Re: 156 v6 bogging down loses power, around 5k!?
I had same problem with my V6. I must say that It will most probably be your MAF that needs replacing or at least cleaning.
This is not a plug for Ebay, buy I bought a MAF from there. It is still a Bosch item with the same part number. I have since been informed that the reason they are less than half the price is that they are cheap crap from China (where else)
Nevertheless, It works fine, but beware, the fact it works on my car doesn't mean it will work on yours.
After a myriad of problems with my car I have just about got it running as it should now. Best thing to do is get it scanned and, one by one, eliminate the possible causes. They may be something simple you have overlooked.
Let me furnish you with an example. My car started to have a very erratic idle, which got worse when I pushed in the clutch. I scratched my head trying everything at my disposal, including numerous posts to sort it out. I replaced the MAF, Lamda, spark plugs and after countless throttle and ECU resets the result was the same. Yesterday, I managed to fix the problem without even realising it. The MOT is due soon so I replaced the exhaust front section and the back box with second hand items from a breaker. They are in good condition and do not leak. Took the car back from the garage tonight and HEY PRESTO and stable idle, no hunting, no stalling and car revs cleanly upto 7k.
After a scan they next thing I suggest you do is check your complete exhaust system for leaks, particularly the front section that comes down from the front three cylinders. Mine was blowing from there, most probably caused by careless parking up on pavements. Also, the back box was blowing a little. I can only think that the leak was upsetting the Lambda reading.
Sorry to hijack your post but I feel that it is important that the V6 idling/hunting/stalling problem needs addressing and that a solution has been found.
So, the moral of my story is: check your exhaust is leak free because it seems to have a BIG effect on perormance. Anyone who has had the misfortune to be laden with the idling problem will verify that not only it it extremely frustrating, it's dangerous too!