I have an 05 LS6, after fixing DCCV problem, now I'm having issues with stalling and hesitation. Seems when I hit the gas, I get high RPM's and the car doesn't move anywhere quickly. Originally had cylinder 6 misfire code, replaced plug, coil and boot, still same problem. Next I get a P0430, so I replaced both O2 sensors on drivers side, bank 2, still the same problem. Am thinking of replacing PVC, MAF Sensor and the rest of the plugs, coils and boots. Any suggestions/ideas???? Hoping to fix the problem and avoid the thought of having to replace the CAT. Gas mileage hasn't changed since I first got the car. Please help.

:screwy: Oh, by the way, does anyone know where the PCV and MAF sensor are located. Any diagrams and instructions would be greatly appreciated.
:banghead:

Cylinder #6 is on bank 2, and P0430 points to bank 2 as well. According to the factory service manual, a misfire could cause the P0430 code.

A misfire, however, would not be consistent with how you describe the issue. You mention that the engine RPMs increase but the car does not increase in speed correspondingly. Does the engine speed truly increase? If so, that would point towards a transmission issue in addition to the engine issue.

When you replaced the coil on cylinder number 6, was there oil on the boot? The common oil leak due to valve cover gaskets was supposedly fixed part way through the 2002 model year so it wouldn't be real common for your car to have a valve cover gasket issue, but that's not to say it couldn't. Also keep in mind that a misfire could be due to the fuel injector or compression.

What type of spark plug did you use when you changed the plug? Many modern cars, the LS included, are very sensitive to non-OEM spark plugs. How did the old one look?

-Rod

Hey Shorod, No, there was no oil when I made the cahnges, actually all was dry and fairly clean. I used an OEM plug, trying to keep things to the basics. The old plug, othere that being dirty (burnt kind of), was in good condition overall.

I have actually read in a few places that teh MAF sensor may cause the symptoms I have described, would you agree with this? Anyway, I feel it cant hurt at this point to replace it, I have a little over 60K on my 05 LS6. I will be replacing the MAF, but wouold like to know exactly where it's located and if anyone has any diagrams.:banghead:

The MAF is located in the air intake tubing between the air filter box and the throttle body. Do you have an oiled air filter, or a stock-style paper filter? If the stock filter, and no MAF sensor code, I don't really think that would be your issue. The MAFs are pretty reliable. I have replaced one on a Ford, and that time my vehicle had an "Intermittant MAF" code, I don't recall the code number. Randomly the vehicle (2000 Mercury Mountaineer) would jerk, almost like the engine very momentarily shut off. The it would be fine for several days. If your MAF was bad enough to cause a feeling of a nearly continuous misfire I think it would set a code for a faulty MAF as well. Also, if the MAF were to cause a catalyst efficiency code downstream, I would expect it to be on both banks rather than just bank 2. The MAF is not a cheap part, I wouldn't want to replace it just because it 'could be' the source of the problem.

If you have access to a scan tool that can access the Component Parameters, you might be able to see misfire counts on individual cylinders, even if the counts are not high enough to trigger a diagnostic code.

-Rod

OK, replace all 6 plugs, boots and coils. Seems a little better, but still hesitates slightly. Cleaned MAF Sensor with SRS cleaner, but not much change. Will let you know what happens after I order new sensor and replace.

Well, have done alot of work and still some hesitation under acceleration, but has been driving much better than before. Next, Crankshaft Position Sensor. Let's hope this is it. At least after replacing so many parts, I should be good for a very long time. :runaround: