'll take a look tonight, really hope thats whats causing the issue.

 

[MichiganMat]

Temp sensor replaced but Im back with the codes.

Tell me if this is plausible: I believe that corroded battery terminal in my truck caused the electrical system to run a bit *strong*... I came to this conclusion after my clock light burned out twice (finally frying the clock completely) and I went through 2 brake lights, and 2 running lights in the course of a few months.

Im betting the O2 sensors were fed a bit too much current and are now returning overly-rich signals to the computer.

Plausible?

 

[rovercanus]

Temp sensor replaced but Im back with the codes.

Tell me if this is plausible: I believe that corroded battery terminal in my truck caused the electrical system to run a bit *strong*... I came to this conclusion after my clock light burned out twice (finally frying the clock completely) and I went through 2 brake lights, and 2 running lights in the course of a few months.

Im betting the O2 sensors were fed a bit too much current and are now returning overly-rich signals to the computer.

Plausible?

No, the o2 sensors are connected to the ecu. Will the scanner do real time data? If so, watch your o2 sensors, the temp sensor and the MAF sensor. Are they reading ok?
If you suspect excessive current flow (which in itself is flawed thinking) then wouldn't the ecu itself be suspect?
Voltage may be the issue, have you checked what the alternator is putting out?

 

[MichiganMat]

No, the o2 sensors are connected to the ecu. Will the scanner do real time data? If so, watch your o2 sensors, the temp sensor and the MAF sensor. Are they reading ok?
If you suspect excessive current flow (which in itself is flawed thinking) then wouldn't the ecu itself be suspect?
Voltage may be the issue, have you checked what the alternator is putting out?

I do have a scanner, but it doesn't do real-time data unfortunately.

As for the ECU, Im betting it has better voltage regulation built into it than the 02s do, but I can see your point. It looks like testing 02 sensors is pretty trivial, maybe I'll pull them out and give them a test and go from there.