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Old 12-28-2011, 05:43 PM   #23
fdryer
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Join Date: Jan 2006
Location: NYC
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2003 L-Series 3.0L Sedan
Default Re: 2002 SL2 Stalls when coming to a Stop

Although this may seem out of the ordinary except for long haul truck driving, blocking off part of the radiator for winter driving can help retain heat as well as accelerate engine warm up for the very short drive you do. With the engine operating well, blocking off part of the radiator with a well placed piece of plastic cardboard (weather proof) would allow faster warm up while any long drive will allow cold air to flow through the rest of the unblocked portion of the radiator and still have the cooling fan switch on in overheated conditions. Being mindful of this radiator blocking for winter use can help as done by truck drivers knowing how to keep their diesel engines warm on long drives through cold temps.

With a map sensor fault, pulling it to clean out any debris (Q-tip) blocking the little hole used to monitor manifold pressure may help.

Most sensors that are pulled for general cleaning won't upset the pcm - its the same sensor. There are few exceptions; replacing the pcm, bcm, Passlock sensors in the steering column, and removing the pcm fuse. The first three require 'marrying' major components as part of the security recognition process, requiring a 30-minute relearn procedure. The pcm fuse pull resets it back to factory defaults that allows the engine/transmission to relearn engine/xmission customized parameters that come with each driver's way of driving. The parameters are added to the factory defaults as well as taking into consideration the parts that wear out - sort of custom tuning for each engine/xmission for each car to allow maximizing performance/reliability/longevity without the periodic tune-ups from past non EFI engines. Pcm fuse pulling only requires 15 seconds or so to let some electronics drain residual voltage (capacitors). A brake pedal press draws out any retained voltages as the lamps serve as resistors to drain what voltage remains in the electrical circuits.
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