Leaderboard

As an S-Type owner, you'll be aware (I guess) of how sensitive the electronics is to low battery voltage. You'll maybe not know though, what you're expected to do after dis-connecting and re-connecting the battery. I've put together a PDF document which takes you through the procedure step by step. Nothing that isn't readily available elsewhere but just gathered together and (in my view) logically ordered into a single reference. It also includes how to get the audio system working when you don't have the security code I've been asked for it so many times that I though I'd make a thread just for access to that document so here it is:- Battery reset.pdf

I have a 2003 v6 3.0 l s type. I got the dreaded Restricted Performance message come up. At first it seemed to make very little difference to the performance except if I tried to accelerate too fast. I then had to go on a fairly long journey on the motorway and then the warning went away. It later returned the next day and stayed on all journeys of short duration. I started to research the fault and came across a U Tube video which explained all about STFT and LTFT. That is 'short term fuel trim' and 'long term fuel trim'. It explained about how unmetered air getting into the engine will, via the O2 sensors, change the fuel/air ratio. It will first change the STFT and then after time change the LTFT. It's this change that will trigger the Restricted Performance warning. It then went on to explain about how the amount of unmetered air getting in, at low engine speeds, is a high percentage of total air flow but at high engine speeds is a relatively low percentage of total air flow. Thus at higher engine speeds over time, the LTFT will drop and the warning will go away. What I then needed to look for was a relatively small air leak into the engine after the mass air flow sensor. It took about half an hour but I found a small hole in a rubber hose on the idle air system. I replaced the hose and the warning went away. Isn't the interweb thingy wonderful. I hope this helps somebody else sceptic