Subject: Re: L98 running cold with 195 stat by toptechx6 on 2008/6/30 9:51:42
Quote:
bogus wrote: Hm... I wonder why your car went into closed sooner? I use the FAST system.
The temp sensor on the waterpump failed. I am assuming it shorted out internally. At about 140F, it would spaz on the digital temp gauge. The numbers would go all over the place... 170, 30, 190, 20, 130, then, once it reach about 150F, it would settle down. If I happened to stop the car during that period, it would simply die. I had to floor it to restart it... most annoying.
It would then set the H15 code.
I'm not familiar with FAST, is it an added computer that just runs the fuel injection or does it replace the factory ECM entirely? That could easily explain the difference I guess, but that temp seems very high to enter closed loop, seems like it would decrease fuel economy. The factory ECM uses a shunt circuit in the coolant temp return signal that switches at about the 140* point you mentioned, have to wonder how the two computers interact if FAST is a separate control for injection and the original ECM communicates with CCM? Does your FAST system still operate the air pump? I imagine that would also affect the transition time to closed loop, just some thoughts on the differences, but it now seems like we are comparing apples and oranges.
